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So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Gordon Gibby
Sent: Friday, December 29, 2017 8:21 AM
To: [email protected]
Subject: Re: [BITX20] ALE, WINLINK and uBitX? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
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On Fri, Dec 29, 2017 at 4:05 PM, K9HZ <bill@...> wrote: So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
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hurry Bill :) ?How much room should we leave in the box?? 73 HNY Scott ka9p
In a message dated 12/29/2017 10:05:34 AM Central Standard Time, 9h1avlaw@... writes:
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Bill: Count me in. I have two other ideas. One is a Bluetooth interface for TR.? The other is a spectrum analyzer on the display. Lee, WA9AOE?
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: K9HZ <bill@...> Date: 12/29/17 10:05 (GMT-05:00) Subject: [BITX20] Tuner? Well Sure!
So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
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I have a 138 foot dipole up at 55 feet fed with 450 ohm open wire and find that I can go about anywhere I want to with either one of my Johnson match boxes or a couple of the cheaper mfj tuners. Actually I was surprised as to how well the little mfj tuners work ?
On 29 Dec 2017 9:06 am, "K9HZ" < bill@...> wrote: So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
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I am very interested, please count me in.?
Paul Schumacher K0ZYV
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This is perfect timing... I just started to research DIY automatic tuners. A bunch of inductors, caps, relays and a micro controller to tie it all?together.?
--
Karl Heinz - K5KHK
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On Fri, Dec 29, 2017 at 3:16 PM Karl Heinz Kremer, K5KHK < khk@...> wrote: This is perfect timing... I just started to research DIY automatic tuners. A bunch of inductors, caps, relays and a micro controller to tie it all?together.?
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Karl Heinz - K5KHK
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W2KAP In any given circuit, the most expensive part will always sacrifice itself to protect the fuse.
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Just roughly¡ it will have a foot-print¡ say of an IPhone or a bit bigger¡ and about 1¡± high.? The height limitation of 1¡± is dictated by the Arduino actually.. the rest of the parts are less than ?¡± tall at most. ?If the Arduino is soldered right to the board, it could be thinner but if the Arduino goes south¡ it¡¯s a bear to replace. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Scott McDonald via Groups.Io
Sent: Friday, December 29, 2017 10:43 AM
To: [email protected]
Subject: Re: [BITX20] Tuner? Well Sure! ? hurry Bill :) ?How much room should we leave in the box?? 73 HNY Scott ka9p In a message dated 12/29/2017 10:05:34 AM Central Standard Time, 9h1avlaw@... writes: ? On Fri, Dec 29, 2017 at 4:05 PM, K9HZ <bill@...> wrote: So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency. ? ? ?
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So the Bluetooth add is a clever one too, and here¡¯s why¡ I once had a radio room in a walk-out basement house with a big yard that needed lots of work.? My buddies all wanted to get on and talk during the day time when I should have been working in the yard.? I found a solution, buying a Bluetooth headset with microphone (like something you would use with a cell phone but with real ear pieces that fit over the ears), and a very simple Bluetooth transceiver at the radio plugged into the Mic (receive) and headphones (transmit) jack.? I then use the radio in VOX mode and¡.wow! it worked perfectly.? Got about 75 feet from it crystal clear.? The same device could easily be adapted for T/R.? They are all over Amazon¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Leland Lannoye
Sent: Friday, December 29, 2017 10:50 AM
To: [email protected]
Subject: Re: [BITX20] Tuner? Well Sure!? Count me in. I have two other ideas. One is a Bluetooth interface for TR.? The other is a spectrum analyzer on the display. Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- Date: 12/29/17 10:05 (GMT-05:00) Subject: [BITX20] Tuner? Well Sure! So after finishing up most of my projects a few days ago¡ I really needed something to do¡ so I put on the drawing board¡ a 100w automatic tuner that can work with the uBITx (intended to go inside the same case actually) that provides power, SWR, band memory for same antennas, low power tune, bypass, etc. all in a kit form for about $30.? I¡¯m prototyping the think now and will work on the tuning/communications code (to integrate into the Raduino) shortly.? I¡¯ve contacted a few of you off-channel to work out some protocol/communication issues¡? but Stay tuned (double play on words there)! ??? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? Good pickups! ? So the ALE (automatic link establishment) crowd, much like the WINLINK crowd, tend to use LOTS of bands....and thus they find ways to make their antenna systems work on mulltiple bands.? ?Here are some of the most popular ways: ? 1.? ?Fan Dipoles (time honored technique of tying multiple dipoles together at the CENTER, and the energy tends to go to the correct one, since all the others present much higher impedances.? ?The wires "fan" out with usually wooden spreaders at the? end and some string involved to keep them somewhat separate.? ?Been there done that many times, my college ham club has a 3-band unit up on the top of an 11 story building rightnow that I built for them.? ?Build for yourself, dirt cheap.? ? 2.? Auto-tuners? --- everyone makes these now and many can tune as soon as they see RF, or even return to previous settings that were memorized.? ?LDG,? and others.? ?Low power versions for $100? ?End fed wire to balanced line fed dipoles---they work with lots of different kinds of wire.? ? 3.? Inherently multiband antennas:? ?example, full wavelength loops.? ?Build for yourself.? ? ? 4.? Carefully tuned end-fed transformer-fed antennas --- there are now several of these on the market and they give an acceptable SWR on mulltiple harmonically related bands.? ?Tend to be close to $100 ? 5.? (the one I dislike)? resistively terminated folded dipoles --- these use a resistor to make up for what a folded dipole can't create and give an SWR that is "acceptable" literally across EVERY FREQUENCY in a decade of frequencies.? ?3-30 MHz.? ?The tradeoff is loss, as much as 10 db at times.? And they generally are pricey. ? 6.? There are some multi-band vertical antennas on the market that are basically vertical fan dipoles, but scrunched up in a nice package.? ?An elderly ham in my city has one, 32 feet tall....a gang of us put it up and doggone it does from from 40 meters all the way through 6 meters ? ? And there are probably many more.... ? Gordon
An automatic tuner protects the rig during TX.? If the SWR is bad during TX, some of the signal coming out of the transmitter is reflected by the antenna back into the radio where it can cause damage.
That said, RX is optimized by a properly tuned antenna, but some good amount of signal still makes into the radio when receiving, even when the antenna is not perfect.
So I assume Doc G? is scanning for radio traffic, and then when he finds some if he wants to transmit he does something about his SWR for that frequency.
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I have been wondering about an internal tuner for my uBitx and/or my BITX40¡¯s. This sounds great please count me in on one.. love to see enough inductance to work on 160m also maybe a mod a future design.
thanks Bill ng1p
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If you guys can come up with something that works, it might provide a chance for Asher to provide employment for many many more people.
Remember the most recent MFJ products measure impedance and use smith chart type calculations to predict the solution in jump to it quicker. ??
But that is not at all beyond the capabilities of many on this forum.
Sent from my iPhone
On Dec 29, 2017, at 19:25, bill richardson < ng1p.bill@...> wrote:
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I have been wondering about an internal tuner for my uBitx and/or my BITX40¡¯s. This sounds great please count me in on one.. love to see enough inductance to work on 160m also maybe a mod a future design.
thanks Bill ng1p
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I actually have the schematics for one that I was going to do as a motherboard, replacing the raduino with an arduino, allow for easy migration to a AD9850-DDS module(s), etc, but I haven't pursued it much as my idea is to have a motherboard that would plug in about .55" above the main board (.5 + some tolerance clearance to the inductors).? The bare PCB at 6"x6" is about ~$8.5 from china in qty 10, no clue about the parts, but it would clean up all the external connections - BNC, audio/etc, and allow for pin expansion/etc.? To do all this I would need the board pin locations of the headers on the main PCB.? Haven't gotten that far yet, and if I'm gonna build a prototype, I want the best chance of getting it right.? I have the proven schematic and code already for the tuner from my 50W amplifier kit, along with the SWR bridge.? I'd want to add in a spot for AGC modification as well, which is the one other thing I haven't defined yet.
On Fri, Dec 29, 2017 at 4:36 PM, Gordon Gibby <ggibby@...> wrote:
If you guys can come up with something that works, it might provide a chance for Asher to provide employment for many many more people.
Remember the most recent MFJ products measure impedance and use smith chart type calculations to predict the solution in jump to it quicker. ??
But that is not at all beyond the capabilities of many on this forum.
Sent from my iPhone
On Dec 29, 2017, at 19:25, bill richardson < ng1p.bill@...> wrote:
I have been wondering about an internal tuner for my uBitx and/or my BITX40¡¯s. This sounds great please count me in on one.. love to see enough inductance to work on 160m also maybe a mod a future design.
thanks Bill ng1p
-- Martin Held - AE7EU
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?
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MFJ.? Huh. Glad to see them using science for a change. ? I¡¯m a little old school when it comes to RF design, and particularly with matching circuits like a tuner.? The best tuners I¡¯ve ever owned were military tuners¡ specifically the old Collins 601 and the Harris RF-2601 devices.? If you are a study of these devices you know that the control circuits for the tuners operated essentially transform space with phase and amplitude information to effectively minimize SWR by determining the right transform to make the input see a purely resistive load.? Is that hard to do?? Nope.? You just have to think in a different coordinate system. ?Rather than go into several pages of background here, for those interested¡ there is a wonderful and complete chapter on this very subject in Sabin & Schoenike¡¯s book ¡°Single Sideband Systems and Circuits¡±, Chapter 16.? This book is a must for the serious RF designer.? You can get it off Amazon.? Other chapters in the book will answer questions like why you don¡¯t see grounded gate power amplifiers (a recent topic here), and why the very best IMD and linearity in an RF amplifier comes from a tube design in grounded screen configuration (common in broadcast transmitters¡ the cathode is at minus screen potential!).? Yikes! ? I¡¯ll put together a paper on the various loads the tuner will match once I have all of the calculations done.? Off the top of my head, it should match real impedances of 2ohms-10Kohms and reactances of +/-8Kohms.? I¡¯ve configured the capacitor bank to sit on either side of the inductor to complete the entire transform space (read that work for those really low impedance antennas that are usually not covered by antenna tuners). ? The hardware for me is a breeze¡ what is not so easy for me is figuring out the Raduino side¡ for display and setting¡ like Power, SWR, Bypass, frequency for memories, etc.? I may just build in all these things and ask someone else who is more familiar with the uBITx code to help out.? I have decided to make the tuner an I2C device though¡so that should help with the communications.? I originally was gonna use RS232 (makes it work with a lot of other radios then too¡ and even stand-alone) I2C is better for integration. ? I should have the hardware drawings dome tomorrow¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Gordon Gibby
Sent: Friday, December 29, 2017 6:37 PM
To: [email protected]
Subject: Re: [BITX20] Tuner? Well Sure!? If you guys can come up with something that works, it might provide a chance for Asher to provide employment for many many more people. Remember the most recent MFJ products measure impedance and use smith chart type calculations to predict the solution in jump to it quicker. ?? But that is not at all beyond the capabilities of many on this forum.
On Dec 29, 2017, at 19:25, bill richardson <ng1p.bill@...> wrote:
I have been wondering about an internal tuner for my uBitx and/or my BITX40¡¯s. This sounds great please count me in on one.. love to see enough inductance to work on 160m also maybe a mod a future design.
thanks Bill ng1p
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Just finished building a Kits And Parts (kitsandparts.com) SWR bridge.? Says it's good for up to 100W intermittently.? Probably would accept the 10W from the uBitx w/o a problem.? Designed to output to a pair of current meters, it could be hooked up to analog inputs on the Raduino to read forward and reflected power.
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73 de W5NNH
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I just ordered one and intend to integrate it with my ?BITX. I'll post the results.
Jack, W8TEE
From: John Kemker <kemkerj3@...>
To: [email protected]
Sent: Saturday, December 30, 2017 9:39 AM
Subject: Re: [BITX20] Tuner? Well Sure!
Just finished building a Kits And Parts (kitsandparts.com) SWR bridge.? Says it's good for up to 100W intermittently.? Probably would accept the 10W from the uBitx w/o a problem.? Designed to output to a pair of current meters, it could be hooked up to analog inputs on the Raduino to read forward and reflected power.
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73 de W5NNH
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You can count me in. A 160M addition would encourage more operators to try this band which is also my favourite.
While at it, would it be possible to include 630M?? Although I am not sure that the ¦Ìbitx could be persuaded to tx down there with an additional LPF/BPF it would make more operators try the band.
Couple of quotes from emails.
"I actually changed
the lowest frequency to 100000L. I want to see if 2200M will work, also. My
antenna will never tune to these frequencies, but I want to see if I can hear
anything....?KG5PRT"
"Group,?With a filter front
end and a small preamp I was able to hear a NDB beacon at 209.00KHz with my
Ubitx. the readout read something like 2.09.059...this was a stock UBitx...Hope
this helps! Mike WA3O " So it may be feasible.
Thanks and regards Lawrence
On Sat, Dec 30, 2017 at 9:30 AM, K9HZ <bill@...> wrote: MFJ.? Huh. Glad to see them using science for a change. ? I¡¯m a little old school when it comes to RF design, and particularly with matching circuits like a tuner.? The best tuners I¡¯ve ever owned were military tuners¡ specifically the old Collins 601 and the Harris RF-2601 devices.? If you are a study of these devices you know that the control circuits for the tuners operated essentially transform space with phase and amplitude information to effectively minimize SWR by determining the right transform to make the input see a purely resistive load.? Is that hard to do?? Nope.? You just have to think in a different coordinate system.? Rather than go into several pages of background here, for those interested¡ there is a wonderful and complete chapter on this very subject in Sabin & Schoenike¡¯s book ¡°Single Sideband Systems and Circuits¡±, Chapter 16.? This book is a must for the serious RF designer.? You can get it off Amazon.? Other chapters in the book will answer questions like why you don¡¯t see grounded gate power amplifiers (a recent topic here), and why the very best IMD and linearity in an RF amplifier comes from a tube design in grounded screen configuration (common in broadcast transmitters¡ the cathode is at minus screen potential!).? Yikes! ? I¡¯ll put together a paper on the various loads the tuner will match once I have all of the calculations done.? Off the top of my head, it should match real impedances of 2ohms-10Kohms and reactances of +/-8Kohms.? I¡¯ve configured the capacitor bank to sit on either side of the inductor to complete the entire transform space (read that work for those really low impedance antennas that are usually not covered by antenna tuners). ? The hardware for me is a breeze¡ what is not so easy for me is figuring out the Raduino side¡ for display and setting¡ like Power, SWR, Bypass, frequency for memories, etc.? I may just build in all these things and ask someone else who is more familiar with the uBITx code to help out.? I have decided to make the tuner an I2C device though¡so that should help with the communications.? I originally was gonna use RS232 (makes it work with a lot of other radios then too¡ and even stand-alone) I2C is better for integration. ? I should have the hardware drawings dome tomorrow¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? ? email:? bill@... ? ? If you guys can come up with something that works, it might provide a chance for Asher to provide employment for many many more people. Remember the most recent MFJ products measure impedance and use smith chart type calculations to predict the solution in jump to it quicker. ?? But that is not at all beyond the capabilities of many on this forum.
On Dec 29, 2017, at 19:25, bill richardson <ng1p.bill@...> wrote:
I have been wondering about an internal tuner for my uBitx and/or my BITX40¡¯s. This sounds great please count me in on one.. love to see enough inductance to work on 160m also maybe a mod a future design.
thanks Bill ng1p
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Hfsignals is an enterprise model that is radical. Instead of building more into hfsignala, i would encourage members to try something similar in their own countries and neighbourhoods. Ham radio is small enough a market to not attract big players. ?Low volume, low cost production units are easily organized with small communities. There are smd pick and place machines like th T220 available for a few thousand dollars. Mouser and digikey ship any amount of compoments from around the world for a few dollars. Makers, homebrewers need to grasp this moment and create value. So, take the plunge! Have a great 2018, all. Here is hoping for a better world, f.
On 30 Dec 2017 9:04 pm, "Lawrence Galea" < 9h1avlaw@...> wrote: You can count me in. A 160M addition would encourage more operators to try this band which is also my favourite.
While at it, would it be possible to include 630M?? Although I am not sure that the ¦Ìbitx could be persuaded to tx down there with an additional LPF/BPF it would make more operators try the band.
Couple of quotes from emails.
"I actually changed
the lowest frequency to 100000L. I want to see if 2200M will work, also. My
antenna will never tune to these frequencies, but I want to see if I can hear
anything....?KG5PRT"
"Group,?With a filter front
end and a small preamp I was able to hear a NDB beacon at 209.00KHz with my
Ubitx. the readout read something like 2.09.059...this was a stock UBitx...Hope
this helps! Mike WA3O " So it may be feasible.
Thanks and regards Lawrence
|
?Ashhar, you are so far ahead of people like me that there is no comparison.? ?I went and googled a T220 just to learn what you were talking about.....
The business, design, and manufacturing skills that you have developed are in a class far above what i think most of us will achieve.? ?I do my trade (medicine) fairly well, but I am unlikely to be able to do what YOU are doing.
i would suggest that you might charge a consultant fee to TEACH people what you have learned.? ?I believe you would need a full day or 2 (or more) at your place of business to do that.? ?
There may be others who know this kind of stuff, or other WAYS of doing it, but I'm just floored by the value that you've created.? My niche in life is more on teaching people how to take such technology and put it to emergency communications usage.?
Cheers!!
Gordon
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Hfsignals is an enterprise model that is radical. Instead of building more into hfsignala, i would encourage members to try something similar in their own countries and neighbourhoods. Ham radio is small enough a market to not attract big players.
?Low volume, low cost production units are easily organized with small communities. There are smd pick and place machines like th T220 available for a few thousand dollars. Mouser and digikey ship any amount of compoments from around the world
for a few dollars. Makers, homebrewers need to grasp this moment and create value.
So, take the plunge!
Have a great 2018, all. Here is hoping for a better world, f.
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K9HZ
Leland Lannoye
Art Howard