Re: End Fed antennas w/ uBITX
#ubitx
Gordon, your summary is spot on.
The appropriate termination value for the 49:1 transformer would be 2450 ohms in order to present a 50 ohm load to the source. The load box used in the ARRL lab would only go as high as 800 ohms. So, in addition to the inaccuracy caused by the mis-termination of the RF Source, the transformer was also operating at a mismatch of 3:1, which would introduce an additional distortion of the results.
WA8TOD
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Re: SI5351 quadrature VFO
Hello Miguel, I have seen the video on you tube and you have done a remarkable job. I am unable to find the sketch on the above link Can you please share the link to me on my email VU3RQX@...73 VU3RQX
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Re: End Fed antennas w/ uBITX
#ubitx
Noticing this thread is taking on the epic proportions of a similar
thread involving baluns on another forum some years ago.? It
resulted in this paper:
Gentleman and lady, write a paper.
Russ Hines
JMS & Associates, Inc.
SBE CSRE
WB8ZCC
--
Reply to: russ@...
On 8/1/2018 9:04 AM, Gordon Gibby
wrote:
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Show quoted text
?Do you know why they didn't use 49*50 ohms as their
termination?? ?
I didn't read the email trail (sorry, just not enough time in
this world) but it seems like you could make a dummmy load for
that if necessary.? ?
What I have gleaned out of all this argumentation
back-and-forth is that these things can have single-digit losses
if working into a resonant piece of wire.? ?And that using a
tuner is preferable. [I always work for lowest losses
personally.]? Some of our newer hams locally are very limited in
their "radio assets".? ?We'll be building uBitx's beginning in a
bout 3 weeks.? We have already built 11 knockoffs of the
Buckmaster off-center fed antenna and I hope to high heaven we
built baluns etc with single-digit losses!!? ?At any rate, it
will be a huge improvement over what most of them had beforehand
(NOTHING HF).? ? Their skills are growing and I've learned a lot
from all the discussions of various "issues" on this forum.? ?
After we get the "stock units" working, hopefully with v4
factory software and setting the oscillator numbers precisely in
the code itself, we will begin on some of the most important
improvements, which I haven't had time to get to quite
yet....one year ago these hams?didn't know a resistor from a
transistor.....
cheers,
gordon
I have been asked by private message what it is about the
QST Review test methodology that I found invalid. I
constructed this explanation of their test in response and I
would like to share it with the group.
The testers used a setup that is used by the ARRL Lab to
test the loss of Antenna Tuners. When testing an Antenna
Tuner the tuner itself converts whatever load is presented
by the "Load Box" back to 50 ohms as a termination for the
RF Source. The inline HP RF Power Meter is working in its
natural 50 ohm domain and should be accurate within the
specification of the meter.
When testing a 49:1 transformer however, there is no way to
adjust the termination to 50 ohms. So, with an 800 ohm load
selected in the load box as the authors specify in the email
trail, the RF Source and the source power meter are
operating in a 16 ohm environment. What the actual power out
of the source is, and what power is indicated on the source
power meter with a 16 ohm load, are determined by the
characteristics of each box. It most certainly cannot be
assumed to be 10 watts. The error in this step can easily be
over 6 dB.
When the test therefore shows the transformer to have a
loss of 0.2 dB, the actual loss could be as much as 6.2 dB.
The two transformer back to back test that I have
documented does not suffer from a load mis-match and is
therefore a far more appropriate way to do this measurement.
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Re: End Fed antennas w/ uBITX
#ubitx
?Do you know why they didn't use 49*50 ohms as their termination?? ?
I didn't read the email trail (sorry, just not enough time in this world) but it seems like you could make a dummmy load for that if necessary.? ?
What I have gleaned out of all this argumentation back-and-forth is that these things can have single-digit losses if working into a resonant piece of wire.? ?And that using a tuner is preferable. [I always work for lowest losses personally.]? Some of our
newer hams locally are very limited in their "radio assets".? ?We'll be building uBitx's beginning in a bout 3 weeks.? We have already built 11 knockoffs of the Buckmaster off-center fed antenna and I hope to high heaven we built baluns etc with single-digit
losses!!? ?At any rate, it will be a huge improvement over what most of them had beforehand (NOTHING HF).? ? Their skills are growing and I've learned a lot from all the discussions of various "issues" on this forum.? ?
After we get the "stock units" working, hopefully with v4 factory software and setting the oscillator numbers precisely in the code itself, we will begin on some of the most important improvements, which I haven't had time to get to quite yet....one year
ago these hams?didn't know a resistor from a transistor.....
cheers,
gordon
toggle quoted message
Show quoted text
I have been asked by private message what it is about the QST Review test methodology that I found invalid. I constructed this explanation of their test in response and I would like to share it with the group.
The testers used a setup that is used by the ARRL Lab to test the loss of Antenna Tuners. When testing an Antenna Tuner the tuner itself converts whatever load is presented by the "Load Box" back to 50 ohms as a termination for the RF Source. The inline HP
RF Power Meter is working in its natural 50 ohm domain and should be accurate within the specification of the meter.
When testing a 49:1 transformer however, there is no way to adjust the termination to 50 ohms. So, with an 800 ohm load selected in the load box as the authors specify in the email trail, the RF Source and the source power meter are operating in a 16 ohm
environment. What the actual power out of the source is, and what power is indicated on the source power meter with a 16 ohm load, are determined by the characteristics of each box. It most certainly cannot be assumed to be 10 watts. The error in this step
can easily be over 6 dB.
When the test therefore shows the transformer to have a loss of 0.2 dB, the actual loss could be as much as 6.2 dB.
The two transformer back to back test that I have documented does not suffer from a load mis-match and is therefore a far more appropriate way to do this measurement.
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Re: End Fed antennas w/ uBITX
#ubitx
I have been asked by private message what it is about the QST Review test methodology that I found invalid. I constructed this explanation of their test in response and I would like to share it with the group.
The testers used a setup that is used by the ARRL Lab to test the loss of Antenna Tuners. When testing an Antenna Tuner the tuner itself converts whatever load is presented by the "Load Box" back to 50 ohms as a termination for the RF Source. The inline HP RF Power Meter is working in its natural 50 ohm domain and should be accurate within the specification of the meter.
When testing a 49:1 transformer however, there is no way to adjust the termination to 50 ohms. So, with an 800 ohm load selected in the load box as the authors specify in the email trail, the RF Source and the source power meter are operating in a 16 ohm environment. What the actual power out of the source is, and what power is indicated on the source power meter with a 16 ohm load, are determined by the characteristics of each box. It most certainly cannot be assumed to be 10 watts. The error in this step can easily be over 6 dB.
When the test therefore shows the transformer to have a loss of 0.2 dB, the actual loss could be as much as 6.2 dB.
The two transformer back to back test that I have documented does not suffer from a load mis-match and is therefore a far more appropriate way to do this measurement.
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New uBITX Raduinos for sale
#ubitx
I have 2 brand new, unused Raduinos from V4 kits of mine that I will never use.? These are the later Raduinos that have the NANO mounted on the backside to keep it from interfering with the display.
They are still wrapped in the original bubble wrap and will include the original display. They are available for $40 each shipped in the US.? International shipping costs $14 to $15 USD and would have to be added for shipping to anyone outside the US.
Interested,? please reply direct to me, not the group to minimize clutter (there's been too much of that lately).? My email address is good on my website (www.w0eb.com) there are links there to email me but it is (use standard email format) w0eb [at] cox dot net.
Jim Sheldon, W0EB
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Re: Anyone with a Raduino for the uBITX version3 for sale?
Hi, Dennis,
Do you have a link for the VF4PLN board?
73,
Paul K2AYZ
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Re: Spurious RF at beginning of CW transmission in the uBitx
This issue of carrier leak on PTT caused by DC flow through the product
detector
seems to be absent in uBitx.
Raj
At 31-07-18, you wrote:
toggle quoted message
Show quoted text
Raj had a nice simple fix for
the carrier burst on the Bitx40,
might be applicable to the uBitx:?
???
/g/BITX20/message/33707
???
/g/BITX20/message/33742
As I recall, there were a half dozen other fixes that worked.
We've already mentioned delays in software as Allard has done for the
Bitx40.
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Re: Spurious RF at beginning of CW transmission in the uBitx
Right Jerry!
First mod I did on the ubit. now when I tune across the bands I hear the relays switching during RX.
Raj
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At 30-07-18, you wrote: I'd be fine with constantly powering the LPF relays on my rig.
And may be the best solution.
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Re: Spurious RF at beginning of CW transmission in the uBitx
Yes, N3GO gets the credits for the good idea!!
Bob N1KW
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Re: ND6T AGC and Click kit wiring notes Gerber files
Thanks for the clarification. My name is Peter
Peter Paul Fox G8HAV
Mid-Cheshire Amateur Radio Society
5 Llandovery Close
Winsford
Cheshire CW7 1NA?
Group Controller
Dane Valley?RAYNET?
Tel: 01606553401 (H)
Tel: 07919315547 (M)
toggle quoted message
Show quoted text
Sorry . your name is? missing - It is hardly surprising that your software cannot import gerbers, which are simply a set of instructions for an industry standard PCB mafr process from the sixties.? Essentially it has to convert a physical layout back into a
schematic.? It has no idea what the active devices were, just their footprints..Imagine a DS board with components mounted both sides. I has to convert that back to a design file at 100 percent accuracy. And some industrial PCBs are laminated up and have say
8 layers. It? would have to convert that back flawlessly.? (Just because someone wanted to reverse engineer something after losing the design file or for Industrial piracy reasons.)
Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To:
"[email protected]" <[email protected]>
Cc:
Sent:
Wed, 1 Aug 2018 08:30:06 +0000
Subject:
Re: [BITX20] ND6T AGC and Click kit wiring notes
Hi, I have been trying to get some software to produce the layout from a Gerber file, but I keep getting companies who will make a PCB from a .Gbr file. Is that the way to go? I use DesignSpark by RS for board design but there is no provision
to import .Gbr. There is provision to export. Thanks
?
Sent from my Windows 10 device
?
Well done Kees and thanks. I agree the moment has come to call "Time". Having the gerbers available will enable others to have boards produced if required, including future group buys.
73
Bill, VK7MX
On 1/08/2018 1:20 AM, Kees T wrote:
A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about 20 AGC boards left from the last EasyEDA board order and about
100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).
The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, I'm going to quit and pass the torch to someone else. Order rates have dropped off some, so maybe everyone who wanted a mini-kit
has one ??
The AGC board and Click board Gerbers have been uploaded to the files section under my call.
"On order" and "shipped" information is available in the "Files" section under my call.
73 Kees K5BCQ
|
Re: ND6T AGC and Click kit wiring notes Gerber files
Sorry . your name is? missing - It is hardly surprising that your software cannot import gerbers, which are simply a set of instructions for an industry standard PCB mafr process from the sixties.? Essentially it has to convert a physical layout back into a schematic.? It has no idea what the active devices were, just their footprints..Imagine a DS board with components mounted both sides. I has to convert that back to a design file at 100 percent accuracy. And some industrial PCBs are laminated up and have say 8 layers. It? would have to convert that back flawlessly.? (Just because someone wanted to reverse engineer something after losing the design file or for Industrial piracy reasons.) Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 CB #2885,?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: "[email protected]" <[email protected]>
Cc:
Sent: Wed, 1 Aug 2018 08:30:06 +0000
Subject: Re: [BITX20] ND6T AGC and Click kit wiring notes
Hi, I have been trying to get some software to produce the layout from a Gerber file, but I keep getting companies who will make a PCB from a .Gbr file. Is that the way to go? I use DesignSpark by RS for board design but there is no provision
to import .Gbr. There is provision to export. Thanks
?
Sent from my Windows 10 device
?
Well done Kees and thanks. I agree the moment has come to call "Time". Having the gerbers available will enable others to have boards produced if required, including future group buys.
73
Bill, VK7MX
On 1/08/2018 1:20 AM, Kees T wrote:
A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about
20 AGC boards left from the last EasyEDA board order and about 100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).
The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, I'm going to quit and pass the torch to someone else. Order rates have dropped off some, so maybe everyone who wanted a mini-kit
has one ??
The AGC board and Click board Gerbers have been uploaded to the files section under my call.
"On order" and "shipped" information is available in the "Files" section under my call.
73 Kees K5BCQ
|
Re: ND6T AGC and Click kit wiring notes
Hi, I have been trying to get some software to produce the layout from a Gerber file, but I keep getting companies who will make a PCB from a .Gbr file. Is that the way to go? I use DesignSpark by RS for board design but there is no provision
to import .Gbr. There is provision to export. Thanks
?
Sent from my Windows 10 device
?
toggle quoted message
Show quoted text
Well done Kees and thanks. I agree the moment has come to call "Time". Having the gerbers available will enable others to have boards produced if required, including future group buys.
73
Bill, VK7MX
On 1/08/2018 1:20 AM, Kees T wrote:
A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about
20 AGC boards left from the last EasyEDA board order and about 100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).
The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, I'm going to quit and pass the torch to someone else. Order rates have dropped off some, so maybe everyone who wanted a mini-kit
has one ??
The AGC board and Click board Gerbers have been uploaded to the files section under my call.
"On order" and "shipped" information is available in the "Files" section under my call.
73 Kees K5BCQ
|
Re: experience with Sunil VU3SUA's enclosures
#ubitx
?
?
?
That link gives some detail, I was particularly interested in the led wiring which is shown here. I also have the connectivity for the rear panel if I can oly find it!
?
?
Trouble is
Eddie to be honest, I find so many different threads and e-mails, I get swamped and do not always conduct my computer filing in decent order.
?
I will find it and send the pic to use for Arduino to usb on the rear panel. Cant find any info on the two jack plugs or 9 pin DSub which is pretty well obsolete now anyway.
?
I dry built mine in the enclosure making sure everything fitted prior to doing any soldering.
?
Hope this helps but am always willing to assist with pictures, the only tricky bit was assembling the display spacers and getting it positioned correctly so nothing is being forced into alignment.
?
My personal e-mail is
ian.radioworkshop@... and would be happy to help
?
Best 73
?
Ian M0IDR
?
Sent from for Windows 10
?
toggle quoted message
Show quoted text
Ian,
Can you point me to the construction record you're referring to in first sentence?? Tnx.
Eddie WA4JXL
|
Richard, I don't know if you could obtain the exact original harness's, but you could make your own if it comes down to it. You could buy the connectors from Mouser/Digikey I suspect, but for the sockets you preferably need a crimping tool or its a bit tedious. There is another way, that I have used:- eBay has header strips and sockets you can cut to length. You can cut them to length and solder wires to them, heat-shrink the solder joint for mechanical strength, then put a bit of hot melt glue over the area.? I have done this many times, pictures are of my adapter cable to fit a Nextion display to a Raduino for example.  
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The connectors are Molex type KK 0.1¡± pitch and are widely available through places like eBay. Available in various number of terminal ¡°ways¡±?
?
The terminals themselves are crimp but I solder them without difficulty and they then click into place.
?
Hope this helps
Ian M0IDR
?
Sent from for Windows 10
?
toggle quoted message
Show quoted text
anyone here know where to get extra wiring harnesses for the ubitx and the bix40 ? we have 3 boards we recovered but no wiring harnesess
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Re: uBitx V4 linearity mod in final audio amplifier
#ubitx
Glad you brought up the CW filter. Very frustrating. Awhile back I built a QRPp rig from Breadboardradio. Com. Great little half-watt transceiver. The other night frustrated with the bandwidth of my UBITx, I thought of the Toothpick CW filter from that rig, so, I hooked it up and it worked great. Couldn¡¯t imagine how much it reduced noise level, and improved CW selectivity. CW filter is absolutely a must.
Ron KI5ADZ
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Re: End Fed antennas w/ uBITX
#ubitx
?Allison sort of off topic? , recent email to you at ARRL addr? re avail of RF Ts in Australasia NOS? as a result of all work done for? Bitx . Definitely not as a Schiller? but you can take it as the latter if you like. :-). Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2?
Telephone Whangarei?? 022? 691 8405
e: Engstr@...
----- Original Message -----
To: <[email protected]>
Cc:
Sent: Tue, 31 Jul 2018 17:20:39 -0700
Subject: Re: [BITX20] End Fed antennas w/ uBITX
I have and disproved your methods, logic and resulting data.
Allison
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Re: uBITX HF transceiver and blue MBITX metal case.
Google 'rar file mac'. Lots of options.
Mark AA7TA
toggle quoted message
Show quoted text
On 7/31/18 7:28 PM, Eddie Esserman wrote: Dear Sunil,
How do we (I, actually, the other good students got it) open the rar file on a mac? ...
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Re: Anyone with a Raduino for the uBITX version3 for sale?
look at the wa6isp board it is a better replacement RaduinoX its worth it .
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Jim Sheldon
Paul Galburt - K2AYZ
Raj vu2zap
Ronald Gratehouse