Re: Is receiver FST3253 signal out amplified before polyphase?
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Is there anything to do about the cw side tone delay? A dit over about 15 wmp it wont even make it to the speaker.
--
Barrett
K5SSO
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Is receiver FST3253 signal out amplified before polyphase?
The receiver manual says the following:
5. Optional Polyphase network module
"...This is because the audio transformer TR1 is fed by the output of the polyphase network module, NOT by
IC5. In fact since IC5 is not used, you do not actually need to install IC4, TR2, or the associated resistors
R1-R8 in the final difference amplifiers (IC5a, IC5b)."
IC4 and IC5 are fed the four quadrature phases from the FST3253.? But, the above paragraph says neither IC4 nor IC5 need to be installed. The receiver schematic does not show how the the four phases get to the polyphase header.
Does this mean the polyphase filter is fed directly from the FST3253, without amplification?
bob-N7SUR
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Re: Strange tuning problem on BitX-40
Initial tests tonight with the quick-and-dirty 470 pf across the bandpass filter and another across one of the output low pass filter toroids to knock down the 2nd harmonic -- method to get unit to work on 80 meters.
(Full disclosure:? ?I have an 80 meter LPF kit to build to add real low pass filtering to the output)
With the 470pf?? across the span of the bandpas filter, the 80 meter band came "alive".
Output (12V to PA) was up around 9 watts with primitive measurement system; measured much more than I see on 40 meters.??
(Both into SWRs < 1.5)
This was just a proof-of-concept test for me, will move to add good lpf.? ?But it looks like it will work, and that means it is a viable kit for local ARES members whom I trying to get to add HF to their handitalkie VHF capabilities....
Gordon
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Hi,
I've made a separate test sketch (raduino_diag.ino, see attached) that tests some basic hardware functions, such as the tuning pot, the switches and the capacitive touch sensors.
The sketch also tests the radio for which mods are installed.
The results are shown on the LCD display.
Additional diagnostic messages are also output to the serial monitor
(in your IDE, use tools => serial monitor, to see them)
73 Allard PE1NWL
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BITX QSO Night, Sunday, November 26, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
BITX QSO Night, Sunday, November 26, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!
This is a worldwide event for BITX40 stations starting at 7pm in each time zone. To participate, call CQ BITX on Sunday, starting at 7pm your local time. The BITX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.
Suggested Best Operating Practices:
Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location.?
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.
Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.
This is an undirected, scheduled event.? The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.? Talk to you then!
--
John - WA2FZW
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Re: Strange tuning problem on BitX-40
Hi,
I've made a separate test sketch (raduino_diag.ino, see attached) that tests some basic hardware functions, such as the tuning pot, the switches and the capacitive touch sensors.
The sketch also tests the radio for which mods are installed.
The results are shown on the LCD display.
Additional diagnostic messages are also output to the serial monitor
(in your IDE, use tools => serial monitor, to see them)
73 Allard PE1NWL
|
Hi,
No problem but: isolate the IRF510 from the heatsink.!!
Rob
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Gracias por tu respuesta. S¨ª me interesa, si me lo env¨ªas, te
estar¨¦ muy agradecido.-
73
?
?
? ? ? He usado una placa Arduino Mega 2560,
una pantalla a Nokia 5110, tres ?encoders mec¨¢nicos y tres pulsadores.
El programa es un desarrollo propio para usar estos
elementos y disponer de un encoder para sinton¨ªa, otro para cambio de bandas y
selecci¨®n de Vfo (5 por banda, independientes), y otro para Rit y selecci¨®n de
paso de sinton¨ªa. Tambi¨¦n tiene posibilidad de ajuste de las frecuencias de BFO
para USB y LSB, as¨ª como de la frecuencia para la segunda FI.
No est¨¢ lo suficientemente bien comentado como para ponerlo
a disposici¨®n general, pero si te interesa, por supuesto te lo env¨ªo.
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Hola
Andres:
Qu¨¦
software has usado en el Raduino?
73 ¨C LU5DNM
?
?
Hello
everyone.
I¡¯m
working on my uBitx project, with my own PCB design.
The
¡°front-end¡± is also different from original.
The
receiver is already working.
If
it can help someone, I have uploaded a video to YouTube with the first
receptions test.
This
is the first version, without Xtal filter for 45MHz.
I¡¯m
using an End Fed antenna for 40, 20 and 10 m. It¡¯s only about 4m above the
ground and between houses, so it¡¯s performance is not the best
or
search for ¡°amh1147¡± on YouTube
|
Hola, Roberto: ? ? ? He usado una placa Arduino Mega 2560, una pantalla a Nokia 5110, tres ?encoders mec¨¢nicos y tres pulsadores. El programa es un desarrollo propio para usar estos elementos y disponer de un encoder para sinton¨ªa, otro para cambio de bandas y selecci¨®n de Vfo (5 por banda, independientes), y otro para Rit y selecci¨®n de paso de sinton¨ªa. Tambi¨¦n tiene posibilidad de ajuste de las frecuencias de BFO para USB y LSB, as¨ª como de la frecuencia para la segunda FI. No est¨¢ lo suficientemente bien comentado como para ponerlo a disposici¨®n general, pero si te interesa, por supuesto te lo env¨ªo.
Saludos
´¡²Ô»å°ù¨¦²õ?
Hola Andres:
Qu¨¦ software has usado en el Raduino?
73 ¨C LU5DNM
?
?
Hello everyone.
I¡¯m working on my uBitx project, with my own PCB design.
The ¡°front-end¡± is also different from original.
The receiver is already working.
If it can help someone, I have uploaded a video to YouTube
with the first receptions test.
This is the first version, without Xtal filter for 45MHz.
I¡¯m using an End Fed antenna for 40, 20 and 10 m. It¡¯s only
about 4m above the ground and between houses, so it¡¯s performance is not the
best
or search for ¡°amh1147¡± on YouTube
|
It is getting harder to find the Type II board. There is confusion on the types, which is why I have a photo in the assembly manual:
Since the article appeared, some eBay vendors are trying to get up to $118 for one! Use the link I gave earlier:
http://www.electrodragon.com/product/ad9850-dds-signal-generator-module/
at $12.50. Or, use the AD9851 and omit D4 and D5 on the AA board and jumper the 5V to the DDS.
Jack, W8TEE
From: "Karl Heinz Kremer, K5KHK" <khk@...>
To: [email protected]
Sent: Thursday, November 23, 2017 11:52 AM
Subject: Re: [BITX20] AD9850 source
Jack,
There is some confusion about the Type I/Type II nomenclature- you are using the terms differently than the PHSNA project and other places online. The way I understand it, the modules you are using - with three rows of pins - ?and that are now getting harder to find are the early ones, and the ones with the two rows of pins, are the current ones. The PHSNA project actually has an adapter board that works both ways: you can use a three row device in a two row layout and vice versa. I am actually using that adapter in the PKAA board successfully. There is some information about the adapter board at the end of this document:?
Thanks for the link and 73 and Happy Thanksgiving?
Karl Heinz - K5KHK? Karl Heinz Kremer PDF Acrobatics Without a Net? PDF Software Development, Training and More...? ? On Nov 23, 2017, at 9:32 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: All: When I wrote the QST article (Nov., 2017), the AD9850 (Type II) was selling for around $10 on eBay. Now, some dealers are asking over $100 for one...ridiculous! I use that board both on the antenna analyzer and the BITX40 TFT/VFO board. One user wrote to me with this source:
They are selling the board for $12.50 and he claims it works perfectly. If anyone is building the AA, you can substitute the AD9851 if you omit D4 and D5 and jumper the 5V line to the chip.
Jack, W8TEE
|
Jack,
There is some confusion about the Type I/Type II nomenclature- you are using the terms differently than the PHSNA project and other places online. The way I understand it, the modules you are using - with three rows of pins - ?and that are now getting harder to find are the early ones, and the ones with the two rows of pins, are the current ones. The PHSNA project actually has an adapter board that works both ways: you can use a three row device in a two row layout and vice versa. I am actually using that adapter in the PKAA board successfully. There is some information about the adapter board at the end of this document:?
Thanks for the link and 73 and Happy Thanksgiving?
Karl Heinz - K5KHK? Karl Heinz Kremer PDF Acrobatics Without a Net? PDF Software Development, Training and More...? ?
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On Nov 23, 2017, at 9:32 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote: All: When I wrote the QST article (Nov., 2017), the AD9850 (Type II) was selling for around $10 on eBay. Now, some dealers are asking over $100 for one...ridiculous! I use that board both on the antenna analyzer and the BITX40 TFT/VFO board. One user wrote to me with this source:
They are selling the board for $12.50 and he claims it works perfectly. If anyone is building the AA, you can substitute the AD9851 if you omit D4 and D5 and jumper the 5V line to the chip.
Jack, W8TEE
|
Hola Andres:
Qu¨¦ software has usado en el Raduino?
73 ¨C LU5DNM
?
?
Hello everyone.
I¡¯m working on my uBitx project, with my own PCB design.
The ¡°front-end¡± is also different from original.
The receiver is already working.
If it can help someone, I have uploaded a video to YouTube
with the first receptions test.
This is the first version, without Xtal filter for 45MHz.
I¡¯m using an End Fed antenna for 40, 20 and 10 m. It¡¯s only
about 4m above the ground and between houses, so it¡¯s performance is not the
best
or search for ¡°amh1147¡± on YouTube
|
All: When I wrote the QST article (Nov., 2017), the AD9850 (Type II) was selling for around $10 on eBay. Now, some dealers are asking over $100 for one...ridiculous! I use that board both on the antenna analyzer and the BITX40 TFT/VFO board. One user wrote to me with this source:
They are selling the board for $12.50 and he claims it works perfectly. If anyone is building the AA, you can substitute the AD9851 if you omit D4 and D5 and jumper the 5V line to the chip.
Jack, W8TEE
|
Hello everyone. I¡¯m working on my uBitx project, with my own PCB design. The ¡°front-end¡± is also different from original. The receiver is already working. If it can help someone, I have uploaded a video to YouTube with the first receptions test. This is the first version, without Xtal filter for 45MHz. I¡¯m using an End Fed antenna for 40, 20 and 10 m. It¡¯s only about 4m above the ground and between houses, so it¡¯s performance is not the best
To watch the Video: ??
or search for ¡°amh1147¡± on YouTube
Regards
EB7ME
|
Re: Strange tuning problem on BitX-40
I believe that one was actually meant for the guy that was getting frustrated with his tuning problem and talking about tossing his BitX in the trash.
Vince.
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On 11/22/2017 10:56 PM, Raj vu2zap wrote: Did not understand you!
At 23/11/2017, you wrote:
I will buy that which you feel is a waste of your time ...gladly pay
for radio and postage. kc7ttt
On Nov 20, 2017 7:04 PM, "Raj vu2zap" <rajendrakumargg@...
<mailto:rajendrakumargg@...>> wrote:
10T pots are not made for heavy usage. I am using 10t in analog
VFO and regular pot in Raduino.
If they show misbehavior then the wire inside started "unwinding"!
Raj _._,_._,_
--
Michigan VHF Corp.
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Re: Strange tuning problem on BitX-40
Did not understand you!
At 23/11/2017, you wrote:
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I will buy that which you feel
is a waste of your time ...gladly pay for radio and postage.
kc7ttt
On Nov 20, 2017 7:04 PM, "Raj vu2zap"
<
rajendrakumargg@...> wrote:
- 10T pots are not made for heavy usage. I am using 10t in analog VFO
and regular pot in Raduino.
- If they show misbehavior then the wire inside started
"unwinding"!
- Raj
|
RF must be getting into tune voltage pot. I had such a problem when the ground wire of the antenna
connector was loose!
Raj
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At 23/11/2017, you wrote: At the bitx40 we built, the BFO frequency varies in the voice signal.
I wonder if it is normal or if someone has ever faced this problem as he did it.
Thank you!
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Re: Filtering noise from Raduino
Awesome! I tried it as well with some parts that just arrived. I used 1000uF capacitors and 1W 15 ohm resistors in a second order RC filter, very similar to the video. All the noise from my power supply and the Raduino are totally gone. Woo!
After the holiday I might try to do a write up for the wiki. This stuff might be common knowledge for most builders, but it sure wasn¡¯t for me :)
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I just watched VK3YE's video and made up the small filter he suggested. I have been trying to reduce the noise on my custom Bitx20 for a while and this small circuit made a huge difference. I attached it between the power supply and the Arduino power input as he suggested and it works really well.
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Re: Is my BitX output stable? (Volume change above 7.200)
Some of the USB cables are only meant for charging,
they don't support data transfer.17
Yes, si5351 drive current can make a difference in how well the signal is received.
But weird it is so different across just the 40m ham band.
Not really sure what firmware version this "factory reset" was getting used on,
but when using Farhan's original Raduino sketch (what comes in the unit when shipped from hfsigs)
the only value stored in EEPROM is the frequency calibration constant.?
Farhan's code leaves the `si5351 drive strength at its default level.
I believe the default drive strength for the etherkit library is 2 mA.?
Jerry, KE7ER
?
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On Wed, Nov 22, 2017 at 05:32 pm, Gene Nitschke wrote:
OK while waiting for the Pixie, I finally got the USB port working again (bad USB cable, go figure!).??
?
So, I started trying different versions of SW to see if I could isolate?the volume issue (increasing significantly after about 7.200 Birdie).? ? Issue is?not there in version 1.04 but present in 1.05!? This is when the VFO drive current was changed to try and eliminate the Birdie!? Going back to 1.27.1 and changing the VFO driver current to 2, 6, or 8 mA eliminates the volume change but makes the overall volume lower,?the birdie is just as strong no matter where I set the current (I verified I was using?Etherkit Si5351 2.0.1).? Maybe I will try the RG174 from VFO to board (as I have lots of that).? ?As the original current was 2mA, I will probably set this unit at that level for now.???I would like to leave this one mainly stock?and start the build on the second unit to hack.
?
While?reading some of the old?threads on the Birdie, I see mention of a "factory reset".? I assume this is the Raduino?? ? Why would you do this and what would?it accomplish?
?
Gene N2IJF
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Re: Is my BitX output stable? (Volume change above 7.200)
Just reread my message and before anyone finds my error, I meant to say with versions 1.04 and 1.05 I ensured I was using??Etherkit
Si5351 2.0.1.? This is not needed in V 1.27.1.
Gene N2IJF
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OK while waiting for the Pixie, I finally got the USB port working again (bad USB cable, go figure!).??
So, I started trying different versions of SW to see if I could isolate?the volume issue (increasing significantly after about 7.200 Birdie).? ? Issue is?not there in version 1.04 but present in 1.05!? This is when the VFO drive current was changed to try
and eliminate the Birdie!? Going back to 1.27.1 and changing the VFO driver current to 2, 6, or 8 mA eliminates the volume change but makes the overall volume lower,?the birdie is just as strong no matter where I set the current (I verified I was using?Etherkit
Si5351 2.0.1).? Maybe I will try the RG174 from VFO to board (as I have lots of that).? ?As the original current was 2mA, I will probably set this unit at that level for now.???I would like to leave this one mainly stock?and start the build on the second
unit to hack.
While?reading some of the old?threads on the Birdie, I see mention of a "factory reset".? I assume this is the Raduino?? ? Why would you do this and what would?it accomplish?
Gene N2IJF
Yup.
Second to the last slide of your document shows the "Chinese Rendition", including the 7.023mhz crystal.
As low as $1.98 on ebay in that link I gave, most are way up there around $3 or so.
And you thought $59 was cheap.
On Mon, Nov 20, 2017 at 09:28 pm, Thomas Sharka wrote:
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w1sye.org
Oscillator Frequency Control Filter The filter elements can be fixed or adjustable. A quartz crystal is ideal as a fixed element. ? Good frequency stability
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This Pixie?
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Allard PE1NWL
Raj vu2zap