Re: Bitx40 varactor tuning/tuning dial?
Do you need a low pass filter between the output of theVFO kit and the Bitx40? Jerry AA1OF/6
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Hi
Please check for a library of practically everything that has ever been written about Huff Puff VFO stabilizers. As well as several practical projects of varying complexity and performance!
73 Hans G0UPL
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Re: Bitx40 varactor tuning/tuning dial?
Hi all
You can also replace the varacter tuned analogue VFO with the QRP Labs Si5351A Synthesized VFO see for $33. The recent firmware changes support the negative IF offset required by the BITX40 and another change to eliminate audible clicks on tuning. The VFO has 10 preset memories and variable tune rate 1Hz, 10Hz, 100Hz etc.
We also have an aluminium case kit available for the Ultimate3S kit but which also fits this VFO see . The case kit includes cut, drilled and silkscreen printed extruded black aluminium enclosure, two toggle switches, two buttons, 9-pin D connector, power socket and matching plug, BNC socket, feet and mounting hardware. The rotary encoder in the VFO kit can be installed in place of one of the buttons (typically the right hand button). I don't know but perhaps even the BITX40 could be fit in the case. The case is 16cm deep and there is plenty of space behind the VFO PCBs but I'm just speculating, I don't know how large the BITX40 board is.
73 Hans G0UPL
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Re: Difference between models?
I think its not being answered because its already been discussed a few times. I have not done it yet, but at least one person has connected it to Q12 emitter side of C43 via a capacitor. Search the archives for Frequency Counter.
--
Bradley Tompkins // K6BCT
________________________________________
From: BITX20@... <BITX20@...> on behalf of r.rking41@... [BITX20] <BITX20@...>
Sent: Saturday, December 3, 2016 9:55:34 AM
To: BITX20@...
Subject: Re: Re: [BITX20] Difference between models?
I've got the same FLL freq counter when I purchased one of their blue cases. I've asked a couple of times but no one has the answer on how to connect it. Didn't know at the time that the BITXV3 had a pinout for DDS. Can anyone help us ?
K1KOB
On 12/03/16, ihc73scout2 ihc73scout2@... [BITX20]<BITX20@...> wrote:
Will the FLL frequency counter he is offering work with the BitX40?
Rich
KC8MWG
Sent via the Samsung Galaxy Express 3, an AT&T 4G LTE smartphone
-------- Original message --------
From: "Richard Knack ihc73scout2@...<mailto:ihc73scout2@...> [BITX20]" <BITX20@...<mailto:BITX20@...>>
Date: 12/3/16 5:37 AM (GMT-05:00)
To: BITX20@...<mailto:BITX20@...>
Subject: Re: [BITX20] Difference between models?
Thanks! [*<):) cowboy]
Rich
KC8MWG
On Friday, December 2, 2016 9:44 PM, "Ashhar Farhan farhanbox@...<mailto:farhanbox@...> [BITX20]" <BITX20@...<mailto:BITX20@...>> wrote:
the hfsigs model is called bitx40v3. it is available only on the website at www.hfsigs.com<>. it is a fully assembled and working board.
the two you mentioned are the kits sold by sunil lakhani. they are an excellent kit already assembled by thousands of us.
- f
On 03-Dec-2016 4:27 am, "Richard Knack ihc73scout2@...<mailto:ihc73scout2@...> [BITX20]" <BITX20@...<mailto:BITX20@...>> wrote:
Out of idle curiosity, I looked up BitX on EBay, and saw references to two models: 3B and 3C. What are the differences between the two? And which model is the one available from HFSigs?
Rich
KC8MWG
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Re: Narrow bandwidth filter
On 3.12.2016. 20:19, caulktel@... [BITX20] wrote: If my ears are accurate, I would say the crystal filter is about 2 to
2.3KHz wide on the BitX40. I'm not complaining, it seems to be quite
sharp and sounds crisp and clear on a normal 2.7KHz or less signal, but
when listening to a station that is wide like 3 to 4KHz or more, (yes,
they are out there), the audio distorts very easily because most of the
signal is outside of the crystal filters bandpass. I watch some of these
guys on a SDR receiver and they are way too wide and driving way too
much audio. This is just an observation, not a complaint, I love the
BitX40 and it's simplicity. BTW, another BitX40 sounds great on my radio:-) Those guys are well out of specs so I would not bother. Pedja YT9TP
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If my ears are accurate, I would say the crystal filter is about 2 to 2.3KHz wide on the BitX40. I'm not complaining, it seems to be quite sharp and sounds crisp and clear on a normal 2.7KHz or less signal, but when listening to a station that is wide like 3 to 4KHz or more, (yes, they are out there), the audio distorts very easily because most of the signal is outside of the crystal filters bandpass. I watch some of these guys on a SDR receiver and they are way too wide and driving way too much audio. This is just an observation, not a complaint, I love the BitX40 and it's simplicity. BTW, another BitX40 sounds great on my radio:-) Joel KB6QVI
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Re: Difference between models?
?I've got the same FLL freq counter when I purchased one of their blue cases. ?I've asked a couple of times but no one has the answer on how to connect it. Didn't know at the time that the BITXV3 had a pinout for DDS.? Can anyone help us ? K1KOB ? ? On 12/03/16, ihc73scout2 ihc73scout2@... [BITX20] wrote:? ? Will the FLL frequency counter he is offering work with the BitX40?
Rich KC8MWG
Sent via the Samsung Galaxy Express 3, an AT&T 4G LTE smartphone
-------- Original message -------- Date: 12/3/16 5:37 AM (GMT-05:00) Subject: Re: [BITX20] Difference between models?
Thanks! 
Rich KC8MWG
? the hfsigs model is called bitx40v3. it is available only on the website at . it is a fully assembled and working board. the two you mentioned are the kits sold by sunil lakhani. they are an excellent kit already assembled by thousands of us.? - f
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Re: 7.285 is the QRP SSB calling frequency
Rich,
Just turn the drive level pot that is by the heat sink down until you get 5 watts out.
Joel KB6QVI
toggle quoted message
Show quoted text
On Dec 3, 2016, at 3:03 AM, Bill Meara n2cqr@... [BITX20] < BITX20@...> wrote:
?
Rich:? I think if you just backed off the mic a bit you'd be fine.?? Or you could build a resistive pad to knock the signal from the BITX ?down a couple db.? But I don't think that is necessary. ? 73? Bill
?
Slightly O.T., but I am wondering - is there a way to reduce the output power on the BitX40 from 7 watts to 5 watts? I have a Chinese 45 watt amplifier I originally bought to go with the mcHF self-contained SDR I am building, and the amplifier is 5 watts maximum input (the mcHF can be reduced to 5 watts or even lower in the on-screen menu).
Rich KC8MWG
?
I made contact with WA3O in Pittsburgh last night on 7.285 last night around 8 pm EST (0100 Z).? BITX 40 Modules on both ends, but Mike was running his to an amplifier and I?had 25 volts on the?IRF510, so it wasn't QRP....??? We should definitely encourage use of 7.285 as a calling freq for these rigs. 73? Bill N2CQR? (Falls?Church, Va.) ?
On Friday, December 2, 2016 7:58 PM, "Bill Kittilson bill@... [BITX20]" <BITX20@...> wrote:
?
Heard no one?
?
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
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Re: Handheld Radioshack mike for BITX
Chris,
Here is the schematic,
----------
Joel KB6QVI
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On Dec 2, 2016, at 9:28 PM, Chris Waldrup kd4pbj@... [BITX20] <BITX20@...> wrote:
21-1834
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Re: Difference between models?
Will the FLL frequency counter he is offering work with the BitX40?
Rich KC8MWG
Sent via the Samsung Galaxy Express 3, an AT&T 4G LTE smartphone
toggle quoted message
Show quoted text
-------- Original message -------- From: "Richard Knack ihc73scout2@... [BITX20]" <BITX20@...> Date: 12/3/16 5:37 AM (GMT-05:00) To: BITX20@... Subject: Re: [BITX20] Difference between models?
Thanks!
Rich KC8MWG
On Friday, December 2, 2016 9:44 PM, "Ashhar Farhan farhanbox@... [BITX20]" <BITX20@...> wrote:
?
the hfsigs model is called bitx40v3. it is available only on the website at . it is a fully assembled and working board. the two you mentioned are the kits sold by sunil lakhani. they are an excellent kit already assembled by thousands of us.? - f
|
Re: 7.285 is the QRP SSB calling frequency
Rich:? I think if you just backed off the mic a bit you'd be fine.?? Or you could build a resistive pad to knock the signal from the BITX ?down a couple db.? But I don't think that is necessary. ? 73? Bill
On Saturday, December 3, 2016 5:41 AM, "Richard Knack ihc73scout2@... [BITX20]" wrote:
?
Slightly O.T., but I am wondering - is there a way to reduce the output power on the BitX40 from 7 watts to 5 watts? I have a Chinese 45 watt amplifier I originally bought to go with the mcHF self-contained SDR I am building, and the amplifier is 5 watts maximum input (the mcHF can be reduced to 5 watts or even lower in the on-screen menu).
Rich KC8MWG
On Saturday, December 3, 2016 5:36 AM, "Bill Meara n2cqr@... [BITX20]" wrote:
?
I made contact with WA3O in Pittsburgh last night on 7.285 last night around 8 pm EST (0100 Z).? BITX 40 Modules on both ends, but Mike was running his to an amplifier and I?had 25 volts on the?IRF510, so it wasn't QRP....??? We should definitely encourage use of 7.285 as a calling freq for these rigs. 73? Bill N2CQR? (Falls?Church, Va.) ?
On Friday, December 2, 2016 7:58 PM, "Bill Kittilson bill@... [BITX20]" wrote:
?
Heard no one?
?
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
Re: 7.285 is the QRP SSB calling frequency
Slightly O.T., but I am wondering - is there a way to reduce the output power on the BitX40 from 7 watts to 5 watts? I have a Chinese 45 watt amplifier I originally bought to go with the mcHF self-contained SDR I am building, and the amplifier is 5 watts maximum input (the mcHF can be reduced to 5 watts or even lower in the on-screen menu).
Rich KC8MWG
On Saturday, December 3, 2016 5:36 AM, "Bill Meara n2cqr@... [BITX20]" wrote:
?
I made contact with WA3O in Pittsburgh last night on 7.285 last night around 8 pm EST (0100 Z).? BITX 40 Modules on both ends, but Mike was running his to an amplifier and I?had 25 volts on the?IRF510, so it wasn't QRP....??? We should definitely encourage use of 7.285 as a calling freq for these rigs. 73? Bill N2CQR? (Falls?Church, Va.) ?
On Friday, December 2, 2016 7:58 PM, "Bill Kittilson bill@... [BITX20]" wrote:
?
Heard no one?
?
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
Re: Difference between models?
Thanks!
Rich KC8MWG
On Friday, December 2, 2016 9:44 PM, "Ashhar Farhan farhanbox@... [BITX20]" wrote:
?
the hfsigs model is called bitx40v3. it is available only on the website at . it is a fully assembled and working board. the two you mentioned are the kits sold by sunil lakhani. they are an excellent kit already assembled by thousands of us.? - f
|
Re: 7.285 is the QRP SSB calling frequency
I made contact with WA3O in Pittsburgh last night on 7.285 last night around 8 pm EST (0100 Z).? BITX 40 Modules on both ends, but Mike was running his to an amplifier and I?had 25 volts on the?IRF510, so it wasn't QRP....??? We should definitely encourage use of 7.285 as a calling freq for these rigs. 73? Bill N2CQR? (Falls?Church, Va.) ?
On Friday, December 2, 2016 7:58 PM, "Bill Kittilson bill@... [BITX20]" wrote:
On Dec 2, 2016, at 7:41 PM, Joel Caulkins caulktel@... [BITX20] < BITX20@...> wrote:
?
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
Handheld Radioshack mike for BITX
Hi,
I am getting my BITX40 SMT kit boxed up. Thanks Farhan for the incredibly low price for a good product.? I have a Radio Shack hand microphone/speaker, part number 21-1834.? It has a connector with two side by side two conductor plugs. One is a 3.5mm and the other a 2.5mm plug. I ohmed out the 3.5mm and it is 8 ohms so that one is known. The other one must be a mic but I don't understand the PTT on this unless it just is in series with the microphone element I did confirm from the data sheet that it is an electret element. I could understand if the 2.5mm was three conductor.? Has anyone used one of these with the kit and if so how did you manage to wire it.? Thanks.?
Chris KD4PBJ?
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Re: Difference between models?
the hfsigs model is called bitx40v3. it is available only on the website at . it is a fully assembled and working board. the two you mentioned are the kits sold by sunil lakhani. they are an excellent kit already assembled by thousands of us.? - f
On 03-Dec-2016 4:27 am, "Richard Knack ihc73scout2@... [BITX20]" < BITX20@...> wrote:
?
Out of idle curiosity, I looked up BitX on EBay, and saw references to two models: 3B and 3C. What are the differences between the two? And which model is the one available from HFSigs?
Rich KC8MWG
|
Re: Bitx40 varactor tuning/tuning dial?
Jack and All I bought a kit from Farruk(sp) a few months ago. I just put it together last night for my Bitx40. I found I do not have the I2C interface for the displays in my collection, so ordered a proper display just now. This will be my first Arduino experience. I know absolutely nothing. I think this will be a great addition to the Bitx40.? You will probably be hearing from me on the other list. I’m sure I’ll run into some snags. Mark K3MRK ? ?
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From: BITX20@... [mailto:BITX20@...]
Sent: Friday, December 02, 2016 8:41 AM
To: BITX20@...
Subject: Re: [BITX20] Bitx40 varactor tuning/tuning dial?? ? The SoftwareControlledHamRadio group was formed in response to our March, 2016, QST article on the Forty-9er, a rig that was originally designed by Wayne Burdick (now Elecraft) and Doug Hendricks (QRPGuys.com) as a project for the NorCal group back in the 1990's. You can download details on the PCB, assembly manual, and software at: I don't know if Farrukh still has boards left, but this really isn't an ad as I don't make enough from this to let the XYL SuperSize her meal once a month. We really did it to try and get more hams using microcontrollers in their projects. You can get more info on the Users Group at: | 
| Yahoo! Groups | |
|
|
From: "Will Kimber zl1tao@... [BITX20]" <BITX20@...>
To: BITX20@...
Sent: Friday, December 2, 2016 12:58 AM
Subject: Re: [BITX20] Bitx40 varactor tuning/tuning dial? ? ? SoftwareControlledHamRadio Which is doing an almost identical transceiver idea using AD9850 and Nano? but based on cheap chinese 49'er kits.? You can use their software for your Arduino of what ever type you use. ? ? Re.? making your own Arduino based digital dial. A good place to start is with on-line documentation for the Arduino boards and for the IDE (Integrated Development Environment) or code editor.
Code for Arduino is written in C++ with a built-in arduino.h abstraction layer that provides mostly universal pin designators and built-in functions between most of the several Arduino boards.? Code for Arduino systems is called "sketches" with many already built applications being available via on-line searches as C++ source code with file name suffixes of ".ino". My own preference is the Arduino NANO Mega-328 from any of several Ebay
vendors. Its size is small for the performance it provides.? Yes, Ebay imparts
some level of caution but to-date my boards seem to work as advertised.?
I have changed the 16 MHz crystal resonator to a 20 MHz crystal with positive
results.?
? ?
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Re: 7.285 is the QRP SSB calling frequency
toggle quoted message
Show quoted text
On Dec 2, 2016, at 7:41 PM, Joel Caulkins caulktel@... [BITX20] < BITX20@...> wrote:
?
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
Re: 7.285 is the QRP SSB calling frequency
Made one contact and heard another that had distorted audio. Joel Caulkins KB6QVI
toggle quoted message
Show quoted text
On Dec 2, 2016, at 4:12 PM, Bill Kittilson bill@... [BITX20] < BITX20@...> wrote:
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
Re: 7.285 is the QRP SSB calling frequency
I just worked W0MNE, Mike in Boise ID. He was on his BitX40, Ya! It worked. Joel Caulkins KB6QVI
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Show quoted text
On Dec 2, 2016, at 4:12 PM, Bill Kittilson bill@... [BITX20] < BITX20@...> wrote:
?
Ok listening around 730 again tonight. ?
?
I listened and called CQ, but didn't hear a peep. Joel Caulkins KB6QVI
?
I'll be listening @730. QTH Levittown PA
N3JHS
?
7.285 is the QRP SSB calling frequency.? It takes a little bit of tuning to adjust the BITX to that frequency. ?
I will be looking for other Bitx operators at 7:30 PM eastern, 00:30 zulu.
Joe W3TTT
|
YT9TP - Pedja
Joel Caulkins/N6ALT