开云体育

Use of BitX40 for WSJT-X

[email protected] All Messages By This Member #33300 Has anyone success in using the BitX 40 for JT-65? Ted WD4CAV
Joe Puma #33302 开云体育 I am successfully using it with FT8. Using a raspberry pi and wsjt-x. I made PTT with a USB to serial adapter and made a circuit for the RTS signal. Had a little problem because there was some sort of ground leak and the bitx40 ?stayed keyed after the push to talk released but I worked around it and if you use the proper audio interface kit that has a ground isolator you shouldn't have a problem. It's my best use of my bitx so far. I would like to add agc next. It needs it.? Joe KD2NFC? Sent from my iPhone toggle quoted message Show quoted text On Oct 7, 2017, at 7:29 PM, tsalmon534@... wrote: Has anyone success in using the BitX 40 for JT-65? Ted WD4CAV
Larry Smith All Messages By This Member #33303 Only on receive so far. it works really well after I removed C91 and C92 as recommended from other post in this group for USB enhancement. Transmit will take some experimenting.? The heat dissipation is hard on the PA after transmissions.? Check out this group I'm pretty sure others have worked this out for JT65. toggle quoted message Show quoted text On Sat, Oct 7, 2017 at 6:29 PM, <tsalmon534@...> wrote: Has anyone success in using the BitX 40 for JT-65? Ted WD4CAV
Randy W5ZJ All Messages By This Member #33309 Been running FT8 for the last several days with no problems. After about 5 contacts, I'll let the radio "rest" for a little bit. Even with the power reduced, I can feel the heat sink getting warm. The furthest contact was with an EA8. Worked bunches of US stations, and hearing lots of DX.
Randy W5ZJ All Messages By This Member #33310 Ooops...you were asking about JT65. I did make a couple contacts using JT65, but the transmissions are even longer. I had no problems with the contacts I made. It seems to be less crowded.
[email protected] #33317 Yes.? I bought mine specially for working JT65.? I have made many contacts using that mode.? A couple of notes: JT65 runs on USB even on 40 meters - so you need? to use a version of the Raduino software that supports changing sidebands.? A pushbutton has to be added to swap I made a small circuit board with 2? 600/600/ ohm cheap audio transformers to isolate the receive and transmit lines from the computer I also added a VOX circuit on this board - the transmitter is keyed when the software starts sending tones. I limit my output to 2 Watts and have made no changes to the cooling of the BITX final transistor? 73s Greg? KD4VV
[email protected] All Messages By This Member #33318 Thanks to all who have replied to my quesiton. I'd like to eventually convert the BitX40 to a BitX20 and do JT on that band. Ted
Ancel Member Profile All Messages By This Member #33326 I have the bitX40 to build, can u link me to that post for the c91 c92 modification? -- AncelB, MIT EE6002
Karl Heinz Kremer, K5KHK All Messages By This Member #33342 There are a number of posts that talk about this modification. Here is one of them: /g/BITX20/message/30628
Ryan Flowers All Messages By This Member #33343 Not only possible but tons of fun! Highly recommended as a great use of the BITX40. I've done FT8 on 40/30/20 with it and it works well.? -- Ryan Flowers W7RLF ? ?<-- Learn how to go digital on the BITX40
Jerry Gaffke All Messages By This Member #33345 Ryan In this blog post: ? you mention audio oscillations when the volume pot is at a minimum. Maybe you have solved this, that's an old post. ?But if not: Raj has found that the LM386 oscillates when the input pin is at a low impedance, the solution is to add a 1k resistor between the volume pot middle pin and pin 3 of the LM386. /g/BITX20/message/32154 Jerry toggle quoted message Show quoted text On Sun, Oct 8, 2017 at 08:52 pm, Ryan Flowers wrote: ?<-- Learn how to go digital on the BITX40
[email protected] #33351 tsalmon534 I have converted my BITX40 to 20 meters.? I bought the qrp-labs Band Pass Filter and Low Pass Filter for 20 M and replaced the built in ones.? I think I made one change to the Raduino software to swap to 20 meters.? Works great on 20 M.? Definitely??remove C91 and C92?as VFO will be at 19 MHz for 40 Meters USB? and 26 MHz for 20 Meters -? Greg KD4VV
Ancel Member Profile All Messages By This Member #33374 hmm...seems that a DPDT switch as a means to toggle the band and rout the output thru the LPF can make this a Bitx 4020 type system? -- AncelB, MIT EE6002
Daniel Fay All Messages By This Member #33791 Has anyone tried modifying the WSJT-X software to invert the tones so that e.g. JT65 transmissions on LSB are equivalent to ones on USB??? -Dan Fay
Jack Margolis #57365 Greg, Can one just edit the Raduino to change the frequencies from the 40 meter band to the 20 meter band, or do you need a new sketch?
Marc Jones All Messages By This Member #57366 You can just edit it in the sketch . toggle quoted message Show quoted text On Sat, 18 Aug 2018 at 19:59, Jack Margolis <jmargolis9@...> wrote: Greg, Can one just edit the Raduino to change the frequencies from the 40 meter band to the 20 meter band, or do you need a new sketch?

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