Date   
Re: uBitX low output power, received audio OK #ubitx

KE0GYC
 

Another note:  I am only drawing 1200ma on transmit with full modulation (AAAAH into mic), and after adjusting RV1 it is still around 1300ma.

Listening for BITX on Sunday 7277 kHz

Ken Brown <n4so.ken@...>
 

I am set up on 7277 kHz and listening now for BITX stations on SSB, 3 PM Central time.

Ken N4SO

Virus-free. www.avg.com

Re: Listening for BITX on Sunday 7277 kHz

John P
 

Ken, you should post on the thread with the announcement. Most of us that participate monitor that thread to see who is around. 
--
John - WA2FZW

Re: Listening for BITX on Sunday 7277 kHz

Tom VE3THR
 

are you hearing W5ODJ ? He was on 7.278 and decided to move onto 7.277 and calling CQ VA QSO PTY. Not hearing any BITX stations up hear.
Tom VE3THR

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

On Sun, Mar 18, 2018 at 12:35 pm, Tom VE3THR wrote:
Hey john...what freq you on?
I only spent about 15 minutes o 7227. Heard nothing so I took advantage of the slightly warmer afternoon to cut up all the storm damage from the last 2 nor'easters. Big tree limbs all over the back ya6.
 
--
John - WA2FZW

Re: Listening for BITX on Sunday 7277 kHz

Rick Price
 

W5OJD was splattering all over 7.277 here north of Chattanooga. So, I moved up to 7.278 and had my very first QSO with the ubitx. Virginia to SE TN not bad for 8 watts on a Sunday afternoon.  Rick P KN4AIE



From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Tom VE3THR
Sent: Sunday, March 18, 2018 4:06 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Listening for BITX on Sunday 7277 kHz

are you hearing W5ODJ ? He was on 7.278 and decided to move onto 7.277 and calling CQ VA QSO PTY. Not hearing any BITX stations up hear.
Tom VE3THR

No signals on 7277.00 kHz

Ken Brown <n4so.ken@...>
 

7277 kHz.  No signals at all starting at 3 PM Central time, 2000 UTC. K4FW is below, calling in the VA QSO party.  I should be able to hear TX and VA.

Anyone actually on?

Ken N4SO





Virus-free. www.avg.com

Re: BITX40, are these SA traces as they should be? #bitx40help

Thomas Sharka
 

If you have a cell phone,tablet or even a laptop/desktop then you have an audio generator.





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On Sunday, March 18, 2018 1:41 PM, "news1@..." <news1@...> wrote:


Hi all,

Built my Bitx40, mostly to learn more about troubleshooting radios. I know a bit about measuring and how things "work" but just from reading theory. Practice is clearly different, and a good way to actually get some understanding.
As a result, my setup and measurements may be flawed from the beginning, though I try to do things the "right" way.

As I didn't receive much when trying to listen to the Bitx40 on my TS-870, I started looking at the schematic and trying to figure out what was going on.

Measurement setup:
Bitx40 through 20dB attenuator into a SA. VFO/DDS frequency set at 7110 kHz, no modulation into the microphone (shorted the pins) except for the screenshot with the 10kHz span.

In the 2MHz span, note the strongest peak is at -12dBm around 7333 kHz.
There's another peak around -18dBm at 7110 kHz (which I suppose is the DDS)
Another peak at 7555 kHz, about -41dBm.

In a 10MHz span, I see peaks at 14.218 kHz (-78dBm, obviously harmonic of DDS freq, right?) and 14.445 kHz (-68 dBm, no idea where this comes from).

I don't have a audio freq generator, will build one to inject a know signal into the mic input.

So, a couple of questions:
  1. As the tranceiver uses SSB, shouldn't the carrier be much more suppressed? Ideally, no carrier?
  2. Is the strong peak at 7333 supposed to be there? That's +6dBc, correct?
  3. What's with the 14445kHz peak? There's no peak at/around 7222 kHz...
  4. If I inject a 1kHz signal into the microphone input, what kind of voltage RMS should I use?
  5. A 1kHz on the input should show up as a 7109 kHz signal, is that correct? I tried some "steady" whistling and got a peak at -8 dBc at 7108.4 kHz and another at 7112.1 around -45 dBc (see the 10kHz span screenshot)
  6. In the 10 kHz whistling screenshot, I suppose the signal (result of the whistling) is at 7108.4 kHz, but -8 dBc. Shouldn't this be much more?

I might be missing something obvious, but have been looking a it for a couple of evenings now.

Thank you,

Dieter
ON4DD


Re: BitX40 case from The Home Depot...

Steve
 

Oops.  The Husky cases are polycarbonate, not acrylic.....Aloha, Steve.

uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester.

ge_clipboard
 

Hello Ian

While chasing a dx on 30m found another bug.
When RIT is enabled and then going into the Memory Keyer, one can‘t select a Memory except Nr. 0 as then the RIT-frequency is tuned.

73, Gerald - HB9CEY

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

R S
 

I hear a 10 wattter horizontal loop. Tom. Not sure about call. Here in Ayden, NC.  Things changed here quickly. Station on AM here, up from 7.277

Ron.   KJ4FFG




On Sunday, March 18, 2018, 16:10, John P <j.m.price@...> wrote:

On Sun, Mar 18, 2018 at 12:35 pm, Tom VE3THR wrote:
Hey john...what freq you on?
I only spent about 15 minutes o 7227. Heard nothing so I took advantage of the slightly warmer afternoon to cut up all the storm damage from the last 2 nor'easters. Big tree limbs all over the back ya6.
 
--
John - WA2FZW

Re: Listening for BITX on Sunday 7277 kHz

Vince Loschiavo
 

Thanks Tom VE3THR and Bill NG1P tonight on 7.277 first uBitx contact with other uBitx and bitx40..
Loaded (after some angst) KD8CEC now interfaced with Ham Radio Deluxe. (both ways).
Now has a 3.5in touchscreen Raspberry pi for digital modes on the right hand side of the front panel.
thanks all for the help
de
N2AIE
Vince
Cedar Rapids, IA

#uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

ge_clipboard
 

Hello Ian

While chasing a dx on 30m found another bug.
When RIT is enabled and then going into the Memory Keyer, one can‘t select a Memory except Nr. 0 as then the RIT-frequency is tuned.

73, Gerald - HB9CEY

Sketch Upload Error

Tim Young
 

I am receiving an error when trying to upload the KD8CEC sketch. Please take a look at the attached screen snip jpeg.

Suggestions?

Thanks,

Tim
WB7UVH

Re: uBitx with first mod and question

Richard E Neese
 

you willing to part with 2 of them at 10 bucks a piece plus shipping

Re: Voltage/Waveform chart?

ag4qc38313
 

Um, I also had a Wen gun back in the 50's.  But don't understand what this has to do with my original request.  Back on track, does anyone have a chart/spreadsheet/schematic with voltage/resistance and maybe waveforms from a working radio?  It sure would make things easier when you start to doubt yourself.

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

John P
 

Getting a lot of QRM from a broadcast station on 7275. Going to be on 7278.
--
John - WA2FZW

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

 

I hear some on 7.277 but that nasty AM station is just about to wipe it out

--
David

 N8DAH
Kit-Projects.com

Re: BITX QSO Afternoon/Night, Sunday, March 18, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

 

going to try 7.287
--
David

 N8DAH
Kit-Projects.com

Re: RD16HHF1 power curve flattening...some

Nick VK4PP
 

THanks Glen.

I am making progress, got it working on 80,40,20, but still feedback on 15m, and 10m.
I put 220pf across all 7 emitor resistors. tried with and without, definitly a flatter output with. no effect on the feebback issue.
Changed back to the BN42-202, but a 2:4 ratio winding giving 1:4 transformation. Runs cool at 20+w with 330pf Mica cap. 1K feedback reistor.

80M - 22W
40M - 20W
20m - 18W

I did remove the SSM2167 Mic preamp and the feedback went away, but the mic output was very low... I then put in a MAX9814 mic chip/board via a BS170(same as the TX-POP setup) connected to the T/R line, To mute MIC on RX(DRAIN to GND on mic board..). Worked sortof. Got rid of the feed back, but when exiting TX I got a LOUD pop which causes the uC to reset?!?! so i removed the charge capacitor between GATE and SOURCE, Now the BS170 Switched off straight away, BUT the feedback is back ON TX.

I am thinking that the feedback is being caused by some sort of frequency interaction with the mic preamps and their power supply. Might be related to the TX-POP BS170 that is in the Audio path too...

Basically, the RD16 mods work. BUT when I intorduce any mods to the Mic amp side I start getting feedback. Adjusting RV1 reduced the feedback relative to power. SO I dont thiink I am overdriving the PA. I did try all number of combos of FB resistors and output transformer CAPS, and none made any difference in the feedback issue.
Also of not, is that if i Key CW, not feedback happens. I get full power, 22,20,18,16,14W... So if I can get the FB issue sorted Ill just stick to 20M and below on SSB and use the CW on the upper bands..

So Im thinking of using some inductors(filtering) in series with 5V to the Mic mute, as well as on the D7 pin thats triggering the BS170...

Any other suggestions?

73 Nick.