Hi,

I performed Alison's mod and replaced the 3904’s with 2N2222A T08. I also paralleled the 22 ohm resistors to get the 11 ohms. Not to mention I changed q90 and replaced the resister with 2.55kohms. The 2n2222a’s that have their resistors lowered to 11 ohms get really hot. the other set of drivers that don’t have their resistors lowered ( im not sure why) dont get that hot but they get warm.

when testing amp draw from brown wire in line with amp meter and rv2 and 3 fully clockwise I get 0amp on key up. I turn up one 100ma, then the other. now im at 200ma. If I talk in the mic It swings to 400ma+. With CW key down it jumps to under 1amp.

I am on a dummy load

I dont have a power meter.

Does this make sense after doing that mod. is there a reason why those 2n2222a are getting so hot, can i bring RV1 and 2 up so its drawing more current?


Joe,
KD2NFC

Also, POP fix for earlier boards, and a HPF on RX for BCI option.

On Fri, Mar 29, 2019 at 11:59 AM, Kelly Jack wrote:

Perforations to separate the lpf section for a different location if desired??

I could, But the idea is that is plugs in at the front for the Audio connector and then lines up at the back to sit in the same foot print as the original LPF section.

I will align the mounting holes to use the front right main board hole, and then another 2, with easy to drill locations, I am thinking maybe the GND connector of the original(now unused) antenna connector.
and then a convenient/unused via some where on the other edge....

I have basically done all these mods but as separate boards at this stage, and although it works, I think a single board would be much neater, I did even toy with the idea of integrating my RaduinoI2C boar into it as well... well maybe... maybe not...

If i go ahead an produce these in a large quantity, I will do a proper PDF manual with nice build photos. But it will be a few weeks/months till then, I have an unfinished uBitx here that a very patient gentleman is waiting for to be complete....

73 Nick VK4PP

Yes, there are [Android] audio spectrum analyzer apps that work fine; I'd bet at least a nickel that the Apple Store does as well.

Phillip,
Are we talking about their AGC kit for uBITX?
... Martin

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Thank you. That was exactly my problem. When volume was low the meter was dead. Turn the volume up and meter went up. I ended up putting the audio in for AGC on relay side of R70. But there was still a difference in signal strength from volume low to high. I thought those wires were crossed. You confirmed it.?

--
David

?N8DAH

On Fri, Mar 29, 2019 at 12:19 PM, Nick VK4PP wrote:

HI Everyone.
I'm working on a nice little add-on board for the uBitx.
It contains:
- 200hz CW Filter
- Mic Preamp (SMM2167 Module)
- VK3YE LED AGC
- LPF section (Dual relay per filter)
I will try do it all TH, but the 100uh inductors underneath will need to be 1206 SMT...

Maybe $5 a board + post (VK-$1, DX-$3)

Here is a prototype picture:


73 Nick VK4PP

Nice. I want one. Perforations to separate the lpf section for a different location if desired??

Regards


Simon
VK3ELH

We have added some 3d printed mini mic housing and paddles.

All hardware is included (Mic's use the stock element and tac button that came with your bitx40 or ubitx) you need only solder or glue for magnets on the paddles

We have Red and Black right now and Grey coming soon! If you would like a color and don't see it drop us a mail: info at kit-projects dot com

?

Agc's are still in stock over 100 sold!
--
David

?N8DAH

HI Everyone.
I'm working on a nice little add-on board for the uBitx.
It contains:
- 200hz CW Filter
- Mic Preamp (SMM2167 Module)
- VK3YE LED AGC
- LPF section (Dual relay per filter)
I will try do it all TH, but the 100uh inductors underneath will need to be 1206 SMT...

Maybe $5 a board + post (VK-$1, DX-$3)

Here is a prototype picture:


73 Nick VK4PP

Thanks guys! I'll give it a whirl when I get some more time.??Will see if I can use my tablet.

Trying to fix a problem I pluged the Radunio ?? board into main board ? reversed? and it smoked
I can't seem to find a replacement.

Thanks

Ed

N1AHO

V4 board, Noticed at uncertain times I heard my auto-tuner going in to a crazy auto tune mode and after a bit it would settle down by the time I got from the living room to the rig. It would only do it once or so in a 5 -6 hour time frame. Then now much more often. Suspect was the auto tuner so today after watching it closely while transmitting on 7.074 it would do its thing but each time I notice the freq. monitor on the tuner was fluctuating around 10.?? mhz. Still suspecting the tuner I swapped out to the manual tuner. Tuned and started to do some ft8, but just as before something would stick the ptt line and the meter on the tuner was pegged both ways... ie off freq. (prob. the 10.00 mhz) thing. I noticed I can stop the runaway by doing mike key or cw key causing the relay to cycle and it would resume normal for a shorter and shorter time till it went crazy again. This seem to say it is not the tuner but something going on with the rig. Please all help, suggestions or directions to where to look or do would be appreciated.

well, I tried the BFO at 55.5, tapped around everything on the board pressing down on the leads as best I could. Still no joy. Next I am going to start looking at all the solder joints to see if I come up with something there.?

Yes, would be handy if there was a known good starting point for the BFO.

Thanks for the help, Gary

The best way that I have found to adjust the BFO is to use a free PC based audio spectrum analyzer.? Connect a mic to the audio in on the computer, tune the uBitx to a clear frequency with white noise, and then adjust the BFO to center the signal plot between 500 and 3000 hertz.? This gives the maximum signal and best sounding audio.

Here is the link to the free software:


Note: after adjusting the BFO you may need to go back and recalibrate the dial.? When I did the BFO adjustment on my new v5 board, I had to go back and adjust the calibration for the dial frequency setting.

Above worked for me, YMMV
73
Evan
AC9TU

The next thing that comes to mind is BFO alignment.? Note that the crystal filter has a limited span, and the BFO must be set to that when the output is mixed the received signal is properly mixed down to audio.? This is much easier to do than the frequency calibration procedure, but actually it is more important to function.?

Curt

I have found a wiring error with the amateurradiokits. Its to do with the volume control pot, the black wire must go to the wiper and the brown wire to end hot end. this is more important if you use this to connect to an s-meter.

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I worked on consumer and industrial electronic gear for over 30 years. I have seen unsoldered component leads in TVs, high dollar stereos and commercial equipment. Somehow, the joint didn't get any solder. Somehow, the simple physically-touching connection remained good through board testing, board installation, shipping and end-use installation. Then it worked for a while, sometimes years!

Some years back, Kenwood made a 2m mobile that was notorious for the LCD display loosing contact with the circuit board, resulting in a blank display. NASA had a Mars rover mission fail. When it comes to electronics, *stuff* happens, no matter the price, construction quality, or level of support.

Donald, KB5PWL

Thanks Curt for help. Did some digging around and found cold solder connection (my fault) and fixed that. Now rig is working again but receive is still deft as a post.? WWV is s-9 here but can't hear minute announcements.? If I tune to each side of carrier I can hear that but nothing else. Tried to listen to ssb and can't hear them at all.?Seem to have good audio strength when rig fed with signal generator.? Anyone with any ideas on how to hear well?? Am using ear buds and a Icom mobile speaker.?

When wiring the nano the standard way (not routing the yellow wire from the nextion) do I still need to switch on the signal meter in dsp1? I’m not infront of the radio until tomorrow so can’t test it just yet.?

73s?

Carl M0CLS.