开云体育

I have just installed a kit-projects AGC board onto a new V5 board.?
The output can be varied giving a useful gain.
A7 is connected directly to the AGC board.
KD8CEC latest firmware is loaded using a Nextion 3.2E display.
The output figures are lower than expected but the S Meter display works fine.?
Occasionally the S Meter display freezes and takes time to resume. This happens when the tuning step is changed for example.
I am not sure what output capacitor is used on this board or if a discharge resistor is needed to ground?
I would like to hear from others who use this board or from anyone with experience of this problem using other variants of the ND6T board. What levels of output do you get feeding A7?

Thanks in anticipation.
Derek G4VWI.

Hi Derek the device has a bleeder resistor on it already. It is what is selected via the switch and controls the "Decay" time. Have you calibrated the S-Meter display using the ubit configuration manager from KD8CEC? Its possible some values are set weird!

As mentioned in the email from David, Its possible that when you change tune that the firmware is what is also causing the delay, We have no real way to know. I know on my V3 its quite snappy.

-- Tim Keller - KE2GKB

Many thanks for your reply.?
I am trying different settings using KD8CEC manager.
I have made some progress but it is still? a bit sluggish. (I2C update on the cards).
I take it no output should be present with the board grounded and "switched out".
Computer hash does not help when reading values. That is why I asked what values others had measured and used.
Thanks again.
Derek G4VWI

Correct the AGC must be in slow or fast to get a s-meter reading
--
David

?N8DAH

Derek, I had a problem wrth the s-meter sticking when I fist installed the agc board that seems to be resolved since I redid the wiring on the switch.

Did you use the latest instructions when hooking up the switch? The earlier version had a mistake in the wiring dagram.

73, digger AB3XU

my meter on my nextion 3.2 display does that sticky thing sometimes. it did it before i installed the KP AGC board, using the chip-socket mod on the uBitx website, so i think it's just a nextion thing.

I was able to get good levels to calibrate the S meter before i switched to the nextion also, i remember once i switched from the stock LCD it appeared to go a bit lazy. I was using CEC firmware on the stock LCD for a good while, and i never remember it sticking - ok the s-meter was tiny on the 16x2, so i guess i could have missed it sticking to be fair.

Thanks Tim, Digger and David. Your support is much appreciated especially from Kit-Projects.
Digger,I am using a miniature MIL Spec rotary switch for the Kit-Projects AGC board. No problems there.?
Playing with the settings using the memory manager I have got an acceptable response now.

However, I am going to try the last KD8CEC? Nextion firmware to see if that makes a difference. Strange this temporary freeze only happens when the tuning step is changed. I wonder if a second Nano will speed things up?

I used Murata T filters on the power leads and this has killed the motor noise but some mild "motor boating and ticks" can still be heard from the encoder on some frequencies. Have you put added caps on? 7805 input side? Has this made any difference. Or perhaps a separate buck converter from the 12v input. Does that make a difference or not?

Sorting out a new "screened" wire loom for the AGC board and A7 connection now before researching how to set up a second Nano. I am not sure what firmware goes on the second board?

Best wishes Derek G4VWI.

I also see the S-meter sticking sometimes on my V4 with 1.100 software and a Nextion V3 panel, and that happens inconsistently from time to time when executing other options and not just the step change. If I select "Lock" then "unLock" it seems to release something and the meter returns to normal operation , but even that isn't always immediately true. This happened with just using a small audio amp feeding the spare input for an S-meter, which I was able to calibrate pretty well to match other rigs using the Memory Manager table.

Since then I added the second I2C-connected arduino and changed to the DSP meter. The calibration (not available through MM) was pretty far off as installed, so I went into the sketch and modified the level thresholds there and it seems pretty good, now. However, I do have an issue with this 2-processor setup. From time to time, usually when selecting either spectrum or CW decode options, but at least once with neither selected, it will lock the rig in transmit. for example, I might be manually accessing a slider to adjust scan across the band and I get a tone as if a CW key was depressed, but the rig is otherwise unresponsive to inputs until I cycle the power. After turning off and back on again, it returns to normal. I suspect this is just a glitch in the processing, sort of a "Nextion thing" as you describe, but something to watch. It never happened before chaining the second arduino, though.

=Vic=

Thanks Vic. I am not the only one with this issue then. There have been a few other posts on this topic but no conclusions or solutions mentioned.

I am trying different 2.8_E and 3.2_E firmware versions at the moment and will look into reasons for A7 locking up the processor.?
If all else fails I will stick with what I have got. I can read CW up to a good speed so no loss there but it would be nice for demo purposes at the NRC.
Not sure if KD8CEC has ideas on this. Will try to make contact and research further.

Best wishes derek G4VWI.