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Yeah, it was a tiny bridged solder gap. Grrr ...
Unit seems to be operating correctly now. I'll very cautiously do any further mods and see what happens.
73, Zack W9SZ
Hi Zack, the flashing green, which is actually flashing red (as the LED is backwards) means the PLL is out of lock. This could be many different things. Check the 10MHz is getting to the synthesiser, measure the VCO tune voltage (pin2 of the synth IC3) should be about 1.3V, do things change when you change channels? , if you can measure it, what RF signal is on the VCO test point.
On Sun, 23 Aug 2020 at 10:15 am, Zack Widup
Yes, thanks. One thing I did was reposition the Murata regulator board so it was parallel to the main board instead of sticking out at right angles. Somehow, in the process, I lost R3 (100k ohms). I just replaced that. There is now 1.1 volts on pin 19. But now, instead of flashing red and green, it is just flashing green. So I got somewhere but I don't know where.
On Sat, Aug 22, 2020 at 6:09 PM MIKE LAVELLE <miclevel@...
try measuring pin 19 on the PIC. maybe the r3/r4 divider is broken. The PIC can't read 12v directly, so r3/r4 scales it down by 1/11 to something that it can read.
Thanks Mike. I measure 12.50 volts going into the board. I measure 12.50 volts going into the Murata regulator and 4.93 volts coming out of that. I measure 4.93 volts going into the 3.3 volt regulator and 3.26 volts coming out. The whole board is drawing about 90 mA. I don't know what is going on.
73, Zack W9SZ
On Sat, Aug 22, 2020 at 5:53 PM MIKE LAVELLE <
For the op notes:
An rapidly alternating RED/GREEN LED flash indicates low DC input voltage. (less than approximately 9.5V). A steady GREEN on the LED indicates RX mode.
The PIC senses this using R3/R4 divider.
I think there is a problem with my unit. I have not done any modifications to it yet. When it starts out, the LED turns on green, then pulses red for just a moment, then goes into an alternating red and green pattern forever. It is not sending CW. It is just an alternating green/red. What does this signify?
73, Zack W9SZ
On Sun, Aug 9, 2020 at 9:02 PM John N9ZL <
If you've corrected the LED orientation (they were installed backwards by accident when manufactured - so reverse the colors if you're looking at a virgin board), then the LED is as follows:
Red on initial power up for a second or two, then it blinks, then stays green.
Green on receive, red on TX.
If you activate the key or the ptt leads, then the led goes red.
If you activate both the key and ptt, then the unit sends CW and blinks the LED with the CW.
In beacon mode, if you're on CH A, it sends CW, if you're on CH B, it sends audio tones over FM. The LED is the same for both.
CH A/B doesn't make a difference for how the LED works.
If you're on FM PTT, then one unit must be on CH A, and the other on CH B.
If you're on CW using the key, then both units must be on the same CH - either A or B.
Again, if you're using the board as it came from China/Australia, the LED colors are reversed from what I have listed here. I took my LED out and flipped it the right way when I installed it in the case.