I removed the CA. The frequency went to 26.9mHz and started climbing about 1k per second. So, it didn’t fix the problem but it did change the frequency.
I replaced it and read voltage on the adder pins, which I’ll post below in a few minutes.
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Galaxy dx99V2 off 4K on various channels
- Thread starter Chris Lawrence
- Start date
I replaced it and read voltage on the adder pins, which I’ll post below in a few minutes.
-IC4-IC5
1) 8-0
2) 7-0
3) 7-8
4) 0-7
5) 8-0
6) 0-7
7) 8-8
8) 0-0
9) 0-8
10) 8-8
11) 8-0
12) 0-0
13) 0-0
14) 8-8
15) 0-7
16) 8-8
26.9mhz on channel 1? I would replace the ca anyways, use some ceramic capacitors.
If removing it caused it to go nearer the expected frequency, and putting it back in causes it to jump up, I believe it's bad.
It's not pretty, but it works fine.
This was in a cobra 2k gtl, but the same idea on the same kinda pll. I used a total of 4 "104" caps to solve an issue like yours, then realign it, see what issues remain.
It's not pretty, but it works fine.
This was in a cobra 2k gtl, but the same idea on the same kinda pll. I used a total of 4 "104" caps to solve an issue like yours, then realign it, see what issues remain.
We
Well, not exactly. When the CA is removed, it doesn’t matter what channel it’s on. The frequency becomes unstable.
Did we at least resolve that the CA isn’t what’s causing some channels to be 4K off frequency? If so, what would be the next thing to check. If not, I’m not sure how to build the array, yet. I can if I need to.
No, I still think it could be suspect. Can I get a better pic, straight above, showing the component you removed?
When measuring the pll pin 15, does it stay low always regardless of channel? Measure while spinning the channel knob. I would like to see all pin readings of the pll on channel 1.
Sorry, I have 5 things going on and I think I confused myself and still thinking it's the 8719 pll, let me look at something while you get pll readings on ch1.
Okay, pin 3 of IC4 should be LOW on CH1 Band E, in order for IC4 pin 12 to go high. We need IC4 pin 12 to be high, so IC4 pin 3 AND pin 4 both being HI will make pin 12 LOW, giving an issue. It, pin 3, is staying HI, when it should be LOW, so either a channel switch or RA102 resistor is open and it is floating HI.
A 47K resistor from IC4 pin 3 to GND would determine if the RA102 is open for that line, or the channel switch is, in fact, faulty.
Yea, I may have done a bad thing here. I think I screwed up early on. This is a 10m radio and I was using a different PLL calc. When I change the 11MHz oscillator to the 15.36MHz and the LO from 7.8 to 10.695, I get this table.
The same P2 commonality exists so not much changes there, except the states of the other pins (which probably threw off Cable Guys values ~ if he was using my chart). Sorry guys. Im going to stare at this chart a little while longer, just be advised that I think my original chart was not valid for this particular radio.
I am pretty sure that you should have this at the PLL (for ch1 26.965MHz)
pin 17 = 1
pin 16 = 1
pin 15 = 0
pin 14 = 1
pin 13 = 1
pin 12 = 0
pin 11 = 1
pin 10 = 0
The same P2 commonality exists so not much changes there, except the states of the other pins (which probably threw off Cable Guys values ~ if he was using my chart). Sorry guys. Im going to stare at this chart a little while longer, just be advised that I think my original chart was not valid for this particular radio.
I am pretty sure that you should have this at the PLL (for ch1 26.965MHz)
pin 17 = 1
pin 16 = 1
pin 15 = 0
pin 14 = 1
pin 13 = 1
pin 12 = 0
pin 11 = 1
pin 10 = 0
Last edited:
Yes, I was taking a shortcut and using the values you listed. Lets see what pll pin values he comes up with.
With the adder values he already gave, pll pins 10, 11 and 14 are opposite what you listed there.
Pin 10 is IC5 pin 13, pin 11 is IC5 pin 12 and pin 14 is IC4 pin 13. Hmm..
Oh, I goofed too, that wasn't a capacitor array, it's another resistor array looking at the correct schematic.
Here’s a better pic. I replaced it after it didn’t result in a fix.
Attachments
D40 is good.
I think I’ve tested about every diode in the area, which probably means nothing because there’s always more.