I decided to look at the A9 RF out board today. What I find,
First, it is not like most I have seen, it does not use the H1 part in the signal path. I have the 1GM14201 amplifier. It seems to be working unless there is a failure mode that allows it to be bad in just a frequency range ( @ 250MHz to 500MHz is off ). Anywhere else I can get 13dBm. The 4432B is rated for 10dBm at 3GHz, but I seem to be able to get 12.5 reliably. Makes me think the amp is OK, but could be wrong. I need to look at the block diagrams and see if different frequency ranges have different preamp paths. When I get to the frequencies the level is bad, it hits a wall. If I have 10dBm set then switch from 240MHz to 250MHz, the output drops to 0dBm. If I set the output to 0dBm, the unlevel goes away
U772 or U771? ( maybe a small VR ) is not mounted to board but glued to the top of an IC and wired to the board pads. It looks like a factory rework, maybe an ECN to use a slightly bigger part ( deliver more current ), though not having the board for a heat sink seems bad.
Theres an LM393 that has two pins lifted and one of the inputs wire to an input on the other side. Again, looks like a factory kludge. Looking at the layout, one comparator was not used but the layout shorted both inputs and the output to ground. They left one input grounded and wired the other input to one of the other comparators inputs. So fine, no issue ( other that there are many layout errors in this system ).
I find a red LED lit on my UND board, need to see if I can find info on what all the LEDs are.
There are 5 green LEDs on the fuzzy board, two go out when the system is finished booting.
Other things I have noticed, I get an unlevel message even though the output is where it's set to ( within .2 dBm ) other frequencies with the same offset are fine.
I also turned ALC off and ran a power search on a frequency that the level was OK on and it failed. Not sure why.
This unit is turning out to be a little more work than I wanted, but I'll likely learn a few things along the way.
In anticipation of fixing an unlevel issue and thinking I would find H1s in there, I bought some. Some how doubt the are genuine, but they still might be good. I expect them here in a couple days. If you need some, let me know.