I am putting together a UHF repeater on 443.775 (+) and acquired a 40
watt (Intermediate) PA deck from an unknown source and started to visually
check it out versus the schematic diagram.
Now, the GE manual (LBI30201) identifies my pa deck as 19D321347G5 Rev
N. This matches the yellow label on the IPA deck. So far so
good. However, the G5 board is listed in the manual as 402-420
and also lists G9 for 420-450 MHz - the same part number except its
a group 9 rather than a group 5 and a different part of the band.
Hmmm. Will I get my 40 watts from this group 5 deck on 443.775??
On the same page of the manual, there is a components change table listed
by frequency band (LL=406-450, L=450-470, M=470-494,
H=494-512).
Whoa there! the (G)roups are 406-420, and 420-450, but the
components don't change between 406 and450?? I scanned the
detailed parts list and found nothing that indicates a difference in
parts between the 406-420 and 420-450 band.
The only discrepancy that I found is that C257 is not
installed on my PA deck and the components table says it should be
there. I checked with my source and all of his 411 MHz PA decks (40 and
100 watt) do not have C257 installed. I'ts a bear
to get at the spot on the PWB for C257. It's right above the
black test socket J5.
The big question is" What am I missing here? What makes UHF
40-watt G5 PAs different that G9's?
Roger Hansen, W6TOZ
Auburn, WA
p.s. the reason that I just didn't try it is that I don't want to fry
anything just yet. Smoke must be
contained!!!!
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