Hello Doug,
I had a similar problem with a VHF Engineering Transmitter-PA.
Incoming signals would key the repeater but there was no RF output.
First you need to find out if the fault is in the TX or the PA. The
output of the TX
alone should be 1-1.5W. If that's ok, then you should focus on
finding a problem in the PA.
If I remember correctly the way I tested it was by connecting a power
meter to the
output of the TX to see if the output power was ok. I got 1-1.5W as
expected so the
next step was connect a 1W input signal taken from a handheld radio
to the input of the PA.
The output was almost zero.
In my case the fault was with the final transistor (2N 6081). After
replacing it the output was
around 3-4W but after following the tuning procedure described in the
manual it went up to 15W.
You might want to do this first, just in case the low output is due
to a misalignment problem.
Now if the problem is with the TX module... I would check if the
transistors are ok...
You can get all the manuals from the Repeater builder website as pointed out
by Eric.
Hope this helps.
73,
Andreas - 5B8AP
Doug,
The Repeater-Builder site has good info on VHF Engineering equipment. Here
is the PA manual:
<www.repeater-builder.com/vhfe/vhfe-pa-144-220-450.pdf>
73, Eric Lemmon WB6FLY
-----Original Message-----
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Sent: Wednesday, November 07, 2007 2:24 PM
To:
<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] VHF Engineering Tx Help Needed
I have an old VHF Engineering 144 MHz. repeater transmitter that has
very low output. I would like to find someone that has experience
with one of these that can help me trouble shoot it. Any help is
appreciated.
Doug VE7DRF
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