Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Rich,
It has been a while since I had my TR3, but I do remember that a 600 ohm
hand mic I had tried was not good match for the rig. I would guess 2K
ohms would be in the ball park. They were made in the days of high
impedence mics.
As far as getting only a few watts out, how are you measuring that? Most
watt meters I have seen (unless they are peak reading) only show a few
watts of RF on the Drakes while measuring SSB. Drakes are not using
compression, so they have a very large peak to average power ratio. What
that means is that unless the meter is designed to read peak power, it
will show a very low average power. Average power being what most meters
read. My TR7 typically shows about 5 watts on my Drake MN4 watt meter.
And I know that on a peak watt meter I have ~200 watts going out.
One last thing, on AM it will also show low power. Drakes use controlled
carrier AM. That is the carrier changed as you spoke. What that does is
lower the heat on the finals. The TV sweep tubes were designed for high
peak, low average power. If you ran them any other way, you wore them out
very quickly. Ideal for uncompressed SSB service, not so good for other
service.
Hope this helps.
73,
Ron WD8SBB
On Sat, 19 Jan 2008, Rich Carter wrote:
The mic came with the rig. I assume they should work together. The mic
seems to work, but it doesn't have enough drive for the radio. I only get a
couple of watts out for SSB if I yell into the mic. The problem could be in
the rig, but I thought it best to check the mic first. I opened it up.
There's a 4 ohm microphone element and a matching transformer that says BT3
001 on it. I can find no specs for the mic. What is more frustrating is
there appears to be no information about what the drake transceiver wants
for mic impedance. I don't have any matching transformers in my spare parts
bin. Before I run out there and buy some parts, I thought it best to see if
anyone knows what the heck the rig wants.
Thanks for the reply
Rich
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