Drake rated the TR7 by input power as was common then. 250W. They recommended
a fan kit for high duty cycle RTTY operation.
I owned one for years and it was a wonderful radio. The only issue was
tin-plated pins (sound familiar) on the interface between the main circuity and
the digital readout board. Some contact cleaner and massaging the pins after
loosening the mounting screws usually fixed it for another six months or so.
There was no internal provision for split operation, they sold an external VFO.
I built my own.
Wes N7WS
On 1/13/2019 12:14 PM, ab2tc wrote:
Hi again,
True, but the TR7 is all solid state, including the finals. See here:
http://www.wb4hfn.com/DRAKE/DrakeArticles/InsideTheTR7/Inside_The_TR7-01.htm
According to that article Drake claims 130-150W output for bands at above
20m and 60-100W on 80-15m.
Boy, is that transceiver ever jam-packed! Wonder how it does cooling-wise.
AB2TC - Knut
K9MA wrote
On 1/13/2019 12:35, ab2tc wrote:
With typical efficiencies seen in solid state PAs it is probably rated at
no
more than 100W output,
Actually, tube amplifiers can be quite a bit more efficient than solid
state ones. The theoretical limit for class B is around 70 percent, a
practical limit probably around 60. So, the TR7 might put out 150 W.
73,
Scott K9MA
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Scott K9MA
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