Max -
The TR-7 covers 1.5 - 30 MHz without extra crystals, and so covers the
WARC bands, stock. The transmitter is limited to the Ham Bands, but
most units out there have had the "General Coverage" modification
already made.
The receiver has a DBM passive front end, so not quite the sensitivity
of the R-4C, but most all of us are limited by external noise levels
well above the MDS of the TR-7, with the exception of 10M, maybe... The
"block diagram" is quite different, with the '7 having a 48 MHz first IF
before the similar 5.645 MHz IF of the C.
The IF filters are 8 pole crystal filters, same as the C-Line. The PBT
and RIT compensate in large part for the "transceiver syndrome"
limitations, and the RV-7 Remote VFO is a handy accessory, allowing you
to operate "separate" or "transceive" with either PTO.
There have been some improvements, with everything reasonably settled
after the 6-7000 s/n range. SOME units have a click on CW, but simple
mods have been worked out. SOME of the PA "blocks" have a few quirks,
but again mods have been worked out.
The TR-7A started around s/n 10 - 11000, but is identical to the TR-7
with the exception that a 500Hz CW filter and the Noise Blanker were
"standard" on the "A". A resistor was included to enable the AM,
similar to the R-4C, and an extra phono jack was included on the rear
panel as an auxiliary microphone input.
There's probably more, but Jim will cover those..... :-)
All in all, a very nice radio, but it does NOT "glow in the dark" like
the C-Line!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
AirRadio wrote:
Dilemma time... I have been offered a TR-7 but I have to sell my
C-line to make room, now, comparisons, is the TR-7 any better than the
C-line or the same, apart from the normal cosmetic issues (sticky
paint etc) am I going to gain in the rx dept, also any other faults
etc, the TR-7 seems to have a good write up etc though, but so does
the C-line.
73 Max
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