On 10/3/2014 6:32 AM, Rick - DJ0IP / NJ0IP wrote:
The TR7 was a single conversion receiver and excellent in its time.
No, it's not sigle conversion.
The TR7 had two IF's. The it's 7am and I have not my morning coffee, so
I'm rounding, but the first was around 48mHz and the second around 5.
Probably the reason you think so was there were no optional filters for
the 48mHz IF.
The TR7 had a roofing filter about 9kHz, and included a 2.3kHz filter
which was used for transmitting and receiving. It had 3 optional filter
slots, with 1.8kHz, 500Hz, 300Hz and 6kHz (am receive) available from Drake.
A third party (International Crystal?) sold a 4kHz AM filter and the
TR-7A came with a resistor in place of one of the filters giving you the
9kHz bandwidth for AM reception.
There is a mod floating around to use the 6kHz crystal for AM transmission.
If anyone cares lt me know and I'll get the exact details.
http://www.wb4hfn.com/DRAKE/DrakeArticles/InsideTheTR7/Inside_The_TR7-01.htm
http://www.wb4hfn.com/DRAKE/DrakeCatalogsBrochures/Brochure_TR7.htm
Geoff.
--
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|