[NLRS] Deafness on 6M

[Dr. Gerald N. Johnson, electrical engineer]

The RF input of my TenTec 1209 has a rinkydink diode switch. That could
be contributing intermod in the really strong signal area close to a
channel 2 transmitter. Its responsible for making a 1 dB NF transistor
deliver only 7 dB system NF. I think the transverter would work much
better with an external antenna relay and I plan to do that then I hook
it to my new 2m transceiver. The combination of a BF981 double gate
MOSFET and a diode ring mixer (although its home brew, a strong signal
MCL SBL-1H should perform better) should give pretty good strong signal
handling capability. Though 100 KW ERP at channel 2 is a heap stronger
than STRONG! External filtering should help.

We are entering an era where our receivers are going to have to use far
tighter RF selectivity and far better strong signal handling capability
in order to be able to hear the signals that interest us. We may have to
select operating frequencies between the birdies from digital apparatus
and spread spectrum trash on multiple bands.

73, Jerry, K0CQ
-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.