Rcvr Sensitivy tests

[Andre' Kesteloot]

Some of us performed sensitivity tests various receivers this afternoon.

Basically, we used a HP generator tuned to 136 kHz, connected it to the
receiver under test,  and reduced the generator's output until we could
no longer hear the signal. Not a very scientific test, but good enought
to help us select the receivers we will take with us for the LF
receiving test at Nags Head on 15-18 January

The minimum output power we could reliably measure was -127 dBm into 50
ohms (calibrated against another HP spectrum analyzer)

Rycom 3121 (transistorized)  -106
Icom IC-735    -116
Rycom 2174A (tube type)     -116
Icom IC-720    -126
Cubic (US Navy rcvr)    > -127
NRD 525    > -127 dbm
Icom R-71 A    >-127

73
Andre' N4ICK