[Fwd: LF: Rcvr Sensitivy tests]

[Andre' Kesteloot]

Peter Dodd wrote:

>  Andre' Kesteloot said
>
> > 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
>
> As you will have read in the Low Frequency Receiver chapter of the LF
> Source Book, we have found that receiver sensitivity is often not the
> limiting factor. John, G4GVC, found that the Kenwood TS-850S, with CW
> filters on both IFs, was the best receiver for LF. After hearing of
> John's receiver experimental work I bought a second hand '850 and it
> is the best receiver I have ever used.
> Andre', you appear to have a wide range of receiver equipment so we
> would be interested to see how the TS-850 compares.
>
> --
> Regards, Peter, G3LDO
>
> <g3ldo@zetnet.co.uk>