[ICOM] 751A

[Adam Farson]

Hi John,

In general, as band noise is almost always 10 to 12 db above the receiver's
noise floor, one can insert 9 to 12 dB of RF front-end attenuation to quiet
down the background noise without losing usable sensitivity. There is a note
on this procedure on my website ("dBm from Heaven").

http://www.qsl.net/ab4oj/icom/756pro2noise.html

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of John Geiger
Sent: 20 September 2005 19:18
To: ICOM Reflector
Subject: Re: [ICOM] 751A

I will agree that my 756 original with the preamp off on 20 meters is very
quiet.  The NR helps alot also, but probably not as much as the IF DSP in
the PRO series.  Still seems sensitive enough with the preamp off also.

However, it does seem a little noisy on the lower bands, especially 30 and
40 meters.  Do others who have used this rig actually add 6db or so of
attenuation on the low bands?  It seems more than sensitive enough.

73s John NE0P



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