[GreenKeys] CV-483

[Lee Mushel]

Gentlemen:

The possibility of having true dual diversity was what first attracted me to
Flex Radio's software defined products.   I am anxiously awaiting the
arrival of a second receiver for my Flex 5000A.  This should be fun!   You
might want to visit the Flex site to see a current commercial ham product
with the capability.

73

Lee K9WRU
----- Original Message ----- 
From: "Bob McConnell" <rmcconne at lightlink.com>
To: "Larry Tighe" <larryradio at worldnet.att.net>
Cc: <greenKeys at mailman.qth.net>
Sent: Tuesday, May 27, 2008 6:35 PM
Subject: Re: [GreenKeys] CV-483


> Larry Tighe wrote:
> > Got my second CV-483 today from eBay...worked great.  Now to hook it up
> > for diversity.  Looks pretty simple to do.
> >
> > Anyone running a pair in diversity these days?  W1AW comes thru so
> > strong here in NJ on 80 meters, there's seldom a fade.
> >
> > What's the procedure for diversity....receive on 40 and 80 or receive on
> > 80 with two different antennae?  I suspect the latter.
>
> Larry,
>
> I'm stretching the memory cells here, but the basic idea the Navy taught
> me about diversity was to receive the same signal on two frequencies.
> The diversity units actually worked on signal strength. We set all
> receivers' output to 0 dBm, so when one faded, the other would still
> provided clean copy. It was very seldom that both would fade
> simultaneously. Although, if you weren't paying attention, the second
> might fade out after the first was long gone. You could also QSY one
> receiver while the other kept copying the signal. It was standard
> practice to keep two receivers up on the multi-channel broadcasts, which
> were commonly transmitted on five frequencies simultaneously. Diversity
> on single channel signals wasn't as common. Of course, it was relatively
> easy with synthesized receivers locked to a stable frequency standard.
> The R-1051B was the most common HF receiver of that era in the tin-can
> service.
>
> Bob McConnell
> N2SPP
> Ex-RM2, NFIT 1970-74, NLM 74-77
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