[R-390] What is the difference between 390 and 390A

[John KA1XC]

Bob,
in addition to what's already been said, for *your* particular BCB DXing
application I would rate the R-390A preferable to the R-390, but not
overwhelmingly so.

The 1st mixer is the first weak link in the RF chain, and the R-390 has two
stages of  gain ahead of it which put a much hotter signal into the mixer
thus decreasing its intermod performance. The reason for 2 RF stages was
image rejection, not sensitivity, and as you know when listening to the BC
band it is full of power house signals that need to be dealt with.

The A's are also much easier to find, fix, and maintain, and it doesn't need
to be a Collins manufacture unless you seek bragging rights.

The sharp mechanical IF filters in the "A" are also excellent for filtering
away adjacent channel signals.

John




----- Original Message ----- 
From: "ROBERT YOUNG" <youngbob53 at msn.com>
To: <r-390 at mailman.qth.net>
Sent: Sunday, April 10, 2005 11:54 PM
Subject: [R-390] What is the difference between 390 and 390A


> Hi,
>
> I'm new here, I'm a BCB dx'er and plan on buying a Collins within the next
> year and was recommended to come here for help by a fellow member of the
> NRC. I'll probably have a lot of questions and my first one is what is the
> difference between the 390 and the 390A? Which would be better for BCB
> DXing? Also I use a nice HQ-180 right now, can anyone compare the two for
> me? thanks,
>
> Bob Young
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>