Content-Transfer-Encoding: 8bit
Message-ID: <5.1.0.14.0.20020305111830.00a99f38@gemini.herts.ac.uk>
Date: Tue, 05 Mar 2002 11:58:58 +0000
To: rsgb_lf_group@blacksheep.org
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Subject: Re: LF: Best receiver for LF, and qrss activity.
In-reply-to: <003201c19bd3$5eca3740$4a6152d5@it>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

Dear Giulio, LF Group,

I find the RA1792 generally good on LF - it has a useful selection of 
filters, sensitivity is fairly uniform down to about 15kHz, quite good 
strong signal handling, and it has excellent frequency stability for 
digital modes due to the built in ovened reference oscillator. The main 
down sides for me are the somewhat idiosyncratic front panel controls and 
difficult-to-see LCD display, and a slight leakage around or through the 
filters which means very strong sigs outside the passband are weakly 
audible. It has no preselector whatsoever - just a 30MHz low pass, but then 
most receivers do not have effective preselectors on LF anyway. A tuned TX 
antenna gives adequate preselection, and good sensitivity. There are a 
number of variants with different microprocessor controllers and displays - 
the earlier ones tune in 10Hz steps, while my later one tunes in 1Hz steps. 
My unit has worked fine for over a year now, but some have experienced 
reliability problems - so be sure to get a manual!. I believe on some units 
the LCD displays fail after a while. If it does go wrong, it is relatively 
easy to work on, since it is from before the era of surface mount components.

Cheers, Jim Moritz
73 de M0BMU