Message-ID: <16792.200005261012@gemini>
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Organization: University of Hertfordshire
To: rsgb_lf_group@blacksheep.org
Date: Fri, 26 May 2000 11:19:33 +0000
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Subject: LF: Re: AR88D and diversity
In-reply-to: <001701bfc69e$e4a9aa00$0a00a8c0@server1.ThreeLakes.ca>
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Dear LF Group,

Larry wrote:
> Not all AR-88's are the same either.  Some have the 915 kHz IF while
> others have the 455 kHz and I do not remember which have which....
> 
> Larry
> VA3LK

I recently bought an AR88LF receiver - this is more or less the 
same as the AR88D, but with the MF bands replaced with two LF 
bands covering about 73kHz - 540kHz. The IF frequency on this is 
735kHz.

As far as I can see, the "diversity" feature provides for the linking 
of the AGC lines in a number of receivers. In this way, the receiver 
getting the strongest signal effectively mutes the others. Old 
editions of Terman's 'Radio engineering' describe this, saying it 
can be used for polarisation- or space diversity reception on HF.

I intend to try the AR88LF on 136kHz when I have sorted out the 
selectivity switching - somebody seems to have "realigned" the IF 
stages..... Can anybody provide me with a manual for the 'LF 
version? - I only have the 'D manual at the moment. All costs 
reimbursed, of course.

Cheers, Jim Moritz
73 de M0BMU