[Premium-Rx] Premium-Rx Digest, Vol 86, Issue 1

[Ed]

Did the US Military really use the R390 in the 1990s?  I heard that was a myth, as was the storyline about older intercept operators using boat anchors at the NSA.  Maybe Snowden can tell us Lol. 

Sent from my iPhone

> On Jan 1, 2014, at 7:49, "Michael O'Beirne" <michaelob666 at ntlworld.com> wrote:
> 
> Dan,
> 
> I suspect the problem is not that different from the very high QRM encountered in the recent desert campaigns and caused by the very high static levels.  You may recall in the First Iraq campaign that US Forces had to dig out their old Collins R390As to cope.
> 
> I also suspect the answer in part is to add a decent tunable preselector to the input to reduce the broadband noise, and also to fit a better mains power filter.
> 
> I recall being told by a professional communicator at Air Traffic Control at a major UK computer centre that they used an old Eddystone EC958 to monitor some of the Atlantic HF channels.  They replaced it with a modern receiver with a wide open F/E and it was hopeless, probably smothered by the vast local QRM generated by the computers.  The 958 in contrast hasd three very sharp tuned circuits before the mixer and was able to cope better.
> 
> 73s
> Michael
> G8MOB
> 
> ----- Original Message ----- From: "Dan Robinson" <dxace1 at gmail.com>
> To: <premium-rx at mailman.qth.net>
> Sent: Wednesday, January 01, 2014 2:54 PM
> Subject: Re: [Premium-Rx] Premium-Rx Digest, Vol 86, Issue 1
> 
> 
>> I have had my 340 for three years now -- it's obviously among
>> the top of the pile when it comes to receivers.  But one thing I
>> have noticed is that it does not hold up well in noisy receiving
>> locations, likely due to its construction in comparison with the
>> older boatanchor weight receivers.  Comparisons with my 8718A/MFP
>> at my house, which frustratingly has been plagued by a lot of power
>> and DSL noise, show that 8718A, which is built like an Abrams tank,
>> manages to rescue signals better than the 340 on days when local
>> noise is high.
> 
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