[Premium-Rx] Ten-Tec RX-340 - Amateur Use

[Henry Kolesnik]

It's clear I'm a little behind.  Can someone please explain the difference 
between a roofing filter and a passband filter and why it's called that? 
Also what' the difference between selectable roofing filters and passband 
tuning?
tnx

73
Hank WD5JFR

----- Original Message ----- 
From: "Cecil Acuff" <chacuff at cableone.net>
To: "Carcia, Francis A HS" <francis.carcia at hs.utc.com>; 
<premium-rx at ml.skirrow.org>
Sent: Tuesday, February 08, 2005 8:13 AM
Subject: Re: [Premium-Rx] Ten-Tec RX-340 - Amateur Use


>I believe the Ten-Tec Orion has implemented multiple, selectable roofing 
>filters.  I would imagine it's in the primary receiver though which I also 
>believe is limited to the Amateur bands only.  I'm not sure the secondary 
>receiver which is General Coverage takes advantage of that technology.
>
> Don't own one though...
>
> Cecil...
> ----- Original Message ----- 
> From: "Carcia, Francis A HS" <francis.carcia at hs.utc.com>
> To: <premium-rx at ml.skirrow.org>
> Sent: Tuesday, February 08, 2005 7:10 AM
> Subject: RE: [Premium-Rx] Ten-Tec RX-340 - Amateur Use
>
>
>>        I find this quite interesting. I think a prepost filter ahead of 
>> the
>> new SDR hardware will be required. The tuned RF stage
>>    in the R390A does a good job of stripping out wide band crud. Multiple
>> Roofing filters is an option no receivers have yet
>>    have a big effect on performance. I still think the SDR needs a stage 
>> of
>> conversion to an IF with multiple roofing filters
>> ahead of the bit bashing. fc
>>
>> -----Original Message-----
>> From: Walter (Volodya) Salmaniw [mailto:salmaniw at shaw.ca]
>> Sent: Monday, February 07, 2005 11:21 PM
>> To: Williams, Barry
>> Cc: premium-rx at ml.skirrow.org
>> Subject: Re: [Premium-Rx] Ten-Tec RX-340 - Amateur Use
>>
>>
>> At 07:20 AM 2/7/2005, you wrote:
>>
>>
>>
>> Before I went any further I wanted to check and see if any of the RX-340
>> owners had tried the receiver on the ham bands, particularly in a CW 
>> pileup.
>> It would also be interesting to see if anyone has used the RX-340 to 
>> listen
>> to a weak AM signal within 10 kHz of a very strong signal.  I did some
>> listening tests with my HF-2050 and it appears to work pretty well, even 
>> in
>> a pileup on 7010.  On the other hand, the filters in the HF-2050 are not
>> very sharp as compared to modern DSP filters.
>>
>>
>> Hi, Barry.  I have a Ten Tec 340, as well as a HF-2050, an Icom 756ProII, 
>> a
>> R390A with a SE-3, and a AOR 7030+ which are often on at the same time, 
>> so
>> A-B-C-D-E testing is possible.  Of all these receivers, (and this is only 
>> my
>> opinion), the Ten Tec performs the worst on MW with a strong adjacent
>> signal.  The MW dxers out there are well aware of this fact and have gone 
>> to
>> some trouble installing roofing filters to correct the poor performance.
>> For the longest time, I A-B'd the 2050 and the 340 and virtually in every
>> instance, the 25 year old 2050 out gunned the 340 by a long shot.  I was 
>> all
>> set to sell the 340, but it's performance on HF is really very good, and
>> with ERGO4 computer control, it's a very nice set up.  The 7030+ is an
>> excellent performer in close, as is the 756, and of course nothing seems 
>> to
>> bother the old Collins R390A.  I know several of my MW colleagues have 
>> added
>> the roofing filter on the 340 which improves the performance markedly, 
>> and
>> they seem very pleased, but at the price of losing the wide audio 
>> bandwidths
>> available in the 340..........Walt.
>>
>>
>
>
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