Ladder and Cohn IF filters are easily made with 6-8 common HC-6 or HC-49S
crystals. In production quantiles, these should be no more expensive than
the original Ten Tec IF filters modules.
https://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2009/QEX_Nov-Dec_09_F
eature.pdf
Paul, W9AC
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Bwana Bob
Sent: Sunday, November 27, 2016 10:32 PM
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] On the Corsair II revival idea and receiver noise
There is another problem with crystal and mechanical filters:
Availability. Collins recently discontinued their filter line. With the DSP
revolution ongoing, analog filters will become even more expensive.
One of the filters in my Paragon went bad with high insertion loss, and I
bought a replacement from INRAD.
73,
Bib WB2VUF
On 11/24/2016 6:25 AM, rick@dj0ip.de wrote:
> Even if it equaled the K3 performance, it would be outstanding.
> But the problem is and remains Xtal Filters.
> We'll need 6, maybe 8 of them and we'll be lucky if they are priced
> under
> $100 each.
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt, Germany)
>
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Barry
> N1EU
> Sent: Thursday, November 24, 2016 11:31 AM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] On the Corsair II revival idea and receiver
> noise
>
> If the Corsair III ended up equaling or exceeding the K3S in
> performance with the body of an Omni VI+, I'd buy one.
>
> 73 & Happy Turkey Day,
> Barry N1EU
>
> On Thu, Nov 24, 2016 at 4:13 AM, GARY HUBER <GLHuber@msn.com> wrote:
>
>> Before I bought my Corsair-II and was looking at the Paragon and
>> Corsair-II, I was asked by one of the TenTec staff manning their
>> booth at Dayton, "What radio are you using now and what is your
>> principal use, DXing, nets, rag chewing or something else?" When I
>> responded that I was using a model 546-C and matching external VFO to
>> chase DX from a quiet rural location, his response was, "you'll be a
>> lot happier with a Corsair-II... you'll be able to hear weak stations
>> with it that will be covered in noise in the Paragon!" I bought the
>> Corsair-II and sold my OMNI-D to my best friend who had just become a
>> General licensee and was looking for a radio.
>>
>> I still have that Corsair-II which was built in the last production
>> run of model 561s. I did A-B tests with it and the Paragon (model
>> 585) I bought several years later for MARS work for Operation Desert
>> Shield and Operation Storm. In those tests which were done using a
>> DOW Key Relay reversed so that only one radio was connected to an
>> antenna or with a coaxial jumper between the two radios with one
>> switch set for AUX ANT and the other to AUX RX and with the radio
>> with the switch set to AUX RX having a good antenna connected to its
>> SO-239, the Corsair-II was always slightly better. Its those signals
>> below S-2 and into the RX/band noise where the Corsair-II comes out
ahead.
>>
>> I also had a fully loaded OMNI-VI+ (model 564) and found it, through
>> testing in the manner above, to be at least equal to the Corsair-II,
>> mostly due to 1.8 kHz and 500 Hz filters in BOTH I.F.s, making it
>> more selective and a bit quieter. The CAT serial port on the 564 is a
>> huge advantage for those doing computer logging while DXing or
Contesting.
>> The lack of frequency / mode information from an un-modified
>> Corsair-II like the one I own is its major drawback, in my opinion.
>>
>> I currently have an OMNI-VII (model 588) with a FLEX-1500 as its
>> sub-RX (N4PY mod) as my primary radio and with the Corsair-II as the
>> back radio. (see AB9M at QRZ.com for the station photo) While the
>> OMNI-VII is a great radio for my needs, in my opinion (and
>> experience) it needs to some careful adjustment of the RF gain to
>> avoid digital artifacts which are created from strong signals in the
>> passband when trying to work 2 kHz to 10 kHz from the DX station with
lots of callers.
>>
>> Regarding the cost of any Corsair-II replacement; I know there is the
>> issue of price, but I believe its also a matter of value for an
>> experience which cannot be matched by others. If you provide a pure
>> analog receiver and transmitter chain like the model 561 with only
>> DDS VFO and CAT serial ports then perhaps your market segment is in a
>> different range than the IC-7300. Today absent any product from
>> TenTec to replace my OMNI-VII and FLEX-1500, I'll keep my Corsair-II
>> and buy a FLEX-3000. The Eagle may need a replacement, but one for
>> the OMNI-VII and ORION is long overdue.
>>
>> --
>> 73 ES DX,
>> Gary - AB9M
>>
>> _______________________________________________
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>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
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