[TenTec] 1 kHz IMD with Preamp ON/OFF

[Eric Scace K3NA]

Bill --

   I would be surprised if the built-in 1000 Hz filter has only 4 poles.  I would have expected it to have 8 poles, like the 2.4 kHz
filter.  This would be interesting to clarify.

-- Eric K3NA

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Bill Tippett
Sent: 2003 December 22 06:45
To: tentec at contesting.com
Subject: [TenTec] 1 kHz IMD with Preamp ON/OFF


G3ZEM/5B4AGN wrote:
 >I wonder about the answer to your first question too and like you I
suspect accidental transposition of data as the cause.

         That's my guess also but QST's summary is consistent with the ETR
graph, so it is not an obvious transposition as the IP2 results were.
Will be interesting to see if Michael can help clarify this point.

 >So far as close
in degradation on the K2 is concerned; I strongly suspect this to be due
to the rather gentle skirt slope of the K2 xtal ladder filter.

         Could be, but Orion's 1000 Hz roofing filter used in this test does
not have a great shape factor either.  According to N4PY it is a 4-pole
and about a 3:1 shape factor.  The biggest difference may be the fact
that the older K2 did not have DSP (which it now does) and of course
Orion used a 500 Hz DSP filter following the 1000 Hz roofing filter.
When ARRL's new test of the K2/100 is published, I suspect the K2's
results should be much better.

                                         73 & Merry Christmas!

                                         Bill  W4ZV



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