[TenTec] In praise of older technology AM transmitwithTenTecrigs

[Rick - DJ0IP / NJ0IP]

Let me put some meat behind my previous post:

Filter:.....TenTec....INRAD....INRAD
Filter:.....Stock.....600Hz....2400Hz
-------------------------------------
- 2 kHz.....79dB......94dB.....85.5dB
- 5 kHz.....82.5dB....97dB.....95.5dB
-10 kHz.....86.5dB....98dB.....96.5dB
-20 kHz.....95dB......97.5dB...97.5dB

As you see, at 2kHz spacing, the BDR3 improves by 15dB with the 600 Hz INRAD
roofing filter.
There is nothing you can do to an OM7 or IC7800 (within reason) to come
anywhere near this level of performance.
NOTHING!

The fundamental difference here is the technical difference between upward
conversion and downward conversion.

AT THIS POINT Rob always jumps in and points out that it is not impossible
with upward conversion.
Indeed the PT-8000 achieves it, but at a $17K price tag.
That's why I added the modifier, "within reason".
For those of us who work for a living, $17K is beyond reason!

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Rick -
DJ0IP / NJ0IP
Sent: Wednesday, February 26, 2014 6:38 PM
To: n4py3 at earthlink.net; 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] In praise of older technology AM
transmitwithTenTecrigs

The Omni VI with the INRAD roofing filter is about 15 dB better than the OM7
or 7800.   Really no comparison.
There most certainly is a difference but you will probably only notice it in
a side-by-side comparison during a BIG contest; not in every day life.

I don't recall Rob ever testing the VI with INRAD.

73 - Rick, DJ0IP
(Nr. Frankfurt am Main)

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