[TenTec] ICOM 7300 Sherwood Report vs. Ten-Tec Radios

Wed Apr 27 05:47:58 EDT 2016

Rob Sherwood has chosen the DR3 @2Khz as ranking.
Sure one could prioritize for any other here, or make  a equasion out of 
several

But there is much more to it about deciding what is a better receiver.
First of all I recon its reproduction of audio the most important.

How well can it reproduce a weak signal with nearby QRM or deeply buried in 
the background noise?
DSP IF filtering (especially its shape) is great at offering good 
selectivity and show superb benchmark results.
That is where it all ENDS.

Just try this; compare any of your analog receivers (TenTec/Drake/Elecraft 
K2) with the DSP-rig between 100Hz and 250Hz BW.
IMPORTANT: doe NOT use a test-carrier, use a modulated signal  (CW, S/N-test 
pulse, quick bursts, whatever).
One will find that as soon as the test signal is switched from carrier to 
modulated carrier, it becomes non-readable in DSP rigs.
And becomes more apparent if you switch from benchmark testing (quiet noise 
floor) to on-air testing.

Only DSP rigs which offer a more analog shape still reproduce a readable 
signal, AKA you can make the QSO.

Both ORION and ORION II are good at this. That is why, although I have 
tested many newer rigs these last few years, I keep using them.
I need to be able to dig out the message, make the QSO.

I still cannot understand why we keep comparing rigs at benchmark horsepower 
figures.
The DR3 figures are all above the min required level (85dB) for some 10yrs 
now.

73 Mark, PA5MW

-----Original Message----- 
From: rick at dj0ip.de
Sent: Wednesday, April 27, 2016 10:00 AM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] ICOM 7300 Sherwood Report vs. Ten-Tec Radios

Hi Terry,

Unfortunately the list is no longer fool-proof.
In fact it is deceiving.

If you notice, the IC-7300 is above the Orion and just under the Orion II.
Yet the Orion will out-perform the 7300 quite a bit in contests.
The 7300 blocks too early.  This is not reflected in the DR3 measurement.
( ROB, please correct me if I'm wrong here. )

The trouble with the list is, it ranks only by DR3.
With these Direct Conversion SDR radios, there are other factors which can 
cause its performance to fall short, even when its DR3 is good.

IMO the list can no longer be used as an indication of a radio's absolute 
performance.
In fact I don't think it is possible to do a list showing this; too many 
parameters to be considered.

Fundamentally we need to rand DC SDR radios in a separate list, with each 
other.

AND, IMO most of us can leave off the list:
> Flex 6700, 6500, 5000, 3000
> IC-7851
> PT-8000
> Perseus

Because they are either too expensive, have no knobs and require a computer 
all the time, or they are only a receiver.

Of the list of likely to be purchased transceivers, that places 4 Ten-Tec 
radios in the top 10, beginning with the O2 at position 5.

73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of terry 
foskey via TenTec
Sent: Wednesday, April 27, 2016 1:39 AM
To: tentec at contesting.com; Terry Foskey
Cc: terry foskey
Subject: [TenTec] ICOM 7300 Sherwood Report

Couldn't help but notice that we still have Ten Tec rigs in the top 15 or 
so.
See Link:  Receiver Test Data

N5TF  Terry

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