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Re: [TenTec] Orion II Freqency response graph

To: tentec@contesting.com
Subject: Re: [TenTec] Orion II Freqency response graph
From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 19 Apr 2006 16:31:41 +0000
List-post: <mailto:tentec@contesting.com>
The solution is not to compensate for the high and low roll off with equalizing. That just attempts to force the rig to do something it's trying not to do. the result of that may be distortion and garbage. ideally, the rig should pass the desired response with no effort and the eq. etc. used to _attenuate_ audio in the proper places. It's interesting that the AM response, which looks like what you would see with a broadcast transmitter (except not as wide) would cover the lower frequencies with a nice gradual tapering going up, but the ssb response is much narrower regardless of the manufacturer's claim of something like 3.9 khz b/w. if the ssb curve can't be changed, the solution is not to force it but to find another rig with the desired response. TS870 comes to mind.

rob / k5uj

Not really - AM response is +/- 2dB from 20hz-3000hz don't get fooled by the vertical axis scaling

I realize that.  Problem is the way the +/- goes.  Using 150 Hz as a
reference, it's really a 4 dB DROP from 150 hz to 2400 hz on the AM curve
when the radio is ostensibly set for a "flat" EQ response (TX EQ = 0).

My internal and external EQ settings are quite different on the II than they
were on the v1. I know, I know, everything is relative :-)

Grant/NQ5T

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