OK...I'll pass that on the INRAD folks...
Ron Castro
Chief Technical Officer
Results Radio, LLC
N6IE
www.N6IE.com
(Formerly N6AHA)
----- Original Message -----
From: "Eric Scace K3NA" <eric@k3na.org>
To: "Ron Castro" <ronc@sonic.net>; "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Sent: Tuesday, January 30, 2007 8:52 PM
Subject: Re: [TenTec] Orion/O2 Drift Problem-who is interested in a fix?
> Ron --
>
> I would prefer to be able to lock the Orion's master oscillator (with
> a long averaging interval) to an external GPS-based 10 MHz standard --
> without degrading the very clean phase noise characteristics of the
> radio. W9AC's note sounds quite interesting. But the devil is in the
> details.
>
> In response to those asking why this level of accuracy is useful:
>
> a) phase-locked receivers can be helpful when comparing signals between
> two antenna systems (e.g., diversity reception);
> b) when one is crowded the edge of a band, it's good to have confidence
> as to one's actual location.
> c) crystals shift slightly when initially powered up (a permanent
> change). The change accumulates as power gets cycled on-off and the
> radio's calibration can become far off. Between five Orions used at one
> of the local contest stations, the frequencies are scattered over
> several hundred Hz after a few years of operation.
>
> 73,
> -- Eric K3NA
>
> on 07 Jan 30 Tue 01:21 Ron Castro said the following:
>> I exchanged e-mails this week with one of the new owners of INRAD with a
>> suggestion about marketing an low-drift OCXO mod to fix the warm-up drift
>> problem on the Orions and Orion II's, and he wants to know what level of
>> interest there might be in such a product. The stock radios drift about
>> 20 Hz (15 MHz WWV) in the first 10 minutes, then very slowly correct
>> themselves to the starting point over a period of about 3 hours, plus
>> they tend to drift with shack temperature. I often hear Orions on the
>> air, especially on the TT Sunday net, and very often they are 20 Hz low
>> in frequency. The fan mod on my website mitigates the problem to some
>> degree, but it's only a band-aid.
>>
>> In my opinion, a mod like this would simple (a direct replacement of the
>> existing 4-pin TCXO) and would be a welcomed improvement that would make
>> the radio function better as well as bring a higher resale value, much
>> the way many of the other fine INRAD after-market mods do.
>>
>> If you have even a remote interest in this mod I would like to hear from
>> you, either here or off-list! Note that I have no connection with INRAD
>> or Ten Tec other than being a customer.
>>
>> Ron N6IE
>> ron@n6ie.com
>> www.N6IE.com
>> (Formerly N6AHA)
>> _______________________________________________
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>>
>>
>>
>>
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