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Re: [TenTec] Circuit question - Omni VI type 563

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Circuit question - Omni VI type 563
From: Stuart Rohre <rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 17 Jul 2009 20:18:20 -0500
List-post: <mailto:tentec@contesting.com>
I think the 1N4007 would work fine. They are actually, a HF type diode die, as well as being used as power rectifiers. Try to get a Motorola NOS set. (rather than unknown import or unmarked types). The 1N4007 would be the lowest cost as they are quite common. Normally for RF, you would use a purposely designed PIN type diode, but these die made a suitable substitute, as they had the PIN structure.

Stuart
K5KVH

David Feldman wrote:
I'm investingating a problem in my Omni VI type 563, possible diode failure
in the antenna T/R path. The low-pass filter board (81592) shows three
diodes in the main receive path from antenna to front end (D6, D7, D8) as
1N4007 rectifier diodes (but they appear to be used for RF switching.)

Is the 1N4007 still the normally used part for service, or should I look for
another device type.

Thanks,

73 Dave WB0GAZ

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