The Omni 5 used at least 3 different designs for band switching. Some
used relays other used diodes and yet others used transistors. All
used one big reed relay for keying the antenna. Personally, I've had
less problems with relays than with the other 2 methods. Diodes work
fine but can easily be ruined by strong EMP. It'a also amazing how hot
those switching diodes run. Try putting you finger on one sometime.
Steve N4LQ
----- Original Message -----
From: Steve Baron <SteveBaron@starlinx.com>
To: Steve Ellington <n4lq@iglou.com>; Clark Savage Turner
<turner@rome.ICS.UCI.EDU>
Cc: Jim Esser <jesser@amtelcom.com>; <tentec@contesting.com>
Sent: Friday, September 17, 1999 10:12 PM
Subject: Re: Fw: [TenTec] QSK clicking
>
> Where are they used in the VI.
>
> I didn't remember how my V did it so I took a look tonight.
>
> There is one large relay on the control board. You can definitely
hear that
> (not really bad) at the start and end of each xmit sequence.
>
> There are two reeds on the low pass filter board for xmit and rcv.
>
> There are a minimum of two additional reeds used to select the
correct low
> pass filter; 4 reeds I guess if working split across bands.
>
> Reeds are definitely heard (not really bad) on each element.
>
> The band pass filter board DOES use diode switching.
>
> -----Original Message-----
> From: Clark Savage Turner <turner@rome.ICS.UCI.EDU>
> To: Steve Ellington <n4lq@iglou.com>
> Cc: Jim Esser <jesser@amtelcom.com>; tentec@contesting.com
> <tentec@contesting.com>
To: <tentec@contesting.com>
> Date: Friday, September 17, 1999 10:20 PM
> Subject: Re: Fw: [TenTec] QSK clicking
>
>
> >
> >Now, my impression was that the replacement of pin diodes
> >with reed relays for the OMNI VI was an intentional
> >decision having to do with better isolation for t/r....
> >and not a cost decision. I have never thought about it
> >much beyond that.
> >
> >Clark
> >WA3JPG
> >
> >--
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> >
>
>
> --
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>
>
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