Thanks for that information Rick. That certainly is an option and I will do
that if I cannot find out how to get this done without having to take the
rig completely apart. I am thinking that there must have been several people
who have implemented Rick's (now W6NIR) fix. I am listening this morning
and there is no BC interference, but I still hear a lot of hash. It all
depends on band conditions. I gotta get rid of it.
Joe
----- Original Message -----
From: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Monday, September 19, 2011 6:11 AM
Subject: Re: [TenTec] Broadcast Interference Fix for the Corsair II
> Of course there is another way to fix the problem without digging into the
> rig, but it's not exactly cheap.
>
> Dunestar makes a highpass filter, model HPF-400 which you can simply
> insert
> in the antenna line, right at the transceiver. This external HPF will drop
> the signal level of the disturbing broadcast station and can be left
> inline
> all the time, but it will cost you $99 plus shipping.
>
> For more info, see: http://www.dunestar.com/model400.htm
>
> 73
> Rick, DJ0IP
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Joe
> Sent: Monday, September 19, 2011 4:14 AM
> To: TenTec Discussion
> Subject: [TenTec] Broadcast Interference Fix for the Corsair II
>
>
> Below is a posting I was so pleased to find in my search to find a
> solution
> for Broacast Radio Interference and hash on all bands of my Corsair II. I
> am
> anxious to try this fix but I the task of getting to the transistor Q2
> seems
> to be almost impossible. I want to talk to Rick, WA6NCX, but I have not
> been
> able to get up with him. Failing that, I would like to talk to someone who
> has completed this fix. I fear that if I am not careful here I will do
> something that I will regret. I would appreciate any help.
>
>
> Joe, N4YG
>
>
> WA6NCX posting 24 Aug 2000Subject: [TenTec] Broadcast Interference Fix for
> the Corsair III heard tremendous hash on 160 - 40 meters whenever I
> hooked
> my Corsair II to
> a big 80-meter full-wave horizontal loop. The problem was traced to
> overload of
> switch transistor Q2 on the 80969 LPF-TR board. The transistor junctions
> were
> rectifying a strong local BC station (putting over a volt of rf into the
> receiver!), whose
> signals passed right through from the antenna to the SWR detector and xmtr
> LPF's,
> through the TR switch diodes and then into the Q2 collector without any
> help
> from
> the rig's BC-reject high-pass filter network (the transistor is connected
> *before*
> the high-pass filter).
>
> After fooling around with a few false starts (which TT helped with, but
> didn't solve),
> it dawned on me that the fix is to connect the Q2 collector *after* the BC
> band high
> pass filter network, so that the strong BC station signal is greatly
> attenuated before it
> gets to the Q2 collector. So all I did was cut the trace to the Q2
> collector and run a
> short wire from the Q2 collector to the output of the BCB reject high-pass
> filter,
> right at the "RX" connector on the 80969 circuit board (at the junction of
> C7, L9,
> and L10). This fixed the problem completely -- no more hash and nice
> quiet
> reception
> on 160 through 40 meters.
>
> -- Rick WA6NCX
> remler@juno.com
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