RE: Dunestar...
I have dealt with them this past year, purchased a set of bandpass filters
covering 80 - 10 meters for my radio club's field day event. I found
Dunestar to be a very responsive company dedicated to outstanding customer
service. I give them two thumbs up! We used the 20, 15, & 10M BP Filters for
a HF tri-plexer and they performed perfectly.
I swept the filters using a network analyzer and found them to be perfectly
tuned. I would except nothing less of the Dunestar HP Filter.
I have no commercial interest or relationship with Dunestar, just a very
happy client.
73,
Don Jones KO7i
Arlington, WA
-----Original Message-----
From: Rick - DJ0IP / NJ0IP [mailto:Rick@DJ0IP.de]
Sent: Monday, September 19, 2011 4:12 AM
To: 'Discussion of Ten-Tec Equipment'
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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