Rob:
This is interesting. My C 22 has low drive on 80 m as well. It seems to
get worse as the rig warms up. I checked the 80 m bandpass filter and
it looks OK. I am thinking that maybe the 80 m crystal, which is 10 MHz,
has low output and I was about to replace it, but first I'd like to
learn what the 40 m null pot does and how it affects 80 m. By the way,
the 80 m bandpass filter is not adjustable, but the filters for the
other bands are.
I have an original manual plus a downloaded one (not from Ten Tec) which
has a note for setting driver and final bias, but nothing on the null pot.
Please let me know what you find out.
Thanks.
73,
Bob WB2VUF
Rob Vaughan wrote:
Hi Walt,
Thanks for the reply. I downloaded the manual available from Ten-Tec online
(previous owner still looking for the original ;-) before I even picked up
the rig and there is no alignment procedure in there.
There is no description of what the "40m null" adjustment does or hint on
how to adjust it. Just a pic of the board that identifies it.
Anyone have the alignment procedure, or can I ask Ten-Tec for a copy of
that?
Thanks and 73,
de VE3XGB - Rob
----- Original Message -----
From: "Walt Amos" <waltk8cv4612amos@att.net>
To: "Rob Vaughan" <robvaughan@sympatico.ca>
Sent: Tuesday, April 20, 2010 10:50 PM
Subject: Re: [TenTec] Century/22 power out
If you have the manual or can download it the alignment sequence is
spelled out. Naturally you can send it to TenTec but that would probably
cost more than the rig is worth. Someone probably aligned it with out
taking the 40 M null into consideration or didn't know about it and it is
eating the 80M signal.
Walt K8CV Royal Oak, MI.
----- Original Message -----
From: "Rob Vaughan" <robvaughan@sympatico.ca>
To: <tentec@contesting.com>
Sent: Tuesday, April 20, 2010 8:03 PM
Subject: [TenTec] Century/22 power out
Hi All,
Recently took ownership of a Century/22 that I really like but a little
bit disappointed by the "20 watts out" claim. Mine puts out about 15W on
40m and 30m, but as little as 8W on 80m and 6W on 10m. It would be nice
to have closer to 20 especially on 80m where noise levels are higher of
course. I put my ammeter inline with the power supply and can see it
only draws 2.5A when the drive control is full clockwise on 80m whereas I
can drive it to 5.5A on 40m well before full clockwise drive and cause
the 979 supply to cut-out (as its supposed to).
When I spoke to Paul at TenTec he suggested it could be the 80m bandpass
filter (would that show low current though?) or that perhaps the "40m
null" adjustment needed adjusting. He said that can impact output on
80m. I should have asked him what it does because I don't understand this
adjustment. Perhaps someone out there can explain it to me. Don't want
to go adjusting something before I know what the impact/pitfalls are.
Thanks for all the help and 73,
Rob - VE3XGB
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