[Elecraft] KFL1-4Module Low 15M Output

Thu Jan 24 13:50:00 2002

Steve,

  I saw the same thing on my KFL1-4.   I had to end up starting at the
beginning several times, once after each alignment session. Since 15 and 20
are the sum filters, I noticed that the slightest change in 20 gave a BIG
difference on 15. I was also using a OM-2, and was getting fairly frustrated
with the whole thing. It took me several times to get it right, and as you
get closer each time, the tuning gets hyper-critical. I did notice that the
absolute best on 15 was not the best power out for 20, but finally got it to
4.5W on 15, and 6W (max) or so on 20.

One of the tricks I found was that when you see the OM-2 needle start to
increase very rapidly, take it out of tune, give it a couple of seconds or
so, then start the tune again. This is particularly important as you get
closer to the best power out, as it gets very, very sensitive to adjustment.
Also, make sure you are going through the filters in exactly the order
specified, which I assume you are doing. You should be able to find a very
small nitch where you get good power out on both, though 15m will be lower.

Andy W5VCJ
----- Original Message -----
From: "Steve Sorrell" <[email protected]>
To: "elecraftlist" <[email protected]>
Sent: Thursday, January 24, 2002 12:11 PM
Subject: [Elecraft] KFL1-4Module Low 15M Output

> Hi,
> I am completing alignment of the KFL1-4 Filter module and I cannot get the
> 15 meter output to spec.
> Here is what I get on 15
>
> With the K1 set at 2 watts, I can adjust no higher than 1.3 watts (I've
> tweaked it at least 10 times)
> With it in 6 watts output, I get 3.3 watts out.
> With it in 7 watts output, I get 3.9 watts out.
> I'm using a OHR WM-2 analog wattmeter
> All other bands adjust with no problem, in fact they exceed specs.
> Any thoughts would be greatly appreciated.  I've been to the resource page
> and found nothing there.  I saw way back in Dec 2000, Zak Lau had a
similar
> problem with the old two band module but I didn't see where or if he got
it
> resolved.  Maybe I'm whistling in the dark and this is what I should
expect.
> If thats the case, I can live with it.  But, its probably something I did
> wrong.  I already know that ;-)
> Thanks again
> Steve Sorrell, W8SFF
>
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