[Boatanchors] KWM-2A Problems
Gary Schafer
garyschafer at comcast.net
Sat Jan 22 12:12:02 EST 2011
I haven't been into one in a long time either but it does sound like
alignment.
First try just peaking up the trimmers for each band. If it will peak up and
you get the proper power out where it was peaked but at the other end of
that band segment power is down then it is probably a tracking problem with
the slug tuned rack and the slugs have to be peaked at the proper place. Do
it according to the manual or you will end up with the tracking way off.
Sometimes those trimmers stick and all or some of the silver plating on them
comes off the ceramic and the silver sticks to the other half. The trimmer
may seem to kind of peak but doesn't tune properly. You now have a smaller
tune range. The trimmer is shot and must be replaced.
If you find that the trimmers want to stick very hard when you try to move
them, stop! You can disassemble each sticking trimmer and most times free
them up and lube them before you destroy the silver on them by trying to
move them when they are sticking. It is a tedious job.
73
Gary K4FMX
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Al Parker
> Sent: Saturday, January 22, 2011 10:58 AM
> To: n2lxm at juno.com
> Cc: boatanchors at mailman.qth.net; milsurplus at mailman.qth.net
> Subject: Re: [Boatanchors] KWM-2A Problems
>
> Hi Jeff,
> I'm far from an expert on the KWM-2A, but having owned 2 plus a 32S-
> 1,
> have had a little experience (often greatly enhanced by the experiences
> of others). I'm fussing along with a 32S-1 right now, helped out by
> others.
> It appears to me that the alignment of yours was carried out with
> the
> kc tuning knob set at zero, as on all the lower bands your output is
> best at the low ends of the ranges. IIRC, you should set the kc dial to
> 100. Your 3.4-3.6 output is low, but I've seen that on mine, too. I
> think it's a Q problem of the ckts on the lowest freq., not much can be
> done. 20m looks pretty good. Low on 15 & 10m could be due to weak
> finals or driver tube, but might come up a bit doing a full alignment as
> detailed in the manual. Be sure to read and follow all the manual
> steps, IIRC, the higher freq. bands, above 20m, depend upon the 20m
> tuning, so it must er done first. There's a caveat in there to not
> touch one slug adjustment until "later". That tripped me up once.
> I've seen ~120w out on some bands, but basically feel that 95-100 is
> acceptable.
> 73,
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>
> "There is nothing -- absolutely nothing -- half so much
> worth doing as simply messing about in boats"
> Ratty, to Mole
>
> On 1/21/2011 9:50 PM, n2lxm at juno.com wrote:
> > Good Evening All,
> >
> >
> > Thanks to all who responded. I be leave I got the ALC issue
> > fixed. clean the relay in the output compartment. But I still am
> working
> > on the low output problem. I took some measurements on all the bands
> and
> > here is the results. The transceiver output power was measured with a
> > Bird 43 Thruline Wattmeter using a 2-30 Mhz 100 Watt slug, the load is
> a
> > TS-1771/U Electro Impulse Labs 150 watt 50 Ohm load.
> >
> > Band Switch Position Frequency RF output
> >
> > 1A 3.4 Mhz 50 W
> > 1A 3.5 Mhz 45 W
> > 1A 3.6 Mhz 22 W
> >
> > 2A 3.6 Mhz 98 W
> > 2A 3.7 Mhz 60 W
> > 2A 3.8 Mhz 40 W
> >
> > 3A 3.8 Mhz 55 W
> > 3A 3.9 Mhz 39 W
> > 3A 4.0 Mhz 15 W
> >
> > 1B 7.0 Mhz 95 W
> > 1B 7.1 Mhz 85 W
> > 1B 7.2 Mhz 80 W
> >
> > 2B 7.2 Mhz 98 W
> > 2B 7.3 Mhz 80 W
> > 2B 7.4 Mhz 72 W
> >
> > 1C 14.0 Mhz 90 W
> > 1C 14.1 Mhz 90 W
> > 1C 14.2 Mhz 90 W
> >
> > 2C 14.2 Mhz 90 W
> > 2C 14.3 Mhz 90 W
> > 2C 14.4 Mhz 90 W
> >
> > 1D 21.0 Mhz 70 W
> > 1D 21.1 Mhz 70 W
> > 1D 21.2 Mhz 70 W
> >
> > 2D 21.2Mhz 70 W
> > 2D 21.3 Mhz 70 W
> > 2D 21.4 Mhz 70 W
> >
> > 3D 21.4 Mhz 55 W
> > 3D 21.5 Mhz 60 W
> > 3D 21.6 Mhz 60 W
> >
> > 1F 28.0 Mhz 60 W
> > 1F 28.1 Mhz 60 W
> > 1F 28.2 Mhz 60 W
> >
> >
> >
> > Jeff N2LXM
> > AMATEUR RADIO OPERATOR
> > AMERICAN
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