[Elecraft] K2/100 Flat topping on 30m?

Thu Oct 31 09:24:01 2002

Hi

I don't know if this is your problem but I had this come up in the KPA100=
 field test to the one I built. If R26 is set too low 30 meters would dra=
w a lot of current at high outputs. I was getting up around 25-30 amps at=
 100 watts out. Other bands were not as high this only affected 30 meters=
. If this is the case you may be overloading your power supply and the vo=
ltage is dropping. Have you monitored the supply while transmitting to se=
e if it is well regulated. The R26 problem was due to setting the power c=
alibration at 5 watts rather than 50 or 100 watts. When setting the calib=
ration that low it is easy to be off by a fair amount at 100 watts. R26 s=
ets the ALC feedback so it can cause strange reactions if not calibrated =
properly.

Don Brown
KD5NDB  =20

----- Original Message -----
From: [email protected]
Sent: Wednesday, October 30, 2002 11:51 PM
To: Jim W7RY
Cc: [email protected]
Subject: Re: [Elecraft] K2/100 Flat topping on 30m?

On Wed, 30 Oct 2002, Jim W7RY wrote:

> Is it possible you are getting RF feedback into the radio from the ante=
nna ?
> And only on that band due to antenna problems ?
> =20
> Or is this test shown into a dummy load ?
> =20
> Thanks and this is an interesting one!
> 73
> Jim W7RY

The test is into a dummy load.  Given the way I'm testing (Saying
"Helllllllllllloooooooooooooooo" into the microphone), it wouldn't be
legal for me to test with an antenna. <grin>

73 de John - KC4KGU
K2/100 #2490

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