K2 Low Power on 12 and 10 Meters

[Larry Dodson-2]

In the past I have looked up various problem fixes in the Old Elecraft
Digests, but can no longer find them?

I would appreciate suggestion as to how I fix my K2 low power problem on 12
and 10 Meters. I think that there is a pot to adjust?

Running the K2 without PA (ATU and Power Meter shows 1:1.1) into a dummy
load. I find that all HF bands get a full 10-12 watts output, except 12 and
10 Meters, where I get 7 watts on 12M and less on 10M.  This reduced output
is reflected on the watt meter when I hook up my external KPA100/KAT100 and
use more power.

Help will be appreciated in solving the output problem and also where to
find the Old Elecraft Digests.

73 - Larry- G0IKE (K2 -2424)
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[Sverre Holm (LA3ZA)]

Larry,

Take a look at http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#K2-tweak - second item - which talks about various tricks to do with the T2 and T1 transformers. Lifting T2 helped me.

[Don Wilhelm-4]

Larry,

Since you mentioned "a pot to adjust", what is the chance that you
increased the value of R98 (on the bottom of the RF board) above its
normal value of 270 ohms.
That resistor is sometimes increased to provide more rapid settling time
for the power control loop (particularly in TUNE), and the procedure to
find the correct value is to temporarily substitute a pot.  If the
resistor value is too high, the power on 10 (and often 12) meters will drop.

Remove the bottom cover to check R98.

There is no pot to adjust other than the temporary one mentioned above.

73,
Don W3FPR

On 11/17/2013 12:02 PM, Larry Dodson wrote:

> In the past I have looked up various problem fixes in the Old Elecraft
> Digests, but can no longer find them?
>
> I would appreciate suggestion as to how I fix my K2 low power problem on 12
> and 10 Meters. I think that there is a pot to adjust?
>
> Running the K2 without PA (ATU and Power Meter shows 1:1.1) into a dummy
> load. I find that all HF bands get a full 10-12 watts output, except 12 and
> 10 Meters, where I get 7 watts on 12M and less on 10M.  This reduced output
> is reflected on the watt meter when I hook up my external KPA100/KAT100 and
> use more power.
>
> Help will be appreciated in solving the output problem and also where to
> find the Old Elecraft Digests.
>
>

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