MD characteristics at
higher voltages cannot be used in a 14 V system.
Roger/DL5RBW
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of ab2tc
Sent: Sunday, January 06, 2019 1:42 AM
To: elecraft@mailman.qth.net
Subject: Re: [
Hi Wes,
Agreed. In my view FETs are a mistake at the 14V level. The old K3 bipolar
PA is much better (but still not good).
Knut - AB2TC
Wes Stewart-2 wrote
> I have not observed a low power issue in my K3. OTOH, in my experience
> the K3S
> PA has been a huge disappointment. One reason for
I have not observed a low power issue in my K3. OTOH, in my experience the K3S
PA has been a huge disappointment. One reason for buying a K3S was a hope that
the TX IMD would be improved with FETs. This would no doubt have been true if
Elecraft designed the radio for 50 VDC.
Wes N7WS
On 1
Hi again,
One thought: What is your firmware version? I now remember that there was
one version that had a problem delivering full power on 15m only. This has
long been fixed. Make sure you have the latest.
AB2TC - Knut
ab2tc wrote
> Hi,
>
> How are you measuring your actual output and in whic
Hi,
How are you measuring your actual output and in which mode are you testing
it? I have a K3S and a K3 souped up to near K3S but still with the original
transmitter chain. I have no problem achieving 100W with either one of them
into a factory calibrated LP100A, testing it in FM mode. Overall I
I've always felt that the KPA3 in my K3 was marginal. For example, I've
never been able to get more than about 80 W out of it on 15 meters. (And
that's at about 14.5 V) Is the KPA3A any better?
73,
Scott K9MA
On 1/5/2019 15:23, Robert Friess wrote:
Hank,
The 2SC2782 is not internally matche
Hank,
The 2SC2782 is not internally matched and is the only part ever used in the
KPA3. The KPA3A uses MOSFETs.
73,
Bob, N6CM
On Sat, Jan 5, 2019 at 11:04 AM HP wrote:
> Anyone know if the Toshiba 2SC2782 transistors used in the K3 power amp
> have internal matching (mos cap and wirebonds ) ?
Anyone know if the Toshiba 2SC2782 transistors used in the K3 power amp
have internal matching (mos cap and wirebonds ) ?
Or did the K3 power amp ever use Motorola MRF247 transistors ?
Hank K7HP
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