Posted by
Elecraft mailing list on
May 19, 2018; 10:14pm
URL: http://elecraft.85.s1.nabble.com/K2-Using-the-K2-above-29-MHz-tp7640947p7640963.html
OK, Dave. Yes, I am somewhat familiar with DEMI's predecessor of the K60XV. It had no Elecraft-style power control, so it wouldn't surprise me if the power fell off with frequency above 29 MHz. I guess I should test the 29+ MHz output level of the K60XV in the K2 I have with one installed.
Thanks for your info.
73,
Steve VE3SMA
--------------------------------------------
On Sat, 5/19/18, Dave Sublette <
[hidden email]> wrote:
Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz
To: "Steve Kavanagh" <
[hidden email]>
Received: Saturday, May 19, 2018, 4:54 PM
Well now
-- I don't think I was using the K60XV. When Steve
Kostro developed the DEMI board, it just was wired into some
point on the output chain. He changed the ON/OFF Power
switch on the back to select either the HF QRP signal or the
output of the transverter board at the BNC connector. The
output of the transverter was about 22 dBm or 220
mw.
Dave
On Sat, May
19, 2018 at 3:39 PM Steve Kavanagh <
[hidden email]>
wrote:
Thanks,
Dave.
Were you using a K60XV transverter interface or the QRP
antenna jack for transmit output (and if the latter, at what
power level) ?
73,
Steve VE3SMA
--------------------------------------------
On Sat, 5/19/18, Dave Sublette <
[hidden email]>
wrote:
Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz
To: "Steve Kavanagh" <
[hidden email]>
Cc: "Elecraft Discussion List" <
[hidden email]>
Received: Saturday, May 19, 2018, 2:12 PM
I have
used my K2 with a DEMI 2M transverter board in it to
drive
transverters from 902 through 10368 MHz for many
years.
When I used it to drive both 902 and 903 MHz portions
of
that band, the output was very much lower when 29MHz was
in
use for 903. I can't say whether it was due to the
29
MHz IF or the 144MHz transverter output. I didn't
pay
much attention to spurs as 902/903 is a trashy band
anyway. I have made many nice QSOs with the setup.
73,
Dave, K4TO
On Sat, May 19,
2018 at 1:18 PM Steve Kavanagh via Elecraft <
[hidden email]>
wrote:
The K2 is specified to operate
on 10m only up to 28.8 MHz. While contemplating
possible
future VHF rigs for a multi-operator multi-band
environment,
I have wondered about using a K2 as an IF for VHF
transverters at around 29-29.4 MHz (to avoid
interference
with bands using 28 MHz IF).
Both of my K2s seem to operate (VFO synthesizer works) up
to
30 MHz. At 29.5 MHz the available transmit power (QRP)
is
starting to drop off and this is quite noticeable at 30
MHz. The QRP PA efficiency drops off somewhat as
well.
There are a few receive birdies on the 100 watt radio,
but
the QRP one is pretty quiet - nothing that should be
noticeable under the extra noise coming from a
transverter. Turning the preamp on makes extra noise as
it
should (but it is after the bandpass filters so that
doesn't mean a whole lot). But it seems that it
should
work ok as long as I don't want more than 4-5 watts
(most likely I'd use a K60XV), perhaps with a bit
of
bandpass filter tweaking.
Are there any caveats that I am unaware of? Spurious
emissions, perhaps? Has anyone tried using their K2
above
29 MHz?
73,
Steve VE3SMA
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