[Elecraft] [K2] Using the K2 above 29 MHz

[Steve Kavanagh]

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 <k4to.dave at gmail.com> wrote:

 Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz
 To: "Steve Kavanagh" <skavanagh72 at yahoo.ca>
 Cc: "Elecraft Discussion List" <elecraft at mailman.qth.net>
 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 <elecraft at mailman.qth.net>
 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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