[Elecraft] 2-30 MHz Transmit?

[Matt Zilmer]

Hi Jay,

I use my older K3 and a newer one on MARS frequencies.  The KX3 is
used as a MARS ECOM / mobile unit with the KXPA100 amp.

The K3 has a TX donut hole around the 8.2 MHz IF.  I think TX is
locked out from 7.5 to 9.0 MHz (if memory serves).  The KX3 has no
such restriction, being a Zero IF transceiver.

Elecraft customer support can assist you with the unlock programs
needed.  You may have to supply your MARS credentials, but I'm not
sure how that is handled today.  It's been a while since I unlocked my
radios here.

Except for the K3's IF range, I've found no problems with TX and RX
from around 2.8 MHz to 25 MHz.  KBPF3 use is recommended though, so
that you have enough gain between ham bands.  Otherwise, the
sensitivity falls off in between bands.  Note: There is very little
MARS / SHARES activity above 20 MHz.

I'm also using the KX3's 2m module to work an above-and-below MARS VHF
repeater split, plus the odd set of simplex frequencies NMCM has
around 2m.

Again, from memory, Elecraft specifies performance inside the ham
bands.  I don't believe there are any published specs for general
coverage.  I haven't found any problems with between-band operation -
plenty of sensitivity and dynamic range, etc.

73!
matt W6NIA / NNN0UET



On Mon, 6 Apr 2015 09:37:12 -0700, you wrote:

>Can someone furnish the exact "unlocked" or MARS transmit frequency
>specifications for the K2, KX3 and K3?  
>
> 
>
>I think some of these radios may have gaps - due to RF filtering, IF, etc.
>
> 
>
>Also, what about the unlocked transmit specs for VHF in these radios?
>
> 
>
>Thanks,
>
> 
>
>Jay
>
>W6CJ
>
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Matt Zilmer, W6NIA
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