Fwd: Re: K144XV

[Mike Harris-9]

Hi,

Mistake I only sent this the Harry instead of the list.

Regards,

Mike VP8NO


-------- Forwarded Message --------
Subject: Re: [Elecraft] K144XV
Date: Sat, 04 Oct 2014 16:38:17 -0300
From: Mike Harris <[hidden email]>
To: Harry Yingst <[hidden email]>

K144XV or other make?  I ran a test monitoring the KXV3 TX port and the
output was flat 28 - 30MHZ.  It started to roll off dramatically at
30.270MHz presumably due to the 10m bandpass filter and or the TX low
pass filter depending upon where you take the transverter drive from.

The K144XV is a two band device 144-146MHZ and 146-148MHz it swaps
conversion oscillator at the 146 boundary and so always uses 28-30MHz
drive.  An other make transverter is unlikely to do this and would
require a flat drive from 28MHz to 32MHz to cover the full band.  The K3
does not provide this.  This is the situation reported by KL7UW.

Regards,

Mike VP8NO

On 04/10/2014 15:07, Harry Yingst via Elecraft wrote:

> I just tested mine into a dummy load
> at 144 I get 7 watts and 148 I get 8 watts
>
>
>
>
>
>        From: Edward R Cole <[hidden email]>
>   To: [hidden email]
>   Sent: Friday, October 3, 2014 1:30 PM
>   Subject: Re: [Elecraft] K144XV
>
> Harlan,
>
> I was waiting to see if anyone from Elecraft would respond before
> replying.  I use a different transverter for 2m but the situation is
> the same using the K3.  RF output appears to drop quickly above
> 30-MHz when in the transverter mode though receive seems functional
> to 32-MHz enabling receiving the entire 4-MHz 2meter band.
>
> At 146.52 (K3=30.52 MHz) my 50w 2m transverter will only output 8w
> because drive drops to minimum.  This is too low for me to operate in
> the FM repeater sub-band of 2m as all but one repeater are > 65 miles
> from me.  Typically takes 25w to have a full-quieted signal thru
> these repeaters.
>
>   From what I understood in communication with Elecraft this is a
> hardware limitation with no fix.  That is the bad news.
>
> The good news is the KX3 suffers no power drop off over the whole
> 2meter band with the new 2M module.  3w drives my "little" RFS 2-23
> amp to 30w which is adequate for my FM needs.
>
> If I need more power the 30w drives my RFC 2-317 to 150w, and if that
> is not enough 55w out of the RFC 2-317 will drive my 8877 to
> 1400w.  Of course I do not use the 8877 with repeaters else they
> "melt down" :-)  I usually run my K3 with the 8877 via the 50w
> transverter for ms/eme.
>
> 73, Ed - KL7UW

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