LO Power for XV transverters

[Rajiv Dewan, N2RD]

I have a full stack of XVs and just migrated to a K2 for IF.  Each of  
the XVs has a crystal oven.  I notice in the stock config for K2, the  
LO power jumper at JP9 is 1-2.  (All other jumpers are set as  
recommended for K2 IF with 0dBm drive and split paths.) Following the  
schematic it seems to imply that the LO and oven will be on only when  
the band is selected on the K2.  I would prefer to have all the LO  
and Ovens be on when K2 is on.  It seems that I can achieve this by  
switching the JP9 jumper to 2-3.  Is this correct?  Any downside to  
this change?  I am running this in my shack to the incremental  
current draw is not an issue.

Any thoughts appreciated,

Raj, N2RD
K2 #5613


--
Rajiv Dewan, N2RD
[hidden email]
FN13fc

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[Don Wilhelm-3]

Raj,

The full set of oscillator and oven power jumper options is on page 74 of
the transverter manual.  If you are using the oven and want the best
stability, I would believe you would want the oscillator and oven on all the
time (even when the K2 is off), and for that, the jumper is placed on 4 and
5.  You are correct - if you want the oscillator and oven to be powered only
when the K2 is powered, the jumper goes on 2-3.  With the junper on 1-2, the
oscillator and oven are powered only when the transverter is selected.

73,
Don W3FPR

> -----Original Message-----
>
> I have a full stack of XVs and just migrated to a K2 for IF.  Each of
> the XVs has a crystal oven.  I notice in the stock config for K2, the
> LO power jumper at JP9 is 1-2.  (All other jumpers are set as
> recommended for K2 IF with 0dBm drive and split paths.) Following the
> schematic it seems to imply that the LO and oven will be on only when
> the band is selected on the K2.  I would prefer to have all the LO
> and Ovens be on when K2 is on.  It seems that I can achieve this by
> switching the JP9 jumper to 2-3.  Is this correct?  Any downside to
> this change?  I am running this in my shack to the incremental
> current draw is not an issue.
>
> Any thoughts appreciated,
>
> Raj, N2RD
> K2 #5613
>
>
> --
> Rajiv Dewan, N2RD
> [hidden email]
> FN13fc
>
> --
>
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[Ron D'Eau Claire-2]

That's FB Raj, it's exactly what JP9 is provided to do (See the left column
on page 19 of the Transverter Owner's Manual.)

It's also described in Appendix C, Jumper and DIP switch settings. If you
have an older manual, you can get the new manual from the Elecraft web site.

Ron AC7AC  

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Rajiv Dewan, N2RD
Sent: Thursday, July 06, 2006 5:53 AM
To: [hidden email]
Subject: [Elecraft] LO Power for XV transverters


I have a full stack of XVs and just migrated to a K2 for IF.  Each of  
the XVs has a crystal oven.  I notice in the stock config for K2, the  
LO power jumper at JP9 is 1-2.  (All other jumpers are set as  
recommended for K2 IF with 0dBm drive and split paths.) Following the  
schematic it seems to imply that the LO and oven will be on only when  
the band is selected on the K2.  I would prefer to have all the LO  
and Ovens be on when K2 is on.  It seems that I can achieve this by  
switching the JP9 jumper to 2-3.  Is this correct?  Any downside to  
this change?  I am running this in my shack to the incremental  
current draw is not an issue.

Any thoughts appreciated,

Raj, N2RD
K2 #5613


--
Rajiv Dewan, N2RD
[hidden email]
FN13fc

--

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[Ron D'Eau Claire-2]

Raj, N2RD wrote:
 
Thanks to all who have responded.  I have to read the manual more thoroughly
before asking the net!

I think I will go with JP9 4-5 to power the ovens all the time.  

BTW, I really like the integration between the K2 and XV transverters.  I
use DX4WIN logging software and yesterday I clicked on a 6m spot and there I
was.  The transverter turned on, it was selected and I was ready to go in a
jiffy.  Nice!  I am going to enjoy using this setup for VHF contesting.
 
------------------------------------
 
Ha, ha! Or it says the manual needs to be organized better so you can find
things like the jumper options. In fact, that was one of the goals of the
latest version of those manuals.
 
One reason for making power to the ovens (and local oscillator itself)
switchable was to avoid the possibility of a harmonic of one of the local
oscillators causing local QRM  on another band. That's not normally a
concern, but you have the option of disabling an L.O. when the transverter
is not in use if that happens.
 
Ron AC7AC

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