[Elecraft] XV50 on 70MHz

[AD6XY - Mike]

Thanks Allan,

I have managed now to get to an output of about 0 dBm from the driver stage.
I have not got the power module in as I doubt it will work on 70MHz. I will
replace it with one that does.  The 0 dBm is a little disappointing but I
know why and am working on fixing that.


The harmonic trap you mention is actually a low pass filter. I have modified
it for 42MHz. I have also modified the low pass filter at the output. 

The band pass filter is currently half modified, the same coils but
different Capacitors. When I completely finish the modification, I will post
a link to a web page with the full details. If it is ppossible to maintain
performance with the original coils, it is a much better option than buying
10,000 to replace 3 of them.

I am interested in your component values, especially for the LNA 

Mike



Allan Duncan-3 wrote:
> 
> 
> 
> Hi 
> 
> I converted an XV50 to 70MHz at the end of 2006 and have used it (with my
> K2) on SSB and CW during a few of the RSGB 70MHz contests in 2007. I have
> been very pleased with the performance of that combination - particularly
> on
> CW.
> 
> I have access to a modern spectrum analyser - both the two tone TX IMD and
> spurious performance were similar to an unmodified XV50.
> 
> I purchased replacement L's and C's from Mouser in the USA. The L's are
> made
> by a company called Xicon and are identical to those originally fitted. I
> suspect that Mouser supply Elecraft themselves with the L's in their
> transverter designs.  
> 
> Unfortunately, since I purchased mine, the minimum order quantity for
> these
> has been increased from 1 to 10,000 from Mouser (www.mouser.com) and I
> have
> been unable to find another supplier anywhere.
> 
> The XV50 2nd harmonic trap (C58, C59 and L3) will need to be removed for
> 70MHz. 
> 
> If I get a chance this evening, I will post my component values I used to
> modify my XV50 to 70MHz.
> 
> 73
> 
> Allan
> GM4ZUK
> 
> 
> 
> 
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