[VHFcontesting] ebay 222 transverter boards

Zack Widup w9sz.zack at gmail.com
Sun Dec 14 22:13:31 EST 2014

The 222 MHz transverter design by W1VT that appeared in July 1993 QEX
is a high-performance unit. It does require three circuit boards which
contain printed hairpin filters. (I made mine myself.)

If you're inclined to build something from scratch, I highly recommend
this circuit.

73, Zack W9SZ

On 12/14/14, Dan Evans <dan.evans at insightbb.com> wrote:
> I wanted to take a minute to thank everyone for all of the replies.
> The general consensus is these could be a fun project, but they are a long
> way from a high performance transverter.  However, I'm still considering
> buying one and installing it in the empty battery compartment in my
> FT897D...
> Although I plan to stick with my original plan to buy a DEMI unit sometime
> in the spring.
> 73
> Dan
> --
> K9ZF
> Amateur Radio Emergency Service, Clark County Indiana. EM78el
> The once and future K9ZF /R no budget Rover
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> -----Original Message-----
> From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On Behalf
> Of Erich
> Sent: Sunday, December 14, 2014 1:56 PM
> To: vhfcontesting at contesting.com
> Subject: Re: [VHFcontesting] ebay 222 transverter boards
> The PA transistor he is showing there certainly has the capability of
> producing the 10W.  I have been looking at that one for some of my
> projects.  Without going through a full circuit analysis, it looks like
> a fairly straightforward basic transverter,.  It uses dual gate MOSFETs
> for mixers with no LNA, so I would be concerned about the NF and third
> order intercept point.  It looks like it uses diode switching for the
> T/R switching.  Looks like some packaged 97 MHz commercial oscillator
> for the LO; would like to know what the accuracy and stability of that
> is as well.
> 73, Erich
> N6FD
> DM15dp
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