I have built the Hendricks BTX20A 20m SSB
QRP kit rig. It works quite well, and I get 10w peaks out
of it. BUT...it has a limited tuning range of about 60 KHz
because it uses a one turn polyvaricon.
You can see the complete-with-frequency display
and "custom" enclosure here:http://www.qrpkits.com/bitx20a.html
There is also a 17m version but I have not built one.
I was lucky enough to buy mine a while ago when they
ere still offering "Board and Parts Only" kits, not
forcing you to buy their enclosure and their digital
There is a simple mod out there to convert the BITX20A
to using a Ten Turn Pot and a MVAM109 Varicap (or NTE618)
and a couple other simple parts to both make the tuning easier
AND increase the tuning coverage of the rig.
A friend helped me out with a very similar tuning
mod for the Radio Kits UK MKARS80, an *excellent*
and very well priced 80m SSB QRP Kit Rig.It too
used a Polyvaricon tuning scheme and some smart
guy also came up with a ten turn/varicap diode
tuning scheme to ease tuning AND *greatly* increase
tuning capacity (From about 170 KHz to over 300 KHz).
Another terrific thing about the MKARS is that it COMES
SHIPPED with a nice 16 X 2 LCD digital Frequency Display.http://www.radio-kits.co.uk/mkars80page.htmlNote to U.S. QRP Kit Makers: Get With The Program! Has anyone tried the Hendricks BITX20A varicap tuning mod?
I have heard some good things about it,
I wonder if there are any pitfalls or things like instability
to watch out for?. Yes, I know there is a Yahoo Users
Group for this rig (actually more than one as there are two versions
being marketed, one in India, one here in the USA by
Hendricks' company "qrpkits.com".
Would like to hear from and correspond with
anyone who has experience with this mod.
TNX ES 73, Ken AD6KA/5R8GQ