[R-390] LF on the R-390 etc

[g4gjl]

I know there have been several solutions to the problem of wanting to
receive MF/LF/VLF on the R-390 series.
I tried the cheat wire into the RF Deck test point and whilst this works,
there are birdies introduced by that mod and it affects the HF performance
adversely.

The solution I use instead is an outboard convertor from the Jackson Harbor
Press see:
http://jacksonharbor.home.att.net/lfconv.htm

I built the PCBs inside an hour and had the convertor working fine
immediately on power up. Its is very economical at USD15 shipped to
UK...less if you are in the USA!

The unit has n IF amplifier and has ample gain, without overloading the
front end of the receiver.
There are 7, 10 and 14MC IF versions available. I chose 7MC and was
surprised that there is little if any discernable HF breakthrough, and Im
using a 40 metre resonant dipole as the LF antenna.

I think this little kit represents the best soultion I have seen so far...It
receives Alpha down at about 11.1kc and othere stations well up above 500kc,
the 'official' lower limit of the R-390 series. It is really something to
hear the VLF Alpha at 7011 kc on the Veeder Root of my R-391!

Saves 6U rackspace for an R-389 too!

I have no connection whatsoever with the supplier: Im just a very satisfied
customer.

73 to you all

Pete
G4GJL