Lankford R390A mods and lots of other RX improvements

[John K5PRO]

Go to this website and select the Dallas Files, for Dallas Lankfords interesting papers on various receivers, along with some neat phased MW antenna projects and a synch demod.

http://www.kongsfjord.no/

[w3jn]

John - thanks for that!  I've read plenty about the "Langford AGC mods" but had never seen them.  There's plenty of good schtuff here on other receivers as well.

[WA1GFZ]

Dallas is a sharp guy!

[N9NEO]

There is a sync detector group on Yahoo.  Synch_AM  - that some of you RX Gurus might like to stop by and check out.  I am RX NOOBIE.  I joined group last week.

One of Dallas paper on the site claims very good results with elliptic low pass.  I guess plan is just to tune offset and reduce audio bandwidth. I have heard others claiming FB as well.  I am putting an elliptic audio filter on a board with a precision full bridge detector ala  K2CU.  Next project maybe Dallas  Ilosmd markIII.

http://www.amwindow.org/tech/htm/alowdisdet.htm

Bare boards 20 bucks each for precision rectifier and filter.  10 bucks if I can squeeze 2 sets on a board.

Frank,
Hope to get over there soon with your driver board.  Worked good with no track hacks to get running.  Hope I might be able to bid on Racal when it is done.  Wife and I are looking at vacation this year.  Either UK or Down old RT66 to LA.  If money left over then it would be good invest.  Sold my R8B.

John,
I built a 160m push-pull rig and am running it FB with a JN oscillator.


73
Bob

[WA1GFZ]

Bob,
The end of RT66 is PCH RT1. Across the street is Gladstones. I go there every time I go to LA for a good fish meal and watch the surf.