[NLRS] Re: [RMVHF] (no subject)

[Al Bergman]

Hello Hal,
   Thanks for your  best wishes. I will post to the reflectors as
several have asked the same thing today.   You are in a great location
for 10g work.  Last summer I was at Cheyenne and made contact durring
the 10g contest with a fellow on Pike's Peak.  What a place to play
from.. Ha Ha..   I am the only person in South Dakota  who has 10g
equipment with the exception of Bill K0OXU who sometimes is in the Hot
Springs area but isn't active.  I have spent a couple years building or
improving my equipment.  The setup used with KM0T was indeed narrowband.
We used CW, SSB, and tried FM.  All modes worked.  CW and SSB modes had
very pronounced distortion similar to aurora.  Signals were strong and
FM was tried at the end of the exchanges.  The interesting thing about
all this is that the FM mode was clear except during periods of qsb fade
when we  of course got threshold noise..
My equipment is as follows:
A Modified Macom whitebox is used for the transverter.
I use a wr90 waveguide relay with a modified Ku band LNB as my LNA
mounted right on the waveguide relay.
The whitebox feeds a 6 watt TWT which has its own 400 cycle power
inverter build in to work on 12 VDC. All the equipment works on 12 volt
as there is no hope of operation from my home.      The antenna is an 18
inch DSS dish on a tripod feed with eight feet of WR90 flexible
waveguide from the waveguide relay. The feed is the original horn part
of the Ku LNB. The LNB guts was removed and the back bored out to accept
3/4 inch water pipe presssed in for the transition to WR90.  I use an
IC706 for my IF rig..
   I applaud you for going ahead with your gunnplexer plans.  There is a
lot  to learn about 10G in general and the task is not so monumental at
first with gunnplexers and they are a blast to play with. I did a lot of
playing with them here at first and while I was building my narrow band
setup. By the way, I found some devices on Ebay called gunfets. They are
a drop-in replacement for the gunndiodes. The significant thing here is
that they draw about one tenth the current  but put out the same power.
This of course makes them many times more thermally stable. Better
stability equats to narrower bandwidth  and Narrow FM instead of wide FM
becomes possible. This is a huge improvement and I have tested this
several times while receiving my narrowband beacon with one.
Although there is still drift it is not that hard to keep the beacon
tuned in on Narrow FM mode...
73's,
Al

----- Original Message ----- 
From: <HBW0MXY at aol.com>
To: <w0puf at rushmore.com>
Sent: Sunday, July 11, 2004 7:54 AM
Subject: Re: [RMVHF] (no subject)


> Al:
>
> Congratulations on your 10 ghz contact.  I am interested in getting on
10
> ghz, & have a pair of gunnplexers that I plan to get going soon.
Later I would
> like to get some narrow band SSB and CW equipment.
>
> I suspect that your contact was with  some narrowband equipment, and
I'm
> curious about what you used.  Would you mind giving a rundown on what
you used ?
> Rig, power, antenna, etc.   Perhaps you would want to post that
information to
> the list also ?
>
> 73,             Hal                            W0MXY
>   Colorado Springs, CO
>