CT Keyboard Delay

Wed Nov 2 10:10:27 EST 1994

At G0KPW we found the reason for the keyboard delay was too low a POLL value.
It takes a long time for the FT1000 to send all its data to the PC. When you
are multi-multi there is plenty of other traffic on the network, and it is
surprising that CT gets a chance to do anything else, even with 486-66
machines. We ended up using the POLL command to set the value to 30. As I
recall this value is not saved in the BIN file so if you restart CT, you
need to enter the command again.
Another thing that slows down CT is staying too long in the Alt-G window.
While you are in this window network traffic is queued. Attention to the
cabling using good quality screened cable, ferrite beads and routing the
cable away from RF cables, seemed to pay off and the network behaved well
this year.
Dave G4BUO


>From Larry Schimelpfenig <lschim at mailstorm.dot.gov>  Wed Nov  2 11:25:26 1994
From: Larry Schimelpfenig <lschim at mailstorm.dot.gov> (Larry Schimelpfenig)
Date: Wed, 2 Nov 1994 06:25:26 -0500 (EST)
Subject: N4KG reverse fed antenna
Message-ID: <Pine.3.07.9411020624.A10391-b100000 at mailstorm.dot.gov>

On Tue, 1 Nov 1994, Jim Hollenback wrote:

> So what is this N4KG reverse fed antenna? 
> Jim, WA6SDM
> jholly at cup.hp.com

See article in June 1984 QST by Tom N4KG. In brief you calculate at what
point from the top of your tower represents 1/4 at the desired frequency.
Remember to figure in top loading. At that point, connect the ground braid
from the feedline to the tower and the center conductor to some number of
1/4 wave radials. 

In my case I have 55 ft of Rohn 25 with 8 feet of mast sticking out of the
top. At the 55 foot level I have a KT34XA and at 63 feet a rotatable KLM
40 meter dipole. With a little help from the article (Tom estimated the
top loading of a TH6 to be about 40 feet) I guessed that My tap point on
the tower would be about 35 feet from the ground. I connected the shield
of the coax to the tower at that point, and connected four 65 foot radials
to the center conductor and ran them out at about 55 degrees. While I was
shooting for about 3600khz, the thing resonated at 3700khz or so, and the
vswr at that point is 1.3:1 or so. 

One of the the OH guys is using it on 160, and Tom reported that a friend
of his did the same thing. Wonder if one could use it on 160 and 80 from
the same tower!

I've been very pleased with the results of mine. I had the tower gama
matched on 80 with about 40 radials under it. Had a recurring problem with
water getting into the matching capacitors. Don't have that problem now.
The KG special works better than the gama matched tower, and I can mow the
back yard again! Oh one final detail. Tom cut his for the cw band and
used a tuner to work up in the phone band. I do essentially the same thing.

73 de Larry K7SV in Virginia - lschim at mailstorm.dot.gov

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