bill.lumnitzer at paonline.com
bill.lumnitzer at paonline.com
Tue Jul 12 16:43:38 EDT 1994
Sorry for not getting back to this sooner but my feed was disconnected for
a few days then a family vacation took precedence!
Received 6 or 8 suggestions regarding ways to improve rig isolation
in a multi-setup including the following:
1. Bandpass filters between rig and amp.
2. Coaxial stubs at the amplifier outputs.
3. Antenna/Rig selection.
4. Separate towers for each band.
1. BANDPASS FILTERS: These come in XMIT or RCV-only types. Xmit filters are
available from ICE (and elsewhere) or can be home-brewed -see K4VX'articles in
NCJ and Sept '88 QST, and the article in May? '94 QST; these designs include
both 3 and 5 pole versions. Rcv-only filters can be built per the NCJ article
by W3LPL and are a 5-pole design I think; these must be installed in the
"receive antenna" line of your xcvr since they won't handle any power. Some
stations use both types but it seems like the 5 pole Xmit filters would give
equal performance to the 'LPL ones (ICE filters are 3 pole and have 10-15 dB
LESS rejection than 5 pole types); filters can be cascaded but results unknown.
2. COAXIAL STUBS: Coax stub filters on "tees" (type N recommended) directly at
the amplifier output on each band; sometimes these work better 1/8 wave down
the line or a few feet after the power meter. Since my antennas are remotely
switched at the tower I'm thinking of trying stubs on each line BEFORE the
relay so they can be left PERMANENTLY mounted (isn't rf leakage from good coax
at HF pretty low?). You can use either 1/4 OPEN or 1/2 SHORTED stubs (I recall
seeing an old NCJ article on this by K2TR). Separate sets of stubs tuned for
CW and SSB should be used for best results, giving 25 dB attenuation or so.
Some stations use DOUBLE stubs at the second harmonic to increase the
attenuation while others recommend one stub at both HALF and TWICE frequency
(e.g. stubs for 40/15 and 10 on the 20m station). I tried coax stubs before I
got the ICE filters and they DID help but haven't tried them yet in combination
with the filters.
Another interesting suggestion was to measure the receive power on one band
while transmitting on another. Supposedly TENS or even HUNDREDS of watts
have been found in some situations! N4KG installs protective diode-resistor
networks at the receiver inputs to guard against burnout. I plan to use my
Bird to benchmark my station and then to track improvement? after each step.
3. ANTENNA/RIG SELECTION: Different combinations of antennas and rigs can have
a big effect on interference. Using multiple tribanders versus monobanders
opens the door to more severe interference and should be avoided if possible.
I use both tribanders and monobanders but plan to confine them to two separate
towers. I'm also thinking of trying some remotely located receiving antennas
(e.g. trap vert. and inv. vee or small tribander).
Some rigs "talk" to each other more than others (e.g. two TS-940s are
purportedly worse than two TS-930s) and combinations of "synthesized" vs.
"non-synthesized" (TS-830) can be tried (or try a Drake R4C for receive).
4. IF ALL ELSE FAILS: Several reported of having operated up to six stations
pretty much interference-free (except for 2nd harmonic) using the above
techniques with a single tower or rooftop. But this degree of success has not
been universal. In these situations Separate Towers (widely spaced) for each
band were the way to go. I have the space but not the energy to put up and
maintain all this hardware (two towers are enough!). Nothing dramatically new
came out of this except to prove that it CAN be done and there's still room
for a lot of experimentation. Now where is that 50W slug for the Bird....
73' de Bill N6CQ/3 Lewisberry, PA
(n6cq at paonline.com)
>From John Dorr K1AR" <p00259 at psilink.com Tue Jul 12 22:09:56 1994
From: John Dorr K1AR" <p00259 at psilink.com (John Dorr K1AR)
Date: Tue, 12 Jul 94 16:09:56 -0500
Subject: 1994 CQ Contest Survey
Message-ID: <2983129723.1.p00259 at psilink.com>
Thanks to everyone who replied to my message about the CQ Contest
Survey. As promised, attached is a copy of what we will be running in
the September issue. Feel free to be the first kid on your block to
respond and send me your survey reply via Internet.
73 John, K1AR
1994 CQ Magazine Contest Survey
Your Callsign (optional):
Contesting Experience (years):
1) Do you favor the concept of limiting contest operation to
portions of bands, thus creating "contest-free" operating
2) Who would you recommend should be the next inductee into the
CQ Contest Hall of Fame?
3) What do you predict the winning CQWW scores will be in the
year 2000 for the following categories:
Single Operator/USA SSB
Single Operator/World SSB
Single Operator/USA CW
Single Operator/World CW
4) Do you support the elimination of the traditional 59/599
portion of contest exchanges in favor of more meaningful
5) Should the single operator category:
A) Be limited to using only one radio? YES NO
B) Be allowed to use packet spotting? YES NO
6) What was your first contest operation?
7) How did you become interested in contest operating (circle all
A) Contest Elmer
B) Discovered contest operating while operating radio
C) Local radio club
g?8) At what age did you start operating contests?
9) Do contests still have the same appeal for you that they did
when you began?
10) As a contest operator, what feature(s) would you like to see
in the next generation transceiver?
11) Are you in favor of limiting transmitter output power to 100
watts for domestic contests?
12) If you had the power to change one and only one aspect of
contesting, what would you recommend?
13) In a few words, how does your spouse really feel about your
interest in contest operating (Ladies--feel free to answer
this question personally!)?
(use extra sheets if necessary)
Return your survey responses to:
John Dorr, K1AR
1994 Contest Survey
c/o CQ Communications, 76 N. Broadway, Hicksville, NY 11801
Deadline: November 30, 1994
------- End of Forwarded Message
>From Trey Garlough <GARLOUGH at TGV.COM> Tue Jul 12 21:57:59 1994
From: Trey Garlough <GARLOUGH at TGV.COM> (Trey Garlough)
Date: Tue, 12 Jul 1994 13:57:59 -0700 (PDT)
Subject: CT Reflector... (fwd)
Message-ID: <774046679.156000.GARLOUGH at TGV.COM>
CQ-CONTEST at TGV.COM Frequently Asked Questions (FAQ) List
Revised: June 20, 1994
What is CQ-CONTEST?
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QST; INFO-HAMS at UCSD.EDU and rec.radio.amateur.misc are good places to
look for a more rounded discussion of the hobby.
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>From Jim Stevens, KI4HN" <ki4hn at jabba.Cybernetics.NET Wed Jul 13 00:12:32 1994
From: Jim Stevens, KI4HN" <ki4hn at jabba.Cybernetics.NET (Jim Stevens, KI4HN)
Date: Tue, 12 Jul 1994 19:12:32 -0400 (EDT)
Message-ID: <Pine.3.89.9407121930.E19259-0100000 at jabba>
On Tue, 12 Jul 1994, Dave Pascoe wrote:
> Hmmmm.....2 reports now about how loud W5WMU was.
Make that 3. I was CQing on 80M. Most callers were S7-S9 barely above
the noise level. W5WMU was easily 30db over S9. He was so load that when
I first heard his signal I thought he had to be local. BTW, I'm in NC, and
he's in LA. Wow!!
73, Jim, KI4HN
ki4hn at jabba.cybernetics.net
More information about the CQ-Contest