SB-220 tube arcs

W8JITom at W8JITom at
Tue Apr 9 22:29:58 EDT 1996

My hard drive crashed and ate the last week of stuff that wasn't backed up.

Whoever it was that E-mailed me about parasitics causing tubes to arc over,
can you send again?

73 Tom

>From barry at (Barry Kutner)  Wed Apr 10 02:07:41 1996
From: barry at (Barry Kutner) (Barry Kutner)
Date: Wed, 10 Apr 96 01:07:41 GMT
Subject: Stacking TH7's
Message-ID: <iJ85LD1w165w at>

"Bruce (AA8U)" <aa8u at> writes:

> Have any of you tried stacking TH7's and if so have you found it worth the
> effort? How about the ring-rotor aspect?

Bruce - I have found it DEFINITELY worthwhile. I started off with one TH7 
at 76 feet and added the lower one at 40 feet on a Ring Rotor. Besides 
the obvious advantage of being able to "spray" signals in more than one 
direction, I have found about a 1 S unit advantage of the stack over the 
upper alone on 20 and 15. Haven't had enough experience on 10 m yet, with 
present condx.

In order to get adequate clearance of elements on my Rohn 45, I offest 
(oops, that's offset) the boom about 10 inches from center in the rings 
cradle. Otherwise, the plate that holds the two boom halves together gets 
too close the the tower leg as it rotates. 

Overall, the Ringrotor has worked well, despite occasional headaches.

If you have any specific questions, drop me a note.
73 Barry


Barry N. Kutner, W2UP       Internet: barry at
Newtown, PA                 Packet Radio: W2UP @ WB3JOE.#EPA.PA.USA.NA
                            Packet Cluster: W2UP >WB2R (FRC)

>From Ray Cameron <wq7r at>  Wed Apr 10 03:07:38 1996
From: Ray Cameron <wq7r at> (Ray Cameron)
Date: Tue, 9 Apr 1996 19:07:38 -0700 (PDT)
Subject: censorship
Message-ID: <199604100207.TAA29581 at>

I am astounded that a proposal to censor input to this source of information
has been found by some to be needed.  Contributors need to censor themselves
and not pass that  "responsibility" on to someone else.  I thank the people
responsible for making this reflector possible and they certainly  should
not be "given" the job of cleaning up junk mail for us.  


Ray, WQ7R

>From Doug Klein <wd8aub at>  Wed Apr 10 04:22:53 1996
From: Doug Klein <wd8aub at> (Doug Klein)
Date: Tue, 09 Apr 96 22:22:53 -0500
Subject: 90% of 487 Messages = Pure Crap
Message-ID: <199604100222.TAA08310 at>

-- [ From: Doug Klein * EMC.Ver #2.5.03 ] --

Here's a new thread.

What does everyone think about switching to fiber optics on their com port
networking?  Is it too cost prohibitive?  Is it worth the hassle?

I was at VP5FOC this year (and VP5VW last year) and we had a devil of a time
with RF getting into the long runs of com port networking cables.  Maybe the
was getting into the LPT keying lines, who knows.  Didnt have the time to
shoot it with other important matters (like making amplifiers work). 

Have any of the other multi-op computer guru's experienced similiar
9A1A?  KH0A?  9G/TY gang?  

Has anybody actually not had to take a third mortgage out on their hamshacks
finance a successful change over to fiber optics?

For those uninitiated, my limited knowledge in this subject area (thread) is
you can buy fiber optic to RS232 adapters and then string fiber optic cables
do your computer networking.  The obvious advantage (to me) is that you can
basically eliminate RF getting into the network.  We had one cable that 
was 75' long at VP5FOC to get two rooms wired together.  An open invitation
to RF in any environment.  Especially ours that was not well grounded.  (Or
possible to ground well:  Coral reefs/rock makes a crummy ground ... yeah,
water is better.  But too far away)

Reply direct and I will summarize.  Or, if you think this subject (thread)
is better 
that the ones you have been reading, by all means - send it to the reflector

73 de Doug - WD8AUB...

Flames gladly accepted.  

>From Charles H. Harpole" <harpole at  Wed Apr 10 03:40:43 1996
From: Charles H. Harpole" <harpole at (Charles H. Harpole)
Date: Tue, 9 Apr 1996 22:40:43 -0400 (EDT)
Subject: EL emergency and call for help.
Message-ID: <Pine.SOL.3.91.960409223752.25355B-100000 at Pegasus>

A call for help in a real emergency when life is in danger is never 
crap.  I feel sorry for you to think otherwise. 
One of the problems with SOME contesters is that they are selfish.  
Surely you would share a message on this reflector if it could do any 
good in a real emergency--which we have.  Shame on you.
 de K4VUD

>From Charles H. Harpole" <harpole at  Wed Apr 10 03:56:13 1996
From: Charles H. Harpole" <harpole at (Charles H. Harpole)
Date: Tue, 9 Apr 1996 22:56:13 -0400 (EDT)
Subject: EL social unrest messages
Message-ID: <Pine.SOL.3.91.960409225358.25355F-100000 at Pegasus>

The 4U1UN 14.268 net will activate for any other Liberian emergency 
traffic again tomorrow (April 10 USA time).  Listening/relay help and a 
clear freq. will be appreciated.
 de K4VUD

>From k6sti at (Brian Beezley)  Wed Apr 10 04:13:32 1996
From: k6sti at (Brian Beezley) (Brian Beezley)
Date: Tue, 9 Apr 1996 20:13:32 -0700
Subject: VOACAP
Message-ID: <199604100313.UAA15858 at>

I'd like to alert contesters to the fabulous VOACAP propagation-prediction
program available for free at  This is a version of the
professional IONCAP program that has been substantially enhanced for use by
the Voice of America on HF circuits.

Here's what you can do with VOACAP:  Specify the month of the year, the
sunspot number, your QTH, power, antenna type, height above ground, and many
other station parameters.  Define an area of interest (Europe, for example).
VOACAP then draws a map of the area with receive signal strength, S/N, MUF,
radiation angle, or any of a dozen other parameters overlaid as continuous
color regions.  You can see your coverage area at a glance.  You can change
any parameter and see how it affects coverage.  The graphics are stunning
and the information fascinating.

I think every serious contester should have a copy of VOACAP.  It's a
tremendous tool both for investigating unknown but possible DX paths and for
checking your coverage into high-rate regions.  For example, Dean Straw,
N6BV, checked his coverage into Europe by plotting signal-strength maps.
The maps revealed unexpected coverage holes in localized but high-population
areas due to pattern nulls in his antenna system.  There's simply no other
way to obtain valuable information like this.  Get the Windows version--the
DOS version lacks certain features and will not be developed further.

To increase VOACAP prediction accuracy, I've written a little utility to
convert elevation patterns generated by the TA 1.0 Terrain Analyzer program
to VOACAP antenna files.  This utility lets you generate VOACAP maps using
the elevation pattern of your specific antenna system as sited in your local
terrain.  If you have TA and would like a copy of this utility, I'll be
happy to e-mail it to you.  Please specify uuencode, MIME, or BinHex format.

                      73--Brian, K6STI
                          k6sti at

>From oo7 at (Derek Wills)  Wed Apr 10 04:18:20 1996
From: oo7 at (Derek Wills) (Derek Wills)
Date: Tue, 9 Apr 1996 22:18:20 -0500
Subject: Moderation

	No burden, time-wise, on any one person.  A real technical
	type or two would ensure that the really good engineering stuff, 
        so far over my head but such a truly valuable part of the reflector, 
        gets on, but not the way-out stuff. 

	I nominate WN4KKN, KM9P, AA5BT, W0UN and W6QHS.

	-- 73, Walt, AC1O 

It's kind of you to offer this additional work, but I'm liable to let
through stuff that some people complain about.  For every 10 fan letters
I get one that says "grow up".   I suppose it depends how serious we
have to be.   One person's laugh of the day is someone else's waste of
valuable time.

I really don't think moderation (or censorship) would work here, it would
only delay the postings for one thing.  An occasional reminder from the
first-mentioned above about not getting too way-out does restore some
order here.   I think it's a great resource, and am willing to take the
chaff with the wheat.

Derek AA5BT

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