[Top] [All Lists]

3-500Z's - is the 500ZG the way to go ?

Subject: 3-500Z's - is the 500ZG the way to go ?
From: ron@gw3ydx.demon.co.uk (Ron Stone)
Date: Wed Aug 16 21:58:25 1995
| Ron Stone, GW3YDX -    EMail ron@gw3ydx.demon.co.uk                 
You will have seen from a previous E mail that I've fried one of the 
3-500Z's in my L7. I made a good job of it - the anode structure 
entirely broke away from the top cap assembly. 

To get back on air for the contest season I need a replacement pair. 

Looking at the QST a pair of 3-500ZG's from RF parts at $225 looks 
pretty attractive compared with the regular Eimac price. But there is 
the old saying "you get what you pay for". Has anyone an observation 
on the RF parts tubes please. Are they Chinese Penta tubes in disguise 
maybe ? I've heard the 500ZG's have a 600w plate dissipation. Sounds 
good to me !

Replies, information etc welcomed. If any of you guys are coming to 
the RSGB HF convention at the beginning of September, would some extra 
luggage be a problem ? Do Email me if you can help please. 


>From Mr. Brett Graham" <bagraham@HK.Super.Net  Thu Aug 17 00:34:58 1995
From: Mr. Brett Graham" <bagraham@HK.Super.Net (Mr. Brett Graham)
Subject: HF Launch Angles
Message-ID: <199508162334.AA23019@is1.hk.super.net>

N4ZR said:
 The software Dean uses for measuring the effects of terrain is also
 available, either from the ARRL BBS or from various sites that FTP
 materials from QEX - buffalo.edu is one.  It's called YTAD.ZIP.
I tried, but buffalo.edu or ftp.buffalo.edu come back as unknown hosts from
here.  Can somebody tell me what I've got wrong, or another possible site
to try?  Thanks!
73, VS6BrettGraham aka VR2BG bagraham@hk.super.net

>From Frank Donovan <donovanf@sgate.com>  Thu Aug 17 01:43:16 1995
From: Frank Donovan <donovanf@sgate.com> (Frank Donovan)
Subject: Phased Beverages! (was: EVE vs Beverage?) (fwd)
Message-ID: <Pine.OSF.3.91.950816202534.18176B-100000@jekyll.sgate.com>

Hi Joe!

Thanx for the note, your plans for your new Beverage CONTEST antennas sound 
great to me!

If u do not terminate a Beverage, u don't need to slope either end!  
The slope affects only front-to-back ratio, and u will have minimal f/b 
without termination!

I slope my terminated Beverages for approximately the last 60 feet at each 
end.  The EZNEC model clearly shows the improvement in f/b ratio resulting 
from the slope; however, I haven't attempted to use EZNEC to determine optimum

I've never tried the concrete-filled bucket approach for temporary Beverage 
supports, but it sounds like a good idea to me!  I remove my Beverages 
during mowing season, using steel fence posts that I install every October 
and remove every April!  I add two foot fiberglas extensions to the top 
of seven foot steel T-posts.  I know other Beverage users have used 
concrete-filled buckets, perhaps they will comment on the pros and cons of 
that approach...

Good luck!


>From Takao KUMAGAI <je1cka@dumpty.nal.go.jp>  Thu Aug 17 01:57:30 1995
From: Takao KUMAGAI <je1cka@dumpty.nal.go.jp> (Takao KUMAGAI)
Subject: Mail from DL4MM (RUFZ)
Message-ID: <199508170057.JAA23146@dumpty.nal.go.jp>

Herb DL2DN forwarded me the following author's announcement to me.
So would you send me your score in the following guide lines. I or
Herb will post the International merged score listing occasionaly.

        Tack Kumagai JE1CKA/KH0AM
        TEL:81-30-066-6408, FAX:81-423-93-4449
        Internet: je1cka@nal.go.jp

------- je1cka@nal.go.jp forwards -------
From: "Dieter Dippel" <dippel@rrze.uni-erlangen.de>
To: je1cka@dumpty.nal.go.jp
Subject: Mail from DL4MM (RUFZ)

DL4MM  > DXNEWS   15.08.95 21:43 58 Lines 2475 Bytes #90 @WW
Subj: RUFZ HiScores WANTED !
FROM: dl4mm (Mathias Kolpe)
TO:   dxnews@ww

Hi CW-friends worldwide!                       August, 15th 1995

8 weeks ago I put the RUFZ-callsign-practice-program into the mailboxes.
In this time a lot a CW-friends from all continents send me Cor-Files.
Additional RUFZ came into INTERNET. Tack, JE1CKA reported about some 
hundred requests. So Tack had the idea to manage a international
HighScoreList of RUFZ-Scores in the INTERNET. But in this list most of
participants are from USA and Japan. Unfortunately Tack have no access
to the european PR-Net. Since I think there are in Europe a lot of 
good CW-freaks too I would like to manage a RUFZ-High-Score-List in
PR and merge it with the JE1CKA-list.
So Guys, if you have fun with RUFZ please report your score and 
maximum speed to me under following conditions:

1) Of course, each report you send to me is free of any manipulations and
   certified by your honour. 
   thats why it is not necessary to send a checksum
2) ONLY use RUFZ release 2.12 ( german or english version)
3) use only 50 calls for each attempt
4) initial speed is up to you, it is a part of your strategy to score
   (set ANY initial speed you like !)
5) number of attempts you needed is not required

Just send me a short line like : DL1XXX 12345 234  (Call,Score,Max.Speed)

You can use following ways:

1) Send a mail via PR to DL4MM@DB0TUD.#SAX.DEU.EU   
2) Send a mail via PR in the DX-Cluster to DL4MM
3) Connect me direct at DB0DSD-Digipeater
4) Send me a postcard, even if you have problems or suggestions
   Mathias Kolpe, Breitscheidstr. 17, D-01237 Dresden, GERMANY
5) Use Fax (+49 -351 252 63 13) or Phone (+49 -351 223 10 84)
You can send your score how often you like. I will publish the
RUFZ-HiScores weekly or biweekly at @CONTEST in the mailboxes
and additional in the DX-cluster and I will also forward to the INTERNET.

You like to play with RUFZ and have no software yet ?

1) RUFZ is a free program for radioamateurs
2) search in your next mailbox for item RUFZ at @IBM
3) if you have INTERNET-access look at
   ftp://kgise.geo.tu-dresden.de/pub/hamradio/incoming  or
4) if you dont found RUFZ or have no good link or RUFZ is not complete
   get in touch with me on one of the ways mentioned above

Solong Guys, I'm wonder how your scores are ! Even if you have not a
maximum score - nevertheless drop me a line !


------- End of forwarded message -------

>From Frank Donovan <donovanf@sgate.com>  Thu Aug 17 02:12:38 1995
From: Frank Donovan <donovanf@sgate.com> (Frank Donovan)
Subject: Beverages
Message-ID: <Pine.OSF.3.91.950816205301.18176E-100000@jekyll.sgate.com>

Hi Steve!
Thanx for your note!
The choice of Beverage length involves many factors, some of which include:

- Minimum length to produce useful pattern, probably 400 feet or so on 160M
which results in a 3 dB beamwidth of 100 degrees or so...  Short 
Beverages tend to be quite inefficient... so a preamp may be desirable!

- Optimum length to produce the "cone of silence" mode first published by 
  W1WCR in his "Beverage Antenna handbook," about 580 or 875 feet on 160M.

- Optimum length to produce the desired beamwidth.  On 160M a 400 foot 
Beverage has a 3 dB beamwidth of about 100 degrees, a 580 foot Beverage has a
 3 dB beamwidth of about 80 degrees and a 875 foot Beverage has a 3 dB 
beamwidth of about 70 degrees.  

Several amateurs have reported good success on 160M with Beverages of 1500 
feet or more!  At some point, the slow wave velocity propagating down the 
Beverage begins to deteriorate the low angle performance of the Beverage...  
Perhaps 2000 feet or so is the maximum useful length on 160M before 
narrow beamwidth and poor low angle response destroy the utility of the 

Phased Beverages offer a very attractive alternative to very long 
Beverages, by reducing the beamwidth, cancelling the pickup off the 
sides, increasing the signal level by 3 dB, and avoiding the poor low 
angle response of long single Beverages.


<Prev in Thread] Current Thread [Next in Thread>