[TowerTalk] HF2V with Elevated Mount - Experience?

[n4kg@juno.com]

HF2V clarification - de N4KG

The basic antenna is a 32 ft vertical with loading / matching
coils roughly 2 to 3 ft above the base.  This is the configuration
used by KZ4V which proved to be competitive on 40M but 
noticably less competitive on 80M.

The HF2V manual suggests that top loading will improve
efficiency on 80M.  (Agree). They note that loading wires 
longer than 12 ft will result in an impedance on 40M that 
is out of their matching range.  I agree that this is an
improvement, but suggest that a top loaded antenna such
as the MFJ-1792 is still likely to be more efficient.  
(Notice the weasel words...hope no lawyers are reading).

Butternut suggests that sloping the top loading wires at
45 degrees is a reasonable compromise between loading
improvement and space requirements.  Their drawing 
shows the wires being attached several feet below the
small diameter top piece which reduces the effective
vertical height.

I don't have a clue how anyone can say the HF2V is
"center loaded" on 80M.  The added wires are top 
loading and the coils are so close to the bottom that
they are essentially base loading.

These are my OPINIONS on this subject.

de  Tom  N4KG


On Thu, 21 Dec 2000  "Ken Kinyon - W7TS" <w7ts@Qwest.net> writes:
> Tom,
> Everything you say about the MFJ antenna may well me true.  However 
> the HF2V
> is not bottom loaded on 80, only on 160, and it is essentially a  
> full
> quarter wave on 40.  the loading on 80 if installed a recommended is 
> both
> center and top.
> 73, Ken
> -------------------
> Kenneth E.  Kinyon
> 34 Princeton Circle
> Longmont, CO 80503-2106
> Voice/fax  (303) 684-0037
> E-mail W7TS@Qwest.net
> ALPCA #8339
> ARRL-LM
> -----------------------
> 
> 
> -----Original Message-----
> From: owner-towertalk@contesting.com
> [mailto:owner-towertalk@contesting.com]On Behalf Of n4kg@juno.com
> Sent: Thursday, December 21, 2000 06:40
> To: TOWERTALK@contesting.com
> Subject: Re: [TowerTalk] HF2V with Elevated Mount - Experience?
> 
> 
> The HF2V is BASE loaded on 80M.
> Base loading is the LEAST efficient
> and provides the least bandwidth.
> 
> KZ4V found her HF2V to be quite
> effective on 40M with 120 radials
> but was NOT competitive on 80M.
> 
> The relatively new and unknown
> MFJ 1792 80 / 40 vertical is full
> size on 40M and has an isolating
> coil and top hat for TOP loading
> on 80M.  TOP loading is the
> MOST efficient method of loading
> provides the greatest bandwidth.
> It is rated at 1500 W on 40M
> and 1000 W on 80M.
> 
> I am impressed with both the
> electrical and mechanical design
> of the MFJ-1792.  To top it off,
> it is reasonably priced at $160.
> MFJ will send a free manual
> on request.
> I have no affiliation with MFJ.
> 
> de  Tom  N4KG
> 
> 
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today!  For your FREE software, visit:
> http://dl.www.juno.com/get/tagj.
> 
> --
> FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
> Submissions:              towertalk@contesting.com
> Administrative requests:  towertalk-REQUEST@contesting.com
> Problems:                 owner-towertalk@contesting.com
> 
> 

________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
http://dl.www.juno.com/get/tagj.

--
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com