[VHFcontesting] Tech Help needed

[chetsubaccount at snet.net]

This brings up again the age old question: do I want to DX or contest?

A high gain, narrow band antenna does not send a CQ in a wide azimuth. But today's rules allow you to call someone on your cellphone and ask them to get on and give you their grid while you beam there way. 

Vs.

Less elements on the yagi (but you can stack them  for more gain or have multiple yagis) and call CQs that may be heard over a wider coverage azimuth. 

Kind of like fishing- try by yourself to read the areas to fish vs. other boats telling you where to go. Either way you will catch fish and have fun.

Your station, your choice!

Hoping to catch many fish this January.

73,
Chet, N8RA



-----Original Message-----
From: VHFcontesting <vhfcontesting-bounces+chetsubaccount=snet.net at contesting.com> On Behalf Of Dan Evans via VHFcontesting
Sent: Saturday, January 2, 2021 7:59 PM
To: 'Jim Worsham' <wa4kxy at bellsouth.net>; Paul Rollinson <Paulrollinson at sbcglobal.net>
Cc: 'VHF Contesting Reflector' <vhfcontesting at contesting.com>
Subject: Re: [VHFcontesting] Tech Help needed

Hi Paul,No help here with the issue, but I wanted to thank you and the list for the topic.
I currently have a CC 6 element on a small tower.  I have a bigger tower I hope to put up soon, and I've been wanting to upgrade to the 6M7 if I ever get the tower project off the ground.  So I will likely face the same issues.
I've been following with interest.
73Dan
-- K9ZF  President, Clark County Amateur Radio Club,Amateur Radio Emergency Service, Clark County Indiana. EM78el The once and future K9ZF /R no budget Rover  ***QRP-l #1269 Check out the Rover Resource Page at:  List Administrator for: InHam+grid-loc+ham-books  Ask me how to join the Indiana Ham Mailing list! 

    On Saturday, January 2, 2021, 11:55:03 AM EST, Paul Rollinson <paulrollinson at sbcglobal.net> wrote:  
 
 Good morning all,

It appears that I'm not alone with this issue. It's a great antenna until you try to push up the band for the digital modes, with potential for more to come.

So far I've learned this from this list and other friends in the VHF spectrum:

The theory behind moving the shorting bars out to more the freq up the band may be based on simple J pole type design, when you short higher up the driven element, it increases in resonate freq.
The 70 ohm (RG-6) phasing line might be able to raise the center freq if shortened. If anyone has done this, please reply with length to attempt.
The driven element might be able to be sleeved increasing the diameter and potential bandwidth, which is the biggest problem with this design.
Electrically lengthening the T match bars using  retaining rings at the end may create an aching point at hi power and wet environment. This may be catastrophic for an amp and will not be explored.
Repositioning D1 may help but this has unknown effect of performance.
Finding a better, free space test range will be first on the list. I have 90Ft trees here so spanning 2 trees and hanging the antenna in the middle show be effective.
I still plan on calling M2 on Monday to see if I'm missing something

I will say this, great responses from the VHF community. Thanks to all.

73,

Paul Rollinson, KE1LI
Rollinson Associates
860-928-5147
860-208-8814 Cell/Text
Paulrollinson at sbcglobal.net

Representing Component Part 
Manufacturers for over 35 years

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