[Mobile-Portable] Screwdrivers and whips

[K0DAN]

I did the same thing (whip + tuner). Had a lot of fun (mostly higher than 14 
Mhz) and made a lot of contacts. But missed out on a lot also (mostly lower 
than 14 Mhz).

I am no longer mobile on HF but if I were to do it again I would definitely 
come up with a screwdriver design, and follow the guidelines on the K0BG 
site  http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=12686

Have fun.

73
dan
k0dan

-----Original Message----- 
From: David
Sent: January 18, 2014 00:17
To: Mobile-Portable Reflector
Subject: Re: [Mobile-Portable] Screwdrivers and whips

You are right!

I wasn't wise. I should have done my antenna efficiency studies BEFORE I
spent all that time and energy on the whip & tuner installation. BUT,
going back to the screwdriver cured the problems.

David
W7DBH



** The K0BG site is like a Handbook for HF mobile operations. Whether or not
** you believe an efficient HF mobile station can be built on-the-cheap, you
** are sure to find some good tips and practical info of various
** installations here.
**
** My own experience is that the ~108" whip with auto tuner is relatively
** stealthy (as stealthy as a 108" whip can be), but , even when installed
** high
** up, has poor radiation efficiency on freq's below about 14 Mhz. The tuner
** will make the transmitter happy but a lot of energy is being lost into 
the
** ground and vehicle chassis, and not going into the ether where it 
belongs.
**
** Of course you can make contacts at 40M and 80M (even 160?!?) with a whip,
** but the reality is a tuned antenna with an excellent vehicle ground
** distribution (and no noise) will give you 3-6 dB or more radiation
** efficiency.
**
** As with all things, your mileage may vary.
**
** http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=12686
**
** 73
** de k0dan
**
** ______________________________________________________________
** Mobile-Portable mailing list
** Home: http://mailman.qth.net/mailman/listinfo/mobile-portable
** Help: http://mailman.qth.net/mmfaq.htm
** Post: mailto:Mobile-Portable at mailman.qth.net
**
** This list hosted by: http://www.qsl.net
** Please help support this email list: http://www.qsl.net/donate.html
**
**


-- 
David B.

______________________________________________________________
Mobile-Portable mailing list
Home: http://mailman.qth.net/mailman/listinfo/mobile-portable
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Mobile-Portable at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html