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LF: Loop (was Re: IGBT in 136 KHz TX?)

To: [email protected]
Subject: LF: Loop (was Re: IGBT in 136 KHz TX?)
From: Warren Ziegler <[email protected]>
Date: Tue, 21 Jul 2009 09:20:43 -0400
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        What do you think is the upper power limit for a loop using
coaxial cable as a conductor?
I've run about 1.3 kW into my loop made up of one turn RG-11 and one
turn RG-214 (both turns parallel as in your case).
Once one of the coax conductors came into contact with wet leaves near
the feed point and began to burn through the insulation and the leaves
- the first indication was erratic aerial currrent.

       I'm thinking of running two Deccas into a combiner but not sure
if the loop insulation is sufficient.

73 Warren K2ORS

On Tue, Jul 21, 2009 at 1:47 AM, Laurence BY3A-KL1X
China<[email protected]> wrote:
> Jeff - The "turns" of the mains WD2XDW loop were just distanced parallel
> loops running in roughly the same plane to reduce the RF copper losses and
> open up the bandwidth a bit - . I did try a couple of "turns" but never
> managed to get the ommppff field. Interesting given the fact that some
> people use 2 turns on their K9AY's successfully -
> All the loops ends up welded together  on lugs and attached to the tuner.
> Ive just overhauled the tuner ready to put on line for WE2XPQ but it will be
> running lower power for a while as I dont want to start a forest fire in
> Alaska!
> Back home in KL7 on August 14th again...just need time...
> laurence
> BY3A-KL1X Tanggu China 34degC
> We2XPQ/ x Wd2XDW Wasilla AK
>  Subject: Re: LF: Re: IGBT in 136 KHz TX?
> Hello Markus and Rick!
> I have only just acquainted myself with your messages.
> (Just going out from hospital, big blood pressure problem...)
> Thanks a lot for precious information, of what make fun still!
> I recovered some ferrites N87 types which should work in 137 KHZ.
> Another subject interests me, it is the possibility of transmitting with a
> big spool of several turns (a bit as WD2XDW). But EIRP is much weaker than
> with a vertical aerial, then it is necessary to "push more"  in power!
> Thanks in advance!
> 73: Jeff / F6CWN
> ________________________________
> Windows Live™ SkyDrive™: Store, access, and share your photos. See how.


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