[Boatanchors] 300 ohm twinlead?

[Lloyd KK7IZ]

Tune for MAXIMUM smoke
Thanx
Lloyd  KK7IZ
kk7iz at cox.net

Lloyd Godsey  KK7IZ
1315 N. udall Circle
Mesa, Az  85203
480-620-7145 (cell)
Visit my  web site
www.lloydsdipsydumpster.com
And my NEW  web sites
www.antiqueradioarchives.com
www.antiqueaircraftradios.com
Collecting OLD civilian aircraft radios and literature
Particularly Lear. Got anything?
Some boatanchors got wings

----- Original Message ----- 
From: <Flowertime01 at wmconnect.com>
To: <boatanchors at mailman.qth.net>
Sent: Monday, May 30, 2005 7:07 PM
Subject: Re: [Boatanchors] 300 ohm twinlead?


> Steve,
>
> I do not know the answer to the question.
> I do not know what twin lead you are hanging onto.
>
> Old stories from my past was you could run a 100 watts
> of RF.
>
> Three limits. Volts, RF heating and Amps.
>
> At some voltage it will ark through the insulation.
> At some current it will heat the insulation and melt pure resistance and 
> wire
> heat.
> At some RF level it will heat the insulation and melt.
>
> Run it for a short test. Shut it down, ground it out and inspect.
> Up the power level and test again.
>
> Under a 100 watts and with final voltage under 700 volts you should be OK.
> If you expect some SWR that could push the standing voltages then think 
> about
> it.
> If you are working over those limits, Either test carefully, or order some
> better
> line from a supplier that has no relation to the other thread now going.
>
> The QRP world likes the stuff as folded dipoles.
> Easy to work with and get on the air.
> If you are running a transceiver under 100 watts you will be OK.
>
> If you are pushing more than that, you will want some better wire, just to
> avoid the line losses. Larger diameter wire than the 22 or 20 you will 
> find
> in the twin lead.
>
> Roger KC6TRU
> _______________________________________________
> Boatanchors mailing list
> Boatanchors at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/boatanchors
> ** List Administrator - Duane Fischer, W8DBF/W9WZE **
> ** For Assistance: dfischer at usol.com **
> $$ For vintage radio info, see the HCI web site $$
> http://www.w9wze.org
>
>