[TowerTalk] What's heating up ?

[Jim Kennedy]

Garys suggestion is right on. I assume from the the cap you describe that its a doorknob type. If so be sure it is RF rated and not a HV type used in power supplies, Total different characteristics. 

Jim
W7ouu

----- Original Message -----
From: "Gary Schafer" <garyschafer at largeriver.net>
To: n2ic at arrl.net, "Topband" <topband at contesting.com>, towertalk at contesting.com
Sent: Monday, March 13, 2017 4:00:42 AM
Subject: Re: [TowerTalk] What's heating up ?

Probably the capacitor. Try 2 or 3 smaller values in parallel to make your
2200pf. Then see if the drift is the same.

Or the coil wire size is too small.

73
Gary  K4FMX

> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Steve London
> Sent: Sunday, March 12, 2017 10:42 PM
> To: Topband; towertalk at contesting.com
> Subject: [TowerTalk] What's heating up ?
> 
> I am experimenting with the N4KG reverse feed method for 160 meters on a
> tower with a lot of stuff already on it. I like the possibility that
> elevated radials will be an improvement over my terrible, dry,
> mountaintop ground characteristics.
> 
> As I transmit, the SWR creeps up, pretty significantly. Something is
> clearly getting warm.
> 
> Possibilities:
> 
> - I am matching the 160 feedline with an L-network (series L, shunt C).
> TLW says 7 amps through the capacitor, with 3 watts of dissipation. The
> capacitor measures 2200 pf, the usual transmitting capacitor,
> cylindrical, about 3/4" in diameter.
> 
> - The M2 balun feeding the 40 meter beam on the same tower. I monitored
> the SWR on the 40 meter beam while transmitting on 160. No change in 40
> meter SWR.
> 
> - The M2 balun feeding the KT-36XA on the same tower. I monitored the
> SWR on the KT-36XA while transmitting on 160. No change in KT-36XA meter
> SWR.
> 
> - Gamma match on homebrew 15 meter beam. Gamma match is just a piece of
> RG-8 dielectric/center conductor inside aluminum tubing.
> 
> Suggestions on how to troubleshoot this ? Start by disconnecting the
> feedlines to the baluns ? And once I determine which component is
> heating, what then ?
> 
> 73,
> Steve, N2IC
> _______________________________________________
> 
> 
> 
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