Re: Topband: RF choke/balun

2017-09-16 Thread Charles Moizeau
From: Topband <topband-boun...@contesting.com> on behalf of Rob Atkinson <ranchoro...@gmail.com> Sent: Saturday, September 16, 2017 8:40 AM To: Arthur Delibert Cc: topband@contesting.com Subject: Re: Topband: RF choke/balun Unless you like listening to noi

Re: Topband: RF choke/balun

2017-09-16 Thread Rob Atkinson
Unless you like listening to noise you don't use an inverted L on 160 (or 80) for receiving. Rob K5UJ On Sat, Sep 16, 2017 at 6:58 AM, Arthur Delibert wrote: > I think that’s right if the only issue is your own transmit signal bouncing > back from the antenna junction and

Re: Topband: RF choke/balun

2017-09-16 Thread Arthur Delibert
ng.com> Subject: Topband: RF choke/balun If you have enough radials at or below ground you won't need a common mode choke. You don't say if your inverted L will have an elevated ground system or not. If the ground system consists of 60 or more radials you can probably put a matching network out

Re: Topband: RF choke/balun

2017-09-16 Thread David Cutter via Topband
uot;topband List" <TOPBAND@contesting.com> Sent: Saturday, September 16, 2017 8:07 AM Subject: Re: Topband: RF choke/balun Hi Thanks for the replies, no I will be using radials on the ground, amount unknown, Thanks Trevor EI2GLB - Original Message - From: "Mike Waters&

Re: Topband: RF choke/balun

2017-09-16 Thread MR TREVOR DUNNE
ND@contesting.com> Sent: Friday, 15 September, 2017 18:56:59 Subject: Re: Topband: RF choke/balun If you're going with elevated radials, then a feedline choke is a must. Place it within a few feet of the feedpoint. Use four or five stacked 2.4" diameter #31 ferrite toroid cores with ab

Re: Topband: RF choke/balun

2017-09-15 Thread Mike Waters
If you're going with elevated radials, then a feedline choke is a must. Place it within a few feet of the feedpoint. Use four or five stacked 2.4" diameter #31 ferrite toroid cores with about six turns of coax wound through them. See K9YC's excellent reference to be sure. 73, Mike www.w0btu.com

Topband: RF choke/balun

2017-09-15 Thread Rob Atkinson
If you have enough radials at or below ground you won't need a common mode choke. You don't say if your inverted L will have an elevated ground system or not. If the ground system consists of 60 or more radials you can probably put a matching network out and the feedpoint and forget about

Topband: RF choke/balun

2017-09-15 Thread MR TREVOR DUNNE
Hi All I am planning on making an RD Choke for my 160m inverted L and was wondering what others use, I was thinking of 3 stacked ft240-43 cores and maybe 10-12 turns of some rg316 or the like small coax, With 61 or 31 be a better material to use and do I need more or less turns, I'm loosely