Re: Topband: 160 GP Choke

2014-09-30 Thread Jim Brown
On Mon,9/29/2014 7:00 PM, Mike Waters wrote: >From p. 33: "With RG-6, RG-8X, and RG-59, use 7 turns through five 2.4" o.d. #31 toroidal cores." Looks like it could stand one more core and one more turn, if I only used it on 160 and 80. You must have an old version of it -- the latest is summer

Re: Topband: [Bulk] Re: 160 GP Choke

2014-09-30 Thread Grant Saviers
Jim, Would the type 75 material from Fair-Rite, be a better choice for 160 & 80 with 5 turns thru the 0.75" id clamp on? http://www.fair-rite.com/newfair/LowFreqSuppression.html your thoughts? Grant KZ1W On 9/29/2014 11:56 AM, Jim Brown wrote: On Mon,9/29/2014 10:43 AM, wb6r...@mac.com wr

Re: Topband: [Bulk] Re: 160 GP Choke

2014-09-30 Thread Jim Brown
On Tue,9/30/2014 6:28 AM, Grant Saviers wrote: Would the type 75 material from Fair-Rite, be a better choice for 160 & 80 with 5 turns thru the 0.75" id clamp on? It depends entirely on cost of the component. The peak of the impedance of a single core is in the right frequency range, but a sin

Re: Topband: [Bulk] Re: 160 GP Choke

2014-09-30 Thread Tim Shoppa
The 0.75" #75 clamp-on is 0475176451 and circa $15. By my connibulations it'll be a really close squeeze to get 5 turns of RG-6 through there. I think 5 turns of RG-58 could happen. The 2.4" #31 core is 2631803802, circa $7 and much easier to get many more turns of RG-8X through it. Tim N3QE On

Re: Topband: 160 GP Choke

2014-09-30 Thread Jim Brown
No. I wrote badly. Measure out two 5 feet lengths of enameled wire. Tape them together (a single wrap of tape every 5 inches or so) and wind that pair of wires 16 turns around a single core. Connect it at each end as a two-wire transmission line. 73, Jim K9YC On Tue,9/30/2014 3:42 AM, Mark v

Re: Topband: [Bulk] Re: 160 GP Choke

2014-09-30 Thread Jim Brown
On Tue,9/30/2014 9:36 AM, Tim Shoppa wrote: The 0.75" #75 clamp-on is 0475176451 and circa $15. By my connibulations it'll be a really close squeeze to get 5 turns of RG-6 through there. I think 5 turns of RG-58 could happen. And you would not WANT to wind turns through it -- that would move t

Re: Topband: [Bulk] Re: 160 GP Choke

2014-09-30 Thread Guy Olinger K2AV
I like to wind these kinds of things using RG400. That's RG58-sized teflon dielectric and teflon jacket with silvered copper double shield and silvered copper fine wire stranded center conductor. RG400 is specifically made to be put in airplane wiring harnesses with all those sharp bends and corner