On 2021-09-04 14:31, Jim Brown wrote:
On 9/4/2021 2:03 PM, jerry wrote:
I made up a short length of RG8/U with 4 Palomar 31-mix giant ferrite
beads
Palomar SELLS these cores, at high prices. Fair-Rite MAKES them.
31-mix is supposed to be the hot ticket for HF common mode
chokes. One turn through one core is supposed to be 98 ohms at 5MHz.
So four cores should give me about 400 ohms, which should give a
worthwhile attenuation in a 50 ohm system. Thanks for the references.
It's interesting that I am not having any such problems with any
other equipment. My TS590S works fine. So did the K2/10 with my tiny
linear.
And a QRP-labs transceiver. And a uBITX transceiver. And a ICOM
IC706MKII.
None of this stuff is doing anything strange.
- Jerry KF6VB
- a common mode choke. No difference.
This is only a good choke at VHF. If your problem is HF, multiple
turns must be wound through the core. Study choke recommendations
here.
http://k9yc.com/KillingReceiveNoise.pdf
And here. http://k9yc.com/RFI-Ham.pdf
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
