I have some questions along that line Jim.
I see chokes made of 2 or 3 cores with "tightly wound turns, yet when I
look at your data, it appears "to me" that larger diameter turns are
more effective. Adding chokes in series is effective. I've seen that
with the current fan dipole for 75 as well as you hanging 3 in a row
Then I see the tightly wound choke using parallel THHN wire. I believe
the THHN is fed as if it were a single wire.
If I could get by with two chokes of 2 cores in series, would the
parallel THHN, or RG-400 tightly wound with 7 or 8 turns be as effective
as the chokes shown.
I need to go back and read the part with the parallel THHN again.
Unfortunately, I don't absorb this as quickly as I did 30 or 40 years ago.
I'd like to keep the weight and visibility down and be able to feed it
8X-LL at the legal limit. I fear just operating the 80 meter band below
3.7 will give too high a voltage with SWR . The 8X will run from the
feedpoint back yo the remote switch. From there in it will be either
LMR-400, or BuryFlex
Thanks for putting up all this information Jim. I often wonder how many
hours you have invested in these tutorials.
I've done some technical writing, mainly with and on computers and
computer systems with my last job, so I have a vague idea.
73
Roger (K8RI)
On 6/18/2016 Saturday 8:28 PM, Jim Brown wrote:
On Sat,6/18/2016 4:55 PM, Hans Hammarquist via TowerTalk wrote:
Maybe two very thin wire with thick insulation wound around a large
ferrite could do. You can use a wire pair for 50 - 75 ohms so why not
something similar but getting around 200 - 400 Zo on the wire. Any
ideas?
I have published extensively on this. k9yc.com/RFI-Ham.pdf
73, Jim K9YC
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73
Roger (K8RI)
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