50 ohm full wave loop

[707ways2Sunday]

No matching network required. Not often that I string some wire and the first cut lands on target. This one did and I will take it.

36’ 8” of 14awg stranded insulated wire with a DIY 1:1 current Balun. Oriented vertically horizontally polarized. About 13’ AGL to the feed point.

talking pretty good this morning.

 

[707ways2Sunday]

At the feed point

 

[707ways2Sunday]

The results!!!

 

[prcguy]

At the feed point

What core material did you use? I think you would be better off with a simpler version using 8 turns of RG-58 or RG-142 around an FT-240-61 core, that is about the best choking performance you can get with a single core. You have what looks like a bifilar wound version and some insulated wire like speaker or power cable is lossy as a transmission line when wrapped around a ferrite.

 

[Chris155]

That’s cool. How does it perform in comparison to other base antennas you have used?

 

[707ways2Sunday]

What core material did you use? I think you would be better off with a simpler version using 8 turns of RG-58 or RG-142 around an FT-240-61 core, that is about the best choking performance you can get with a single core. You have what looks like a bifilar wound version and some insulated wire like speaker or power cable is lossy as a transmission line when wrapped around a ferrite.

Think it’s 31 I had it from another antenna experiment. The wire is 18awg high temp 150 strand tinned copper. 600v 7.5A

 

[707ways2Sunday]

That’s cool. How does it perform in comparison to other base antennas you have used?

Thanks, performs real well for DX. Locally does OK when I talk to locals with horizontally, polarized antennas. Hard to say with DX comparing it to other antennas because conditions can change within seconds. Sometimes it has increased my signal significantly over my Sirio 2016. It’s on the ground now because I’m getting ready to put it up a little higher. It was only 13 foot to the base of it with all the testing. I’ve done so far. Receive it excellent. Gain is supposed to be like 2DB over dipole or 4.1 to 4.2 DBI. But that’s at it’s optimal height, which I have no idea what that is because I didn’t model it.

 

[slowmover]

“ . . which I have no idea what that is because I didn’t model it.”

Ahh, yeah, “the model” . . . forgot to count the beers consumed prior to erection, then lost count again after the huff’n puff of getting it leaned against the garage.

Start with a fresh six pack, hand.
Like an unopened deck of cards.
Right tool use will equal right model.

.

 

[prcguy]

Think it’s 31 I had it from another antenna experiment. The wire is 18awg high temp 150 strand tinned copper. 600v 7.5A

A single 31 mix FT-240 core with 9 turns bifilar (what yours looks like) targets roughly the 4 through 16MHz range and is not very effective at 27MHz having about 1k of reactance and no resistive (absorptive) properties. I don't find any combination of windings that are very good on a 31 mix core for 27MHz.

A single 61 mix with 9 turns of coax seems to be the most effective targeting the 26 through 30MHz range with about 8k ohms of resistive choking. Here is a lot of info on various ferrite mixes and choking over various frequency ranges. Otherwise, nice work on the antenna!

Common-mode chokes

Photographs of a copy of the Ten Tec Argosy transceiver

www.karinya.net

 

[slowmover]

This is the 2017 revision to the original 2012.

At feedpoint:
(I’ve had to put off radio-related purchases this past year);

— Am currently thinking to use RG316 on FT240-61 X 12-turns as it winds tightly unlike RG58. (This will replace earlier, bulkier choke).

At transceiver:

CMC-130S-3K 1-30MHz – MyAntennas.com

Treating both ends of coax worth the $ in my mobile experience.


.

 

[prcguy]

View attachment 177793

This is the 2017 revision to the original 2012.

At feedpoint:
(I’ve had to put off radio-related purchases this past year);

— Am currently thinking to use RG316 on FT240-61 X 12-turns as it winds tightly unlike RG58. (This will replace earlier, bulkier choke).

At transceiver:

CMC-130S-3K 1-30MHz – MyAntennas.com

Treating both ends of coax worth the $ in my mobile experience.

View attachment 177794
.

Someone needs to get to the bottom of the conflicting info, but whatever gives the best performance in the CB band is obviously the goal. RG-316 will handle quite a bit of power and the length used around a toroid is not enough to cause a loss problem. A single FT-240 core should be ok up to about 400w SSB, less on AM or FM.

 

[slowmover]

FT240-61 & RG316

Second set of tests on Mix 61 (below the graph in the link); 2017 revisions to 2012 original (new graph in my last)

Common-mode chokes

Photographs of a copy of the Ten Tec Argosy transceiver

www.karinya.net

There’s yet more elsewhere (came across links on QRZ and on radio websites); this one, usually:

http://k9yc.com/2018Cookbook-Pacificon2021.pdf

RG142 & 400 “can be wound once” more tightly than recommended (bend radius), but I figure the vibration associated with mobile precludes that choice. Versus a base station the coax run is quite short. As RG316 is used in aviation this made the choice seem better.

What I kept coming across was that the ideal involved the coax being wound tightly, especially across the center.

The OP was using wire and with a much longer coax run.

.

 

[707ways2Sunday]

A single 31 mix FT-240 core with 9 turns bifilar (what yours looks like) targets roughly the 4 through 16MHz range and is not very effective at 27MHz having about 1k of reactance and no resistive (absorptive) properties. I don't find any combination of windings that are very good on a 31 mix core for 27MHz.

A single 61 mix with 9 turns of coax seems to be the most effective targeting the 26 through 30MHz range with about 8k ohms of resistive choking. Here is a lot of info on various ferrite mixes and choking over various frequency ranges. Otherwise, nice work on the antenna!

Common-mode chokes

Photographs of a copy of the Ten Tec Argosy transceiver

www.karinya.net

Great resource prcGuy thanks for sharing it!!

 

[707ways2Sunday]

Someone needs to get to the bottom of the conflicting info.

There is a lot of it out there.

 

[slowmover]

There is a lot of it out there.

There are those who say they’ve updated past the 2017 info.

.

 

[707ways2Sunday]

There are those who say they’ve updated past the 2017 info.

.

There are almost an infinite amount of combinations to test. So many variables for each individual set up that testing results with all present conditions in place is likely the only conformation we can get. I still haven’t ventured into testing the attenuation of anything I’ve wound. My VNA will do it I believe. I have tested transformers I have wound to make sure they will do what they are supposed to do.

Just the nature of the beast I suppose.