[QRZ.com via rec.radio.info Admin]

Antennas, Feedlines, Towers & Rotors

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Tuner SWR or Transceiver SWR?

Posted: 27 Feb 2017 01:35 AM PST
http://forums.qrz.com/index.php?thre...er-swr.555532/

OK... Heres my question. When I tune up for highest output power, lowest
reflected power using the meter on the tuner itself and get a 1:1 swr, then
the swr meter on my transceiver a 1:3+ reading. If I tune to see a 1:1 on
the transceiver then I see a high swr on the tuners meter. Which swr
reading should I pay attention to when tuning? I use a yaesu ftdx3000 and
a palstar AT5K.

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Best type of co-ax to bury sub-soil?

Posted: 27 Feb 2017 12:41 AM PST
http://forums.qrz.com/index.php?thre...b-soil.556929/

I want to erect two beverage antennas, for reception on LF and one LF
antenna for TX. What are the best types of co-ax to bury sub-soil and not
deteriorate too much? Being LF might help keeps cost down, but the TX one
would have to be co-ax able to handle a kilowatt or more. Runs would be 50
meters or so for the RX one and 100 meters or so for TX. Thanks.

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How to avoid climbing a tower

Posted: 26 Feb 2017 10:45 PM PST
http://forums.qrz.com/index.php?thre...-tower.557060/

Hello,



I have to admit I am scared of heights. I cant climb 40ft up a tower.



I have a 40 ft tower I want to put up for my tribeam.



When I put it up we are going to tie a rope to the top, tip the tower up to
a 45 degree angle from the ground and then pull the tower up with the rope
the rest of the way.



My question is this.



Is there a way to permanently attach a cable at the top of the tower to
raise and lower it w/o someone (after it is up) climbing the tower and
attaching another rope...



How to avoid climbing a tower

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Which antenna for my situation

Posted: 26 Feb 2017 05:48 PM PST
http://forums.qrz.com/index.php?thre...uation.556924/

Hry folks.

Im a relatively new technician sitting for my general in March. So Im
researching HF antenna setups. My QTH is a two story town home community.
Roof tops are about 20-25 feet. I CANNOT put up anything permanent and do
not have access to the attic. I DO have mgmt permission to put up an
antenna while Im operating but have to take it down when done.



So Im trying to figure out the BEST antenna setup for my situation. Im
thinking I know the answer but would love to hear from...



Which antenna for my situation

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Questions about old qrp tuner

Posted: 26 Feb 2017 04:01 PM PST
http://forums.qrz.com/index.php?thre...-tuner.557002/

A few years ago i picked up a box of electronic parts at a local hamfest
for $5 One of the items is a qrp long wire tuner It uses an 1 gang of a
variable cap possibly from an am, fm. radio it measures 38 to 450 pf. The
coil is wound with 50 turns of 22 gauge solid insulated wire on a piece of
1 1/4in. dia. phenolic 3.5 in. long, tapped at 3, 10, 20 and 30 turns.



I have both a mfj 259 and an swr meter. How can i determine what bands
this will work on. I just bought a Bitx40 and would...



Questions about old qrp tuner

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What balun is this?

Posted: 26 Feb 2017 03:31 PM PST
http://forums.qrz.com/index.php?thre...s-this.556925/

Here is a couple of pictures of what I think may be an end-fed balun--but
thats my guess. No markings on the box.



All I can tell, there are two torroid cores, maybe 2-3" in diameter, with 3
wires wrapped around them. There are a couple of zip ties on the wires,
but I see 5 total windings. Looks like a ground on one winding goes to one
post, and another ground goes to another post. If thats what I recall
about end-feds, there is usually a counterpoise/ground connection, and
the...



What balun is this?

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Who makes this foldable antenna tripod?

Posted: 26 Feb 2017 02:12 PM PST
http://forums.qrz.com/index.php?thre...tripod.556968/

I have seen it for sale at Hamfests in Az, but cannot find any info about
it. I saw it used while camping at the Yuma hamfest about a week ago.



It has some capacitor plates ostensibly to improve ground coupling.
Standard 3/8-24NF thread stud to accept a Hamstick or Outbacker





View attachment 352280



View attachment 352281





WA7ARK

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EZNEC Radial field modelling

Posted: 26 Feb 2017 12:55 PM PST
http://forums.qrz.com/index.php?thre...elling.554671/

Hi,

I have a garden with space 25M x 5 M.

I want to model a 1/4 wave vertical on that radial field (WITH 120
radials) using EZNEC just t see if its worth the effort.

Is there an easy way or tool to set up the radials without working out each
end point using trig?

I see it can be done easily for a circular radial field but I dont know for
a rectangular one.

Iain G4SGX

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Vibrating ropes

Posted: 26 Feb 2017 09:36 AM PST
http://forums.qrz.com/index.php?thre...-ropes.556622/

Ive got this 50 rope up to a tree just outside the bedroom, it goes over a
tree branch and the other end comes down to a 15 lb rock. I keep it tied
off to the deck railing, and it always tightens up with the branch swaying
and all even though Ive got the rope going over the branch with a piece of
irrigation tubing. When it gets tight, it starts singing like crazy in the
wind. Ive tried tying it in places to a close by pipe, but all that does is
change where it vibrates from. How do I...



Vibrating ropes