ARRL

WD6EJN

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
HTX-202 back up battery Mar 22nd, 20:49 4 117 on 30/3/16
ghz frequency loop yagis Feb 9th, 00:53 6 194 on 19/2/16
Using wi-fi routers ("mesh system" 2012? qst) Oct 3rd 2015, 19:07 1 372 on 3/10/15
question about wi-fi routers Aug 15th 2015, 23:28 4 611 on 27/8/15
ghz loop yagi calculator Aug 15th 2015, 23:15 2 329 on 16/8/15
Local Eoc (in case the web goes down) Round The Block Net Need Dirt Cheap Wireless Microphones! Jun 16th 2015, 21:34 5 469 on 6/7/15
Resistors as Chokes Jun 9th 2015, 18:01 3 434 on 9/6/15
Analog Atomic Wall Clock With Silent Second Hand No Battery May 19th 2015, 19:35 5 781 on 11/6/15
Linked Routers Jan 8th 2015, 00:13 2 509 on 4/3/15
Cross Band Balloon/Kite May 20th 2014, 22:08 1 765 on 10/6/14

Latest Posts

Topic Author Posted On
HTX-202 back up battery WD6EJN on 30/3/16
It's not the battery!
When I opened the case the first thing I did was check the (second battery I replaced with a holder 8 years ago) voltage which was 3.01v and the + battery lead looked soldered.
Since the battery was ok it must have been something else.
I had to pull the shield up to look under as I thought the + lead must be broken.
I couldn't get the shield loose as the tiny sheet metal screw was blocked by the ptt button GLUED! in place.
With the new battery (3.5v no load) in place I couldn't get the screw that holds the speaker and the shield on tight.
Unless the factory battery was attached elsewhere then soldered to the shield as I had done, this caused an intermittent over the years.
There was even a plastic tape insultating the shield from the ground!
I could not get the screw under the ptt switch so I left it out.
I placed a star washer between the speaker mount and no 4 sheet metal screw.
I almost had a heart attack when the display went on indicating 144mhz! after what I had been through.
I think soldering the negative lead to the rf shield (unless I did this) was a factory goof.
HTX-202 back up battery WD6EJN on 22/3/16
I recently got the message er-2 on my Radio Shack htx-202 handie talkie.
I assumed this was the same message I got 8 years ago and changed the memory backup battery.
When I replaced the battery I got the message in the window er-1.
Perhaps it wasn't the battery.
The manual was stolen out of my storage locker some years ago so I had no instructions on how to turn the radio on again.
I fear the tiny wire connecting the battery under the lcd display is broken and there is no way to fix it.
I tried every thing, holding different buttons and turning radio on, holding buttons the placing battery on base.
It appears toast! I can't believe it I have had so much luck with this radio over the years.
ghz frequency loop yagis WD6EJN on 19/2/16
Quote by W1VT

http://g3jvl.com/programPages/loopQuad.php
Here is a downloadable program. As I recall, he is the first one to come up with a design that worked well--and called it a Loop Quad rather than a loop Yagi, though hams in the USA would call his design a Loop Yagi.

Zack W1VT



With the exception of a qst article some year back a loop yagi for Wi-Fi made out of key rings!
I notice most of the loop yagis above 1296 are just metal discs.
As one goes higher in frequency loops made from wire become inconvenient.
I wonder if the gain goes up (besides bandwidth) when metal disc are used? capacitance would be an issue and wonder if the disc elements should be mounted perpendicular to each other.
I have seen loop yagis where this was done, this may have been for static collection on a weather station, rather then an antenna.
Also, measurements using my common tape measure and calculator are becoming obsolete, maybe this is why it is so rare to find this information, actually I found inches to be more accurate then metric, as it is easier to estimate the final value, remember measure ten times and cut once!
I also can't find if these are attached (brazed, soldered) to the boom, which would dictate the antenna would not work if the boom went through the center.
ghz frequency loop yagis WD6EJN on 16/2/16
Thank you for this!
maybe because he is/was british the lengths make less sense to me.
I had to stare at it for almost an hour.
I wish it just had diameter (circumference devided by pi)) rather then making me believe that I have to apply (cf correction factor?) the linear yagi lengths to it.
The old yagi and quad calculators gave director lengths and wire lengths and lengths of one side of the quad or all the way across.
Some time ago I tried to build a quad antenna in my mom's living room as I had to live there too, I couldn't get it to work (as with most of my work) and think it was the wire I used, which was very cheap tin plated copper art wire as I couldn't afford or find copper weld.
This suggest cutting the linear lengths, then with cut & try forming them into loops, it doesn't seem to include the impedance once the loops are shorted at the ends.
This is all I could find in my searches too, at these frequencies there is no room for error, it's too bad there isn't one more category that lists diameter or radius.
ghz frequency loop yagis WD6EJN on 9/2/16
Some time ago I built several two meter yagi and quad antennas from yagi and quad calculator sites.
Every parameter was there for me to input such as gain diameter of elements and length of boom etc etc.
Why is it so hard to find a loop yagi (look like key rings) calculator for the bands above 70 cm or so?

Back to Top