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Recent Posts

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12
Morse Code / Re: Morse using Inexpensive Stations
« Last post by 9a3iv on November 10, 2018, 10:57:25 AM »
Anybody tries VK3YE tiny toy or bigger toy?
13
Antennas / Re: Windom Antenna Analysis With The MR100.
« Last post by Wingfoot on November 10, 2018, 05:37:06 AM »
I have been given an ocfd to try by a friend, it one made by M0CVO it's the HW-40HP model, I've not tried it yet but finding this thread has been helpful & I'll use some of the tips here when installing it, I'll let you know how it goes.

73
Wf
14
Radio Reviews, Questions and Comments. / The biggest promotion on Retevis RT82
« Last post by Cherry on November 07, 2018, 04:41:03 AM »
Retevis RT82, dual band DMR dual-mode amateur radio.
Non-GPS: Buy 1 get 1 free.
GPS: Save $80 Instantly
This pecial offer only can be used here: http://bit.ly/retevis_rt82_discount
15
Radio Reviews, Questions and Comments. / Re: Cross-band repeater function radio RT23
« Last post by Sparks on November 06, 2018, 08:30:34 PM »
Also check this post:

Hello everyone, would you want to reivew our handheld radio? We need the influencers to review and make  videos for us on youtube!

If you have youtube and with more than 1,000 subscribers, and the important is your are a ham, you have the experiences on review amateur radios. please contact me by email: partner@retevis.com
We can talk about the details for review.
16
Also check this post:

This radio is a dual band Analog radio, it has a special function cross-band repeater.
Gil took a video to explain this function, and how to use this function, please check here:https://youtu.be/Tr5HYjwKi8g

If you want know more about this radio, please check here: https://www.retevis.com/rt23-cross-band-repeater-dual-ptt-walkie-talkie
17
Radio Reviews, Questions and Comments. / Cross-band repeater function radio RT23
« Last post by Cherry on November 06, 2018, 02:02:16 AM »
This radio is a dual band Analog radio, it has a special function cross-band repeater.
Gil took a video to explain this function, and how to use this function, please check here:
https://youtu.be/Tr5HYjwKi8g

If you want know more about this radio, please check here: https://www.retevis.com/rt23-cross-band-repeater-dual-ptt-walkie-talkie
18
Hello everyone,
would you want to reivew our handheld radio? We need the influencers to review and make  videos for us on youtube!
If you have youtube and with more than 1,000 subscribers, and the important is your are a ham, you have the experiences on review amateur radios. please contact me by email: partner@retevis.com
We can talk about the details for review.
19
Antennas / Windom, or OCFD?
« Last post by KQ4BX on November 03, 2018, 08:52:35 PM »
A Windom is another name for the Off Center fed dipole. I have been using one for years, and they are fairly simple to make. My OCFD  gives amazing performance, but that was no accident. I did a lot of research before making an OCFD that worked so well, that many of my friends made one after trying mine.

Some things to know about the OCFED are that the height of the feed point  determines the BALUN needed. The most common BALUN would be a 4:1 current BALUN. The 4:1 works best if the height of the feed point is 35 to 45 feet, or even 50 feet. If you go any higher, the BALUN may need to be adjusted.

The second thing to know, is that ground radials below the antenna, will help tremendously, or i would say they are essential for a well working OCFD.

The ground radials can be place in the ground, just cut a V in the dirt, and place the radial into it and cover it up. The radials should be grounded to your station ground  point. In my case, that is several ground steaks around my tower, and a short connection to the well pipe that is  very close to the tower leg. 

You MUST also connect your home ground to the station ground , if you don't, you will create a dangerous situation for lightening strikes that will hot one ground point, then run through your home toward the next ground point, blowing out everything in between.


Lastly, the 4:1 BALUN I originally made did not work so  well. I was not an expert at making BALUNS, but I followed  directions very well. After a lot of testing and not getting what I considered good performance, I called  BALUN DESIGNS by getting their number off of their website.  I spoke to Bob, and Bob explained a few things to me, and suggested that i try on of his 4:1 BALUNS that was made specifically for an OCFD.   It was rated for 5KW, and had a duel core. Mine was not anything like that.   That BALUN Designs BALUN was the first step in getting an OCFD that worked pretty well. The next improvements came later. one was the height of the feed point went higher, and the next was the ground radials   My OCFD is now amazing, and tunes from 10 to 40m, only skipping 30M. It has flat SWR across 12m, and gives me nice working spots on each band that do not need a tuner. I do use a tuner to widen some of the bigger bands, like 40m. I also can tune to a small section of 75M.  Low low you can go, is alls about the total length of wire you are working with. I work with roughly 45'x90' , but if you have more room, you can double those lengths, and  do much better. My property is not that big.
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