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Recent Posts

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1
New To Radio / Yagi UHF Directional Antenna
« Last post by Cherry on December 11, 2018, 09:49:55 PM »
https://youtu.be/iIu_Vnth9uI

Brand: Ailunce

Model: AY01

Center Frequency: 430-440Mhz

Support Frequency: 400-480Mhz

Gain: 7dBi

Power: 50W

VSWR ≤ 1.2

Polarization: Horizontal

Length: 46cm (18in)

Weight: 0.19kg

Light and small, suitable for carrying. Support multiple assembly and disassembly
More: https://www.retevis.com/ailunce-ay01-yagi-antenna
2
New To Radio / RT51-An Inexpensive PoC radio
« Last post by Cherry on December 11, 2018, 08:32:21 PM »
This article was written by the US tester.
A review of the new Retevis RT51- an inexpensive Poc Alternative

The  RT51 PoC Handheld radio is a Push-to-Talk (PTT) communications tool, uses existing AT&T and T-Mobile cellular for voice signal propagation. Retevis presents it as an inexpensive communications device and platform that allows for group and one-on-one PTT communications over great distances. The radio is listed for sale on the website for only $129.00 which is very inexpensive compared to existing similar radios on the market. You can see the listing and purchase here: https://www.retevis.com/rt51-poc-handset-radio
Requirements to put the radio to work are:

1. a SIM card for at least 500MB data for each radio;
2. The software to program your radio and programming cable.
3. the admin account to manage groups and users;
4. the dispatch platform for managing all your business communications.
PoC stands for PTT over Cellular. There are a plethora of these devices and platforms showing up in the marketplace these days. They all require access to the internet, a data plan with a cell phone company and a communications server to connect to that provides the connectivity for the subscribed to services.

This is the first downside of the RT51 PoC Handset radio. It has no wifi capability. You are totally reliant on access to your provider's network. But, my testing of this radio proved that the external cell antenna on the radio does increase the range to access data connectivity. In places where I could not connect with my smartphone, I did connect with this radio. That did impress me.

The RT51 radio itself is a nice radio with a quality feel and function.

As a small group of testers here in the US, we were able to figure out how to program our radios and get them connected to our various cell networks with some frustrations. Once we got it figured out, we were able to talk back and forth over great distances easily with decent audio quality.

By the way, the RT51 has built-in GPS that accesses satellites from an internal antenna. One of the menu functions show you your coordinates and how many satellites you have accessed.

What is attractive about the RT51 and associated platform is the price. The radio is very inexpensive. You can get a data plan with T-Mobile for $10-$15 a month and the network fee is a mere $10 annually. I'd say that is pretty tough to beat when looking at other pricing structures for this kind of communications tool.

 Would I buy this radio for my business? Yes.

I am a fan of both of these very cool communications platforms and use them daily. However, if you are a communication tech, or want a radio to play with and see what you can do with it, have at it! It could be a lot of fun. I was given one as a tester. I will hold on to it for awhile and see what others can do with it in the ham community. The radio runs on Linux so if someone can gain access to it, who knows what could be done with it. I can't wait to see what the techs in the ham community will do with it.
https://www.youtube.com/watch?v=yEPMv0ZgzoY

More please visit: www.retevis.com
3
Classifieds / Re: Scanners
« Last post by Venadex on November 29, 2018, 02:05:45 AM »
We like this content a lot because it gives us more knowledge.
4
Antennas / Re: Ground Tuning Unit.
« Last post by gil on November 20, 2018, 05:50:37 AM »
Hello.

Here is another one; image attached...

Parts List:
  • Variable resistor 50k/ohm R1.
  • Switch single pole 12 way S1.
  • Capacitor variable 500pf air spaced (1mm recommended) C1.
  • Diode point contact germanium diode 1N34 OA91 D1.
  • Toroid T50-2.
  • Meter 50 or 100ma L1, M1.
  • Enamelled copper wire 1.8 or 2mm (14swg)and 0.5mm(24swg).
  • Insulated shaft extension.
  • Capacitor 10nF (103) C2.

Quote
Gil, the Mac version of the free OpenOffice suite opens DOCX files with no problems.

Yes, thanks, usually it does, but not this time, weird...

Gil.
5
Antennas / Re: Ground Tuning Unit.
« Last post by Quietguy on November 19, 2018, 06:15:18 PM »
I can only open it on my phone but not my Mac...

Gil, the Mac version of the free OpenOffice suite opens DOCX files with no problems.  I use it frequently on Microsoft formatted files, including DOCX text and XLS spreadsheet.  As long as there isn't any weird formatting or macros involved, it works fine.  It also exports files as PDF through the menu "File/Export as PDF" option.

Many people have switched to the free LibreOffice fork of OpenOffice because of a difference in "free" license terms, but LibreOffice made some UI decisions I have a hard time living with so I went back to OpenOffice.

In any event, both of these handle DOCX/XLS files and export as PDF easily.
Wally
6
Antennas / Re: Ground Tuning Unit.
« Last post by gil on November 19, 2018, 11:34:23 AM »
Thank you, much appreciated!

Gil

Sent from my SM-G928F using Tapatalk

7
Antennas / Re: Ground Tuning Unit.
« Last post by Sparks on November 19, 2018, 11:32:46 AM »
If someone could turn it into a PDF and email it to me: gil@thisdomain.com (switch thisdomain.com for radiopreppers.com). I can only open it on my phone but not my Mac...

I just emailed you the requested PDF (12 pages), converted from DOCX to PDF, made by my MacBook Pro using Microsoft Word.app from Microsoft Office Home and Student 2016 for Mac suite.

Afterwards I discovered that a somewhat earlier version is available online at this URL:

https://www.vk5pas.com/uploads/1/3/9/8/13982788/-guide_to_building_a_portable_station_complete_with__gtu__1_.pdf

That one is signed: "Alex, VK2HAS", while the one I converted ends with: "Alex, VK2HAS now changed to VK2PRC". However, they both begin thus: "Date: 06.02.2016   By: Alex Ball VK2HAS".

BTW, there are several more or less free online services to convert from DOC or DOCX to PDF, here are the five top hits in my Google search:

https://smallpdf.com/word-to-pdf
https://www.ilovepdf.com/word_to_pdf
https://www.freepdfconvert.com/
https://online2pdf.com/doc-to-pdf
https://convertonlinefree.com/

I have used the first one earlier, when in a hurry, and I just tried it with your DOCX. It worked fine, except it downloaded with about half the size of what my Word.app yielded. I guess this matters only if you need high quality printouts.
8
Antennas / Ground Tuning Unit.
« Last post by gil on November 19, 2018, 06:51:03 AM »
Hello,

Here is an interesting document on a portable station using a ground tuning unit...
If someone could turn it into a PDF and email it to me: gil@thisdomain.com (switch thisdomain.com for radiopreppers.com). I can only open it on my phone but not my Mac...
Have anyone here used a ground tuner? Comments?
Thanks to Alex, VK2PRC for sending me this file.

Thank you!

Gil.
10
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?
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