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Recent Posts

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21
Military Radios / Re: Man Pack Handset Question
« Last post by DC8KH on September 13, 2018, 03:44:37 AM »
Well, Gil,

there are much more different plugs available than what you describe - the U-183/U type.
It depends on  the age of the handset, the manufacturer, the country of orign and type of radio where to connect it.
Your RT-320 radio handset has a different connector than your Racal handset, right ?
22
Batteries & Solar / Universal Battery Charger
« Last post by DC8KH on September 13, 2018, 03:32:06 AM »
Hi folks,
what type of battery charger do you use for your portbale radios?  I've tested a lot of commercial available battery chargers over the years and came to the conclusion that most of them are more or less garbage.  We can divide them in two groups :  One of them will not fully charge the batteries, while the other one will broil the batteries.
If you have different batteries for different radios to charge, you often end up with several different chargers for your radio.  And how you will supply these chargers in case of SHTF?

I dealed a long time with this problems and decided to find a solution.   I am a professional elerctronics engineer and not one of the self-styled specialists you can find everywhere - especially in forums and the well known social media channels. So I decided to develope my own charging system that solves all the problems. The system is in service now since several years and in some number and charges all my batteries, regardless of chemistry, voltage and capacity. If someone is interested we may discuss the project in depth.  But please - no idiots!

Regards,
H.
23
Net Activity / Re: Global Radio Relay Network
« Last post by RadioRay on September 08, 2018, 12:56:39 PM »
I must say, RRI is quite impressive on the Morse side!  I have had not direct contact with the digital side, though I know one or two familiar operators there, and they have always top notch, so they likely are doing great work to make a PRACTICAL EmCOMM system. . 

The Morse traffic nets are very well organized, routing has obviously been the subject of much thought and improvements, since the days of the Trans Continental Corps (TCC) and enhanced with excellent upper eschelon management of the system.  I do not see ANY public politicking , and I plan to become rather deeply involved in RRI.

Without mentioning  it at the time, one of my check-ins was QRP (5 Watts) : It worked with no problem - so, it's practical at easily sustainable , emergency power levels.

de RadioRay ..._._

24
Military Radios / Re: PRC-351 First Impressions, Compared to Modern Handhelds.
« Last post by W5IJH-Jeff on September 05, 2018, 09:47:29 AM »
Just received my PRC-351 last night. Haven't had time to get it out in the field to try it out but will do so this weekend. Definitely a solid little rig. I'm going to look into get a PRC-350 as well. I can see the 351 being a camp radio and the 350  being a patrol radio. Played around a bit and hooked up a field telephone to the 351 using Intercom mode. Pretty slick setup.
25
Antennas / Re: Best Antenna for MTB3
« Last post by gil on September 05, 2018, 05:28:30 AM »
Hello,

Yes, the difference is the size. The 240-43 is a bit more efficient but much bigger. I use the 140-size. No tuner needed on 40/20m, maybe on 30.

For my MTR is use this to check SWR:

https://qrpguys.com/tuning-indicator

If the LED is not full-bright, you're ok.

Gil.
26
Antennas / Re: Best Antenna for MTB3
« Last post by galbizua on September 04, 2018, 09:49:51 PM »
Thank Gil !!

I have a doubt you say FT-140-43  but in the picture es FT 240-43.

Supourse that de only diference is the size ?

Don't need tuner?

Thank you
27
Antennas / Re: Best Antenna for MTB3
« Last post by gil on September 04, 2018, 01:07:44 PM »
Hello Guillermo, and welcome  :)

Get an FT-140-43 toroid core and a 100pf 3000V capacitor, some 1mm enameled magnet wire...
Use a 67ft antenna wire.

Then see the photos below:





The box above is a Hammond 1594B.

Gil.
28
Antennas / Best Antenna for MTB3
« Last post by galbizua on September 04, 2018, 12:19:10 PM »
Hy, Guillermo, CP6GA from Bolivia.

I bougth my MTB3  and I need the fiel antenna 20-30-40.

Please recomend me all the kit  in especial Antenna, tuner, etc. I am a beginer.

I see de LNR Precision MTR but expensive

I want a low cost and practic equipment for the jungle, river, etc

Tkank
29
Morse Code / Re: Can Morse Code Still Save You?
« Last post by Sparks on September 04, 2018, 08:49:12 AM »
Radio Relay International  after action report on exercise contains useful information about QRP CW for emergency communication.
http://radio-relay.org/wp-content/uploads/2018/05/RRI-2018-Q1-and-Q2-Exercise-Evaluation.pdf

In that PDF I found this:

Quote
The RRI cycle of quarterly exercises is designed to test specific assets and methods in a sequence leading to more complex scenarios. This first quarter exercise was designed to test radiotelegraph circuits, whereas the second quarter exercise, for example, was designed to test two digital networks.

In the case of the first quarter exercise, it should be noted that radiotelegraphy (CW) is an extremely effective mode for portable, forward-deployed high frequency communications. It offers minimal DC power consumption, elegant equipment simplicity, light weight, few failure points and a capacity to clear a higher volume of message traffic than voice methods, often at a ratio of three to one in a given time- period. With the emphasis on battery power and renewable energy schemes, the use of CW circuits was the logical mode selection for this exercise.

Three frequencies were assigned for use in this scenario:

7115-kHz
10115 kHz
14115 kHz

These are the default RRI watch frequencies (QSX) for the CW mode. In addition, they are specified priority circuits for use during a communications emergency.

Are these three frequencies agreed upon elsewhere than in a "Radio Relay International" context?
30
Net Activity / Re: Global Radio Relay Network
« Last post by RadioRay on September 03, 2018, 10:36:08 PM »
Radio Relay International  after action report on exercise contains useful information about QRP CW for emergency communication.

http://radio-relay.org/wp-content/uploads/2018/05/RRI-2018-Q1-and-Q2-Exercise-Evaluation.pdf

See You On The Radio -

de Ray  ..._ ._
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