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Recent Posts

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91
Radio Reviews, Questions and Comments. / Re: Got my 1st CW rig
« Last post by solaris0121 on December 18, 2018, 11:39:30 AM »
Ive sold the mtr-4b on Ebay and swapped it out for a used You Kits Hb1b.    the mtr-4b is a nice radio, but it cant take more than 12volts DC input power, which limits its use in the car or in an emergency.   The hb1b has the same bands, but also adds SSB receive across 80m band through 20m which is a real plus too.   Add to that an internal battery (that seems to last for ages) and the fact that it was 100 cheaper than the one I just sold and its a win win.
92
https://qrp-labs.com/qsx.html
I'm officially excited - I emailed Hans at QRP labs about current draw - although he wouldnt commit to an answer he did say he was working on getting it as low as possible.

The perfect prepper radio ?
93
Antennas / making a 40 to 10 end fed half wave resonant on 80m ?
« Last post by solaris0121 on December 18, 2018, 06:01:11 AM »
Ive been thinking (dangerous I know !)  - I'd like a QRP portable end fed halfwave thats reasonably short - so the 40m band to 10m band ones seem perfect for when I'm out camping and hiking (being about 20 metres long).   Very manageable and easy to sling up over a tree or with a mast.   But I also really want to be able to work 80m as well.......  So now Im wondering is there a way to get a 20metre wire resonating on the 80m band ?

Maybe a bypass switch on the feeder box that ?  maybe a coil that can be switched into the circuit.   If the end is high up wired to a tree then the match box will be closer to the radio, so flicking a switch is quite easy.  So , over to you technical bods to discuss the possibilities !!!  I dont mind a bit of higher SWR, as long as its about 2.5:1 or lower, I can fix the rest with a z match tuner.   Interested to hear your thoughts if something like this is possible.

 
94
Net Activity / Re: VMARS Net, France to England.
« Last post by Ningsopida on December 17, 2018, 03:12:41 AM »
I have read the content and feel that this is a new knowledge I never knew before. This is a very useful knowledge.
95
DMR Radio / Speaker mic for amateur radio
« Last post by Cherry on December 16, 2018, 09:33:40 PM »
#Ailunce #HD1 Speaker Mic #H103ML IP55 Test With model #HD1 #RT87 #RT83
Check: https://www.youtube.com/watch?v=2tphBzA0aGY
96
Antennas / The Yagi Ailunce Antenna
« Last post by Cherry on December 16, 2018, 09:32:17 PM »
The Yagi Antenna model #AY01 Brand #Ailunce
Support: 400-480mhz
Know more: https://www.retevis.com/ailunce-ay01-yagi-antenna
https://www.youtube.com/watch?v=iIu_Vnth9uI
97
Military Radios / Re: PRC320 - RT320 RECEPTION PROBLEM
« Last post by Sam Smith on December 13, 2018, 01:44:22 PM »
Your English is very understandable-No problem here! Sounds like the PTT Relay circuit may have issues. Do you have any schematics of this radio? If you are handy with a soldering iron you might want to heat it up-First, check with an ohm meter to see if you have any opens / shorts that should not be there and carefully remove shorts or poor solder joints which may look open or which reads higher than it should.

Take note of any burnt smells or signs of circuit damage.

You may want to clean the inside circuits with alcohol or a mild detergent soap - don't use anything with Bleach if the chassis is aluminium as it may react and damage your radio. (Use your judgement or test with a cotton swab first)

Check the wiring to see if that circuit may have an open in it or if that wire needs replacing.

Also, check to see if any switches may be dirty or damaged (Ceramic switches can be damaged if the radio has been dropped - especially on the shaft or the knob(s).

In your search a good visual inspection of the radio (inside and out) might provide some answers.

In summary:

1) Visually inspect the radio; any apparent damage? Cracked knobs or panels?

2) Take the whiff test and check for burnt smells.

3) Clean the inside with alcohol and or mild detergent soap - make sure you rinse with water or alcohol and get any trash out. Also, check for burnt traces or wires.

Trouble shoot using the schematic but use the rule of thumb that says: "If it ain't broke - don't fix it!"

ZERO the ohm-meter before you use it to avoid erroneous conclusions! Been there! Done that!

Ask for advise from hams who have experience with this or similar radios (This is a great place to start!)

Lastly, share your findings with us here - I know I'd like that - others might too!

Best wishes to you friend - 73!

 
98
Military Radios / PRC320 - RT320 RECEPTION PROBLEM
« Last post by gianmo1995 on December 13, 2018, 02:17:16 AM »
Hello everybody.
First of all, forgive me for my poor english.

Today I'm here to ask you help for a problem I have with my PRC320. I searched everywhere about it, but never heard of.

Well, my PRC works just fine. It turns on, speaker ok, ATU ok, fine reception, CW filters working, full power output.
As soon as i press the PTT it transmits, but when i release it, the PRC remains silent, not switching back to reception. It's like I'm still holding the ptt, but it don't output power (neither in SSB or CW). The only thing I can hear is a really low volume note (like the one you hear when the band selector switch is in the wrong position, but with a very low volume output).
To solve this situation I have to play with all switches, sometimes to turn more and more on and off the prc. After some switch-playing the PRC switches back to reception, but 9 times over 10, as soon as i try again to transmit, the problem pops out another time.

Has someone experienced this issue? Can someone help me?

Many thanks everyone, best 73's
99
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
100
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
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