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Posted: 2/16/2012 9:03:35 AM EDT
After seeing a reference to it in pic's thread about the ultimate manpack ham radio, I knew I had to have one. I exchanged a few emails with Yimin and ordered one. I got the 4-30 MHz version since I figured as a portable radio it's better paired with the higher frequencies hence smaller antennas so I traded 80m for full coverage of 40-10m. It's sold as a kit (or assembled for $100 more) and does 20 watts. Receive draw is 200ma and 20w CW draws a max of 8 amps.

Should be a fun project! Pics from their website:





It even has a dedicated data connector so I'm thinking custom connector terminating into two 1/8" cables + netbook = portable PSK station
Link Posted: 2/16/2012 9:18:46 AM EDT
I've been looking at this too. Have you considered the juma radios also?
Link Posted: 2/16/2012 9:18:59 AM EDT
Kit or assembled?


Keep us posted.
Link Posted: 2/16/2012 9:54:50 AM EDT
Originally Posted By piccolo:
Kit or assembled?


Keep us posted.


Kit, of course! What's the fun in something that works?

I'll do a build thread when I start it.
Link Posted: 2/16/2012 10:01:01 AM EDT
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.
Link Posted: 2/16/2012 10:03:38 AM EDT

Originally Posted By phurba:
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.

I'm just about finished with a juma rx-1. Steady hands and some good soldering equipment are required.
Link Posted: 2/17/2012 4:58:28 AM EDT
Originally Posted By kc8ard:

Originally Posted By phurba:
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.

I'm just about finished with a juma rx-1. Steady hands and some good soldering equipment are required.


There are a decent number of SMT parts in the TJ4A. I've soldered surface mount before. The keys are having a very clean and fine point on your soldering iron, magnifying goggles, and a tiny amount of superglue (applied with a toothpick) to tack down the component before soldering it.
Link Posted: 2/17/2012 10:40:39 AM EDT

Originally Posted By phurba:
Originally Posted By kc8ard:

Originally Posted By phurba:
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.

I'm just about finished with a juma rx-1. Steady hands and some good soldering equipment are required.


There are a decent number of SMT parts in the TJ4A. I've soldered surface mount before. The keys are having a very clean and fine point on your soldering iron, magnifying goggles, and a tiny amount of superglue (applied with a toothpick) to tack down the component before soldering it.

hihi, yep. There are quite a few techniques when SMT soldering is involved. That's one of the things that interested me with the Juma. I've done quite a bit of reflow rework in the past. It also helps when you have a hot air machine. Reminds me, if any arfcommers ever need to borrow a hakko hot air station, I have a spare I'll lend out for the price of shipping both ways.
Link Posted: 2/17/2012 11:02:12 AM EDT
Originally Posted By phurba:
Originally Posted By kc8ard:

Originally Posted By phurba:
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.

I'm just about finished with a juma rx-1. Steady hands and some good soldering equipment are required.


There are a decent number of SMT parts in the TJ4A. I've soldered surface mount before. The keys are having a very clean and fine point on your soldering iron, magnifying goggles, and a tiny amount of superglue (applied with a toothpick) to tack down the component before soldering it.


thought in the description they said all the SMT's were already mounted/soldered?
Link Posted: 2/17/2012 11:56:46 AM EDT
Originally Posted By mylt1:
Originally Posted By phurba:
Originally Posted By kc8ard:

Originally Posted By phurba:
Originally Posted By kc8ard:
I've been looking at this too. Have you considered the juma radios also?


The Juma is another interesting radio. It's a little more compact but only does 10 watts and costs about $250 more.

I'm just about finished with a juma rx-1. Steady hands and some good soldering equipment are required.


There are a decent number of SMT parts in the TJ4A. I've soldered surface mount before. The keys are having a very clean and fine point on your soldering iron, magnifying goggles, and a tiny amount of superglue (applied with a toothpick) to tack down the component before soldering it.


thought in the description they said all the SMT's were already mounted/soldered?


That's inaccurate. I think all of the SMTs for the display module are pre-soldered, and all of the ICs are. But there are a buch of diodes, capacitors, resistors, and a few SMT transformers that aren't soldered.
Link Posted: 2/17/2012 4:43:55 PM EDT
Let me know what you plan on doing for a handset.
Link Posted: 2/17/2012 5:04:54 PM EDT
You know, that is a nice looking enclosure. Does anyone know the manufacturer and part number for it? I bet an IC7000, battery and tuner would fit in there quite well.

Link Posted: 2/17/2012 5:09:23 PM EDT
This is relevent to my interests. This might make a good intro to HF rig.
Link Posted: 2/17/2012 5:41:09 PM EDT
Originally Posted By Jester316:
This is relevent to my interests. This might make a good intro to HF rig.


Now this being said by Mister Fucking Simplicity himself, my guess is that this is going to be a little harder to operate than it looks.

1. It comes with no speaker, hand/headset

2. I believe setting it to a certain frequency will be a little slow via buttons.

3. What do you use for a tuner?

4. http://harrisburg.craigslist.org/ele/2820821431.html by the time you get the rig delivered and it is only a 20 watt rig you have coughed up $550. The you need a power supply, a tuner, an antenna, a mike/speaker (head/hand set)

5. an IC 718 NEW is only a little more and has a better track record and 80 watts more power. This is a tinker rig for an experienced ham of which I am not.


Link Posted: 2/17/2012 6:00:24 PM EDT
Originally Posted By piccolo:
Originally Posted By Jester316:
This is relevent to my interests. This might make a good intro to HF rig.


Now this being said by Mister Fucking Simplicity himself, my guess is that this is going to be a little harder to operate than it looks.

1. It comes with no speaker, hand/headset

2. I believe setting it to a certain frequency will be a little slow via buttons.

3. What do you use for a tuner?

4. http://harrisburg.craigslist.org/ele/2820821431.html by the time you get the rig delivered and it is only a 20 watt rig you have coughed up $550. The you need a power supply, a tuner, an antenna, a mike/speaker (head/hand set)

5. an IC 718 NEW is only a little more and has a better track record and 80 watts more power. This is a tinker rig for an experienced ham of which I am not.




But each day you are becoming more and more an experienced ham.




Funny how that works.

Vulcan94

Link Posted: 2/17/2012 7:53:34 PM EDT
[Last Edit: 2/17/2012 7:55:44 PM EDT by piccolo]
Originally Posted By aa777888-2:
You know, that is a nice looking enclosure. Does anyone know the manufacturer and part number for it? I bet an IC7000, battery and tuner would fit in there quite well./quote]



Just a shot in the dark, but I'd just bet a HVAC shop could conjure up some kind of fairly weatherproof case that you could set up a manpack rig with.

Just a shot in the dark.


Stick your stuff in the car and grab a dozen doughnuts and bring it all in there. If they are not busy they'll brainstorm with you. Most guys are interested in stuff like ham radios.



Link Posted: 2/17/2012 8:15:22 PM EDT
Extra! EXTRA! READ ALL ABOUT IT!!!

The guy from youkits dot com just got back with me. He read my spec sheet and said he was going to be off somewhere for a week discussing the idea with the big bosses.

This MAY be the opportunity to get a pretty good manpack type rig at a decent price.

While you can rest assured it probably won't be waterproof or bulletproof it may be a good deal for the money.

I will keep you posted.

You might go to the website and email them expressing interest in a manpack type set like the one another member of the ham site you are on described the other day.

Link Posted: 2/17/2012 9:51:24 PM EDT
Originally Posted By piccolo:
Extra! EXTRA! READ ALL ABOUT IT!!!

The guy from youkits dot com just got back with me. He read my spec sheet and said he was going to be off somewhere for a week discussing the idea with the big bosses.

This MAY be the opportunity to get a pretty good manpack type rig at a decent price.

While you can rest assured it probably won't be waterproof or bulletproof it may be a good deal for the money.

I will keep you posted.

You might go to the website and email them expressing interest in a manpack type set like the one another member of the ham site you are on described the other day.



This is why I'm glad to have your crazy ass around.
Link Posted: 2/18/2012 3:51:59 AM EDT
Originally Posted By DOUGHERTY03:
This is why I'm glad to have your crazy ass around.




All I do is ask people if they have things.
Link Posted: 2/18/2012 4:25:52 AM EDT
Originally Posted By piccolo:
Originally Posted By Jester316:
This is relevent to my interests. This might make a good intro to HF rig.


Now this being said by Mister Fucking Simplicity himself, my guess is that this is going to be a little harder to operate than it looks.

1. It comes with no speaker, hand/headset

2. I believe setting it to a certain frequency will be a little slow via buttons.

3. What do you use for a tuner?

4. http://harrisburg.craigslist.org/ele/2820821431.html by the time you get the rig delivered and it is only a 20 watt rig you have coughed up $550. The you need a power supply, a tuner, an antenna, a mike/speaker (head/hand set)

5. an IC 718 NEW is only a little more and has a better track record and 80 watts more power. This is a tinker rig for an experienced ham of which I am not.




I'm probably going to convert a surplus military handset like in the pictures from the website. Frequency is entered with up/down buttons (pretty much like the up/down switches on a lot of military rigs) but it also has memories. Since it's a momentary contact for up/down, I'm thinking about adding a return-to-center momentary rotary switch which would work pretty much like any VFO dial, or if I felt like getting fancy I could add a little extra hardware and a rotary encoder to do the same thing. I'm planning on using resonant antennas to save weight, though Yimin told me they have an internal auto tuner in the works. Batteries are going to be small 12v SLA batteries in the 8-10 AH range.

Since the case weighs 1.5 kg and has a lot of empty space, I might build it into a smaller plastic box to save space and weight.
Link Posted: 2/18/2012 4:52:08 AM EDT

Originally Posted By aa777888-2:
You know, that is a nice looking enclosure. Does anyone know the manufacturer and part number for it? I bet an IC7000, battery and tuner would fit in there quite well.


I'm not so sure. It might fit, but I think if you restricted the air flow from a 7K and used any amount of real power, it would die of heat stroke pretty quickly...


Link Posted: 2/18/2012 4:58:59 AM EDT
Originally Posted By HomeSlice:

Originally Posted By aa777888-2:
You know, that is a nice looking enclosure. Does anyone know the manufacturer and part number for it? I bet an IC7000, battery and tuner would fit in there quite well.


I'm not so sure. It might fit, but I think if you restricted the air flow from a 7K and used any amount of real power, it would die of heat stroke pretty quickly...





That's a good point.

Link Posted: 2/18/2012 5:05:52 AM EDT
Originally Posted By phurba:

I'm probably going to convert a surplus military handset like in the pictures from the website. Frequency is entered with up/down buttons (pretty much like the up/down switches on a lot of military rigs) but it also has memories. Since it's a momentary contact for up/down, I'm thinking about adding a return-to-center momentary rotary switch which would work pretty much like any VFO dial, or if I felt like getting fancy I could add a little extra hardware and a rotary encoder to do the same thing.

I'm planning on using resonant antennas to save weight, though Yimin told me they have an internal auto tuner in the works. hopefully it will be a good one Batteries are going to be small 12v SLA batteries in the 8-10 AH range.

Since the case weighs 1.5 kg and has a lot of empty space, AFM saw the rig and opined the space might fit a tuner of some sort. Either that or batteries. I think that Yimin has it labeled as a battery boxI might build it into a smaller plastic box to save space and weight.


I wonder what Yimin has in mind when he said he might be creating one that might fit the spec sheet I sent him.

Link Posted: 2/18/2012 7:40:37 AM EDT
Originally Posted By piccolo:
Originally Posted By HomeSlice:

Originally Posted By aa777888-2:
You know, that is a nice looking enclosure. Does anyone know the manufacturer and part number for it? I bet an IC7000, battery and tuner would fit in there quite well.


I'm not so sure. It might fit, but I think if you restricted the air flow from a 7K and used any amount of real power, it would die of heat stroke pretty quickly...





That's a good point.



Well of course I would provide for ventilation!

Part number? Anyone?


Link Posted: 2/18/2012 7:55:53 AM EDT
Check out some of the Ten-Tech enclosures. They are know for making some of the best cases
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