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Messages - The Radio Shop

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1
CB Radio Repair manuals and documentation / Re: CB Tune up mauals
« on: February 06, 2021, 09:07:36 PM »
You are welcome

2
Manuals / Re: Mfj9406
« on: October 18, 2020, 07:04:53 AM »

3
Electronic Video Blog / Re: #79 Eico Model 147A Repair and Test
« on: October 18, 2020, 07:03:18 AM »
You can use either.
I get my caps from Just Radio

4
Thanks,
I could not stand seeing that scratch. So removed the front panel, sanded and repainted it.

5
Electronic Video Blog / Re: #118 Yaesu FT-2800M No Power On Repair
« on: August 22, 2020, 07:08:00 PM »
That sounds like the RF final amplifier transistor is out.
This is a RF module. Sometimes the ceramic substrate cracks.  You can remove it, take the plastic case off and see if you can see a crack.

Have a look at this page for an example.
https://www.rftechnology.com.au/downloads/EB0405.pdf

6
Power supply has started. I decided to go with solid state. This is because the extra voltage is needed for more power out of the transmitter.

7
Started the power supply.

First thing I did was build the tube rectified circuit on the breadboard. We ended up with about 190 volts on the B+.
Now we know the transformer is 250 volts but this is what happens when you use tube rectification.

EDIT TO ADD PICTURES


I then built up a solid state  circuit.  But this time we get 390 volts on the B+ and a tap for the preamp at 190 volts.
Remember this is unloaded. No load on the supply.

EDIT TO ADD PICTURES

9
In this thread we will be documenting "The Pine Board Project".
Ours will be in a metal chassis.

See link below to Bob Heil's website on this for more videos and documentation.
https://heilhamradio.com/amateur-radio-post/the-pine-board-project/

All credit for this goes to Bob Heil and his team on building this project.

10
New member welcome / Re: Greetings!
« on: June 21, 2020, 07:08:17 PM »
Hi  and welcome.

Tell us a little about you followed by what information you are seeking.

11
Test Equipment / Re: Output N Connector bracket for HP 8656b
« on: May 16, 2020, 04:12:04 PM »
Dave,
I have neve found any of those. I made mine.

12
Electronic connection / Re: yaesu ft7250 error message on transmit
« on: February 20, 2020, 07:11:40 PM »
Not good. The microprocessor in those things are so touchy.  Going low volt did not corrupt the radio. it was the surge from the jump start. But you probably knew that.

Being that I have not serviced many of these I also know way to restore the cpu other than factory return.

13
Ham Radio Circuits and Repair / Re: HTX-100 repair
« on: February 06, 2020, 02:16:59 PM »
First welcome to the site.

This sounds like a known issue with the radio in question.
Have a good look at the PLL board.  It is the smaller board sitting in the can that is attached to the chassis on one side.
You will need to unplug this board and remove it from the mount. Look closely for weak solder joints. They are there.
Also look for Sony Bond glue. This is a beige color glue that was used to hold parts down.  It has probably turned dark brown by now.
This stuff is very conductive and causes shorts.

I understand what you said about the capacitors.  But to be really sure you have to remove them and see if they leaked onto the board.

You can get the service manual here:
http://www.cbradio.nl/realistic/Service_Manual_Realistic_HTX100_Homer_ENG.pdf

Let us know what you find.

Buddy

14
New member welcome / Re: Newbie Notification
« on: February 01, 2020, 03:54:55 PM »
Welcome to the forum.
Thanks for the intro. Sounds like you been around the block quite a bit.  I always love hearing others story.
So thanks for sharing that.

The forum has a lot of members, but slow to post.  Seems no one wants to engage is good electronic talks and rag chew on the forums anymore.  A bit different from the big forums where they start shouting " get off my lawn" lol.
Anyway I am trying to get this place back up and running so sit back and have fun.

Great meeting you.

Buddy

15
Vintage Ham Equipment / Re: Swans
« on: February 01, 2020, 03:49:28 PM »
Nice set up.
Not only Swans but I see a lot of the same equipment I have.

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