61
How CB radio works / Cobra Radio Stuff
« on: October 20, 2010, 09:06:40 PM »
again
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62
How CB radio works / Cobra Radio Stuff
« on: October 20, 2010, 08:52:33 PM »
RF attenuator pad for generator
63
Announcements / News about the site
« on: May 01, 2010, 09:40:16 PM »
ok, the bill has been payed for another year. I was going to let it go but decided to go ahead and take care of it. So we are here to stay and hope everyone enjoys
64
Vintage Ham Equipment / National 98 trash dump special
« on: March 12, 2010, 05:20:10 PM »
So what we have here is a National model 98 receiver.
This was a find at the trash dump. Luckily I save it from a horrible death.
The whole unit is intact and no parts missing.
Now to start the restore process.
This was a find at the trash dump. Luckily I save it from a horrible death.
The whole unit is intact and no parts missing.
Now to start the restore process.
65
Home Brew And Tech Forum / 700 watt homebrew dummy load
« on: March 09, 2010, 08:10:27 AM »Quote from: JADE;17178
Hey, who did you put in that can, Reid or Pelosi?:carrot:
:arf2:
I will never tell!
66
Home Brew And Tech Forum / 700 watt homebrew dummy load
« on: March 08, 2010, 01:16:11 PM »
The finished product.
67
Home Brew And Tech Forum / 700 watt homebrew dummy load
« on: March 07, 2010, 07:24:42 PM »
Today I needed another dummy load for the other repair bench.
Went to lowes and picked up a 1 quart paint can.
For this project you will need:
1-1 quart paint can
1 SO-239
2-1 inch by 4 inch copper circuit boards
14 680 ohm 5 watt carbon resistors
4 4-40x12 machine screws and 5 nuts
1 small terminal ring
1 quart mineral oil
A few inches of stiff hook up wire
silicon sealer
Mount SO-239 in top of paint can.
Tape the 2 circuit boards together and drill 14 even spaced holes to pass the resistor leads.
Install the 14 resistors in one side of circuit board. Copper side out. Leave about 1/8 of an inch between board and resistor. Cut leads and bend over. Solder all leads
Install other side same as previous.
At this time with an ohm meter check from one plate to the other. See how close to 50 ohms you are. If you need add or subtract resistors. With 14 installed mine was 50.7 ohms. This will depend on how close the tolerance of your resistors are.
Install the small ring terminal to one of the SO-239 mounting bolts pointing out. Bend it so it points away from lid.
Next cut 2 1 1/2 inches of stiff hook up wire. Solder one to the center of the SO-239 and the other to the terminal ring . Bend wire out and then down so it is the same OD as your resistor board.
Next mount resistor board as close to the lid as you can by soldering the two wire to it.
Insert in can and check SWR with a few watts. All should be good as this point.
Remove lid and seal the bottom of the SO-239 and the 4 mounting screws.
Take a break. You deserve it. Got to let silicone dry anyway.
Come back and fill can with mineral oil leaving about 3/4 inch from top.
Re-install lid and press in good
If you have 14 resistors installed you now have a dummy load that will handle 70 watts dry for short periods. I see know reason why it will not handle 700 watts in oil.
I will do the math later to figure out watt it will handle later unless someone else wants a stab at it.
Went to lowes and picked up a 1 quart paint can.
For this project you will need:
1-1 quart paint can
1 SO-239
2-1 inch by 4 inch copper circuit boards
14 680 ohm 5 watt carbon resistors
4 4-40x12 machine screws and 5 nuts
1 small terminal ring
1 quart mineral oil
A few inches of stiff hook up wire
silicon sealer
Mount SO-239 in top of paint can.
Tape the 2 circuit boards together and drill 14 even spaced holes to pass the resistor leads.
Install the 14 resistors in one side of circuit board. Copper side out. Leave about 1/8 of an inch between board and resistor. Cut leads and bend over. Solder all leads
Install other side same as previous.
At this time with an ohm meter check from one plate to the other. See how close to 50 ohms you are. If you need add or subtract resistors. With 14 installed mine was 50.7 ohms. This will depend on how close the tolerance of your resistors are.
Install the small ring terminal to one of the SO-239 mounting bolts pointing out. Bend it so it points away from lid.
Next cut 2 1 1/2 inches of stiff hook up wire. Solder one to the center of the SO-239 and the other to the terminal ring . Bend wire out and then down so it is the same OD as your resistor board.
Next mount resistor board as close to the lid as you can by soldering the two wire to it.
Insert in can and check SWR with a few watts. All should be good as this point.
Remove lid and seal the bottom of the SO-239 and the 4 mounting screws.
Take a break. You deserve it. Got to let silicone dry anyway.
Come back and fill can with mineral oil leaving about 3/4 inch from top.
Re-install lid and press in good
If you have 14 resistors installed you now have a dummy load that will handle 70 watts dry for short periods. I see know reason why it will not handle 700 watts in oil.
I will do the math later to figure out watt it will handle later unless someone else wants a stab at it.
68
Announcements / Dan Bittleston
« on: March 03, 2010, 07:48:06 PM »
Would had been 72 years old today.
Sure miss him.
May God rest his soul.
Sure miss him.
May God rest his soul.
69
Amplifiers / Johnson Viking Thunderbolt
« on: February 11, 2010, 10:58:23 AM »Quote from: k9yli;17165
no different than other vintage amps.
all you need to put behind modern transciever is a relay to switch the input to output SO239s.
so the amp is bypassed on receive..
MY heathkit needed a bias supply but someone had already put that in..
a 2 pole 5 amp contact 12 volt coil relay will do the trick.
many circuits on the internet.
also for crazy using an amp on CB is illegal in case you were not
kidding...
Curious to the type of bias supply installed in your heatkit.
I have seen many different version around.
Agreed on the relay install. But I would never change this amplifier. I am gonna use it with my Apache.
Oh, I am sure crazy aint that crazy lol
70
Ham Radio Circuits and Repair / Heathkit Apache TX-1 restore
« on: January 24, 2010, 11:16:59 AM »
More pics
71
Ham Radio Circuits and Repair / Heathkit Apache TX-1 restore
« on: January 24, 2010, 11:12:35 AM »
Here is my lastest project to restore.
This is a TX-1 transmitter from heathkit. Made in the late 50\'s.
This is a TX-1 transmitter from heathkit. Made in the late 50\'s.
72
Ham Radio Chit Chat / My Shack
« on: January 15, 2010, 05:31:12 PM »
radios sitting waiting for room to get finished