swan 1200- w
swan 1200- w
need help with a swan 1200 - w high drive box it has 4 6lq6 tubes which are new has no out put wattage i have checked it i didnt see anything burnt or looks bad any help would be appreacited
allways belive in jesus you will never go rong
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nomadradio
- Technical Helper
- Posts: 78
- Joined: Saturday 21st Aug 2004, 16:17
- Location: Louisville, KY USA
- Contact:
Well, I found the guy a manual.
http://bama.edebris.com:81/download/swa ... an1200.pdf
You might prefer to right-click on "Save Target As" with that link. A left click will launch Adobe reader as a browser plug in. A shaky proposition with some browsers....
Not a wise thing to stick your hands inside, unless you're familiar with routine precautions. And your life insurance is paid up to date. Your heirs will thank you.
But let's just assume you know the precautions.
You don't mention whether or not you hear an audible "click" from the relay? Until you do, the amplifier is in standby (receive) mode, as if were just a barrel connector in the coax line.
IF it has been modified, it could activate from your radio's transmitter RF, just like a CB linear.
BUT it's a ham linear, meant for you to activate with a patch cord from the amplifier's "relay control" socket to one on the radio.
It only gets worse from here. A simple foot switch will NOT key this amplifier. Swan saved a few cents by omitting any source of power for the relay, built into the linear.
If the keying circuit is original, you'll notice a fiber washer under the Relay socket on the rear of the 1200. This is because the center pin and outer contact are BOTH hot on this brand. Swan is the only outfit who did this. EVERYBODY else requires only a switch closure to ground to activate the relay in there and place it into transmit mode.
This dirty trick permitted Swan to put the linear's relay coil in parallel with the relay coil inside your Swan (only) radio. Yep, you'd have to modify your Swan ham linear to run it from any radio OTHER than a Swan radio.
As a result, the radio's relay circuit has both its hot and "key" sides connected to the relay socket.
And the relay in the amplifier has NO power to activate its coil without a Swan radio to key it.
Unless it's been modified.
If you can't even get a "click" from the relay using a foot switch, this may be what is going on.
The mod is simple. You put in a 12-Volt transformer, rectifier and filter capacitor to power the relay coil without a Swan brand radio on it.
73
http://bama.edebris.com:81/download/swa ... an1200.pdf
You might prefer to right-click on "Save Target As" with that link. A left click will launch Adobe reader as a browser plug in. A shaky proposition with some browsers....
Not a wise thing to stick your hands inside, unless you're familiar with routine precautions. And your life insurance is paid up to date. Your heirs will thank you.
But let's just assume you know the precautions.
You don't mention whether or not you hear an audible "click" from the relay? Until you do, the amplifier is in standby (receive) mode, as if were just a barrel connector in the coax line.
IF it has been modified, it could activate from your radio's transmitter RF, just like a CB linear.
BUT it's a ham linear, meant for you to activate with a patch cord from the amplifier's "relay control" socket to one on the radio.
It only gets worse from here. A simple foot switch will NOT key this amplifier. Swan saved a few cents by omitting any source of power for the relay, built into the linear.
If the keying circuit is original, you'll notice a fiber washer under the Relay socket on the rear of the 1200. This is because the center pin and outer contact are BOTH hot on this brand. Swan is the only outfit who did this. EVERYBODY else requires only a switch closure to ground to activate the relay in there and place it into transmit mode.
This dirty trick permitted Swan to put the linear's relay coil in parallel with the relay coil inside your Swan (only) radio. Yep, you'd have to modify your Swan ham linear to run it from any radio OTHER than a Swan radio.
As a result, the radio's relay circuit has both its hot and "key" sides connected to the relay socket.
And the relay in the amplifier has NO power to activate its coil without a Swan radio to key it.
Unless it's been modified.
If you can't even get a "click" from the relay using a foot switch, this may be what is going on.
The mod is simple. You put in a 12-Volt transformer, rectifier and filter capacitor to power the relay coil without a Swan brand radio on it.
73