| Home |
| Search |
| Today's Posts |
|
#61
March 20th 06, 04:37 PM
posted to rec.radio.shortwave
|
|||
|
|||
BBC Programs Heard on DC-area FM stations.
m II wrote:
I was under the impression that most commercial transmitters used tubes. I don't think a couple of 2n2222 transistors could handle a 50 KW output. Nobody makes a 50kw transistor, but 200 250-watt transistors in push-pull-parallel will do the trick. Solid-state 50kw transmitters are by no means unusual. They're also a lot more reliable than tube rigs. We have a solid-state 6kw digital TV transmitter at work. It's amusing to pull out two or three power amp modules and see *absolutely nothing* happen -- the power meter doesn't even drop -- all that happens is you get an alarm on the control panel warning of the missing modules... -- Doug Smith W9WI Pleasant View (Nashville), TN EM66 http://www.w9wi.com |
|
#62
March 21st 06, 02:31 AM
posted to rec.radio.shortwave
|
|||
|
|||
|
BBC Programs Heard on DC-area FM stations.
Doug Smith W9WI wrote:
m II wrote: I was under the impression that most commercial transmitters used tubes. I don't think a couple of 2n2222 transistors could handle a 50 KW output. Nobody makes a 50kw transistor, but 200 250-watt transistors in push-pull-parallel will do the trick. Solid-state 50kw transmitters are by no means unusual. They're also a lot more reliable than tube rigs. We have a solid-state 6kw digital TV transmitter at work. It's amusing to pull out two or three power amp modules and see *absolutely nothing* happen -- the power meter doesn't even drop -- all that happens is you get an alarm on the control panel warning of the missing modules... Neat. It's like a redundant array setup for hard drives. mike |
|
#63
March 21st 06, 03:12 AM
posted to rec.radio.shortwave
|
|||
|
|||
|
BBC Programs Heard on DC-area FM stations.
On Tue, 21 Mar 2006 02:31:24 GMT, m II wrote:
Doug Smith W9WI wrote: m II wrote: I was under the impression that most commercial transmitters used tubes. I don't think a couple of 2n2222 transistors could handle a 50 KW output. Nobody makes a 50kw transistor, but 200 250-watt transistors in push-pull-parallel will do the trick. Solid-state 50kw transmitters are by no means unusual. They're also a lot more reliable than tube rigs. We have a solid-state 6kw digital TV transmitter at work. It's amusing to pull out two or three power amp modules and see *absolutely nothing* happen -- the power meter doesn't even drop -- all that happens is you get an alarm on the control panel warning of the missing modules... Neat. It's like a redundant array setup for hard drives. mike Sort of. The distortion goes up and the remaining devices are put under extra strain. |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| (OT) Gas and Diesel | Shortwave | |||
| "Spirit of pirate radio survives despite station's shutdown! | Broadcasting | |||
| Attacks on Haitian radio stations | Shortwave | |||
| Broadcast Station Field Strengths.. | Antenna | |||
| Who has the most RDS enabled stations in their area? | Broadcasting | |||
Linear Mode
