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Selecting power Fets for 500 KC transmitter
Greetings!!!
I plan on building a 500 KC transmitter, 200 watts output. I have never worked with power FETS before. What is the selection method used in determining which FET to use?? I see some great FETS cheap. Example: IRFP254 250 volt Vdss RDS on .14 Amps 32 amps Rise time : 51 NS Cost; 2.50 each The data sheet does not spec any freq's ( Ft) like bipolar transistors?? How do I select the right FET??? freq range Thanks!!! The 500 KC transmitter will run at 28 VDC |
Selecting power Fets for 500 KC transmitter
I can hardly imagine just about any device like this having an Ft so low
that it wouldn't work at 500 KHz. What ham band do we have at 500 KHz? wrote: Greetings!!! I plan on building a 500 KC transmitter, 200 watts output. I have never worked with power FETS before. What is the selection method used in determining which FET to use?? I see some great FETS cheap. Example: IRFP254 250 volt Vdss RDS on .14 Amps 32 amps Rise time : 51 NS Cost; 2.50 each The data sheet does not spec any freq's ( Ft) like bipolar transistors?? How do I select the right FET??? freq range Thanks!!! The 500 KC transmitter will run at 28 VDC -- Scott http://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version) |
Selecting power Fets for 500 KC transmitter
-- Scotthttp://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version)- Hide quoted text - - Show quoted text - There are Part 5 licenses recently issued for a 2 year duration 505 to 515 KC to WD2XSH for 20 watts ERP... I doubt that even 200 watts will get you there with any normal ham antenna... denny / k8do RV7 - even super SLOWER build.... |
Selecting power Fets for 500 KC transmitter
Scott wrote:
I can hardly imagine just about any device like this having an Ft so low that it wouldn't work at 500 KHz. What ham band do we have at 500 KHz? wrote: Greetings!!! I plan on building a 500 KC transmitter, 200 watts output. I have never worked with power FETS before. What is the selection method used in determining which FET to use?? I see some great FETS cheap. Example: IRFP254 250 volt Vdss RDS on .14 Amps 32 amps Rise time : 51 NS Cost; 2.50 each The data sheet does not spec any freq's ( Ft) like bipolar transistors?? How do I select the right FET??? freq range Thanks!!! The 500 KC transmitter will run at 28 VDC Well a friend of mine once wanted to build a mobile transmitter for 455khz AM and 10.7mhz FM so he could tell the bozo in the car ahead of him where to go after he cut him off..... |
Selecting power Fets for 500 KC transmitter
"ken scharf" wrote in message . .. Well a friend of mine once wanted to build a mobile transmitter for 455khz AM and 10.7mhz FM so he could tell the bozo in the car ahead of him where to go after he cut him off..... I hope you clued him in.. (re. 262 kHz...) Pete |
Selecting power Fets for 500 KC transmitter
It is a temporary authorization to specific hams or is it for something
completely different and it just happens to be a ham who asked the original question?? Scott N0EDV Denny wrote: -- Scotthttp://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version)- Hide quoted text - - Show quoted text - There are Part 5 licenses recently issued for a 2 year duration 505 to 515 KC to WD2XSH for 20 watts ERP... I doubt that even 200 watts will get you there with any normal ham antenna... denny / k8do RV7 - even super SLOWER build.... -- Scott http://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version) |
Selecting power Fets for 500 KC transmitter
LOL!! That might be more fun then using "the finger"
Scott ken scharf wrote: Scott wrote: I can hardly imagine just about any device like this having an Ft so low that it wouldn't work at 500 KHz. What ham band do we have at 500 KHz? wrote: Greetings!!! I plan on building a 500 KC transmitter, 200 watts output. I have never worked with power FETS before. What is the selection method used in determining which FET to use?? I see some great FETS cheap. Example: IRFP254 250 volt Vdss RDS on .14 Amps 32 amps Rise time : 51 NS Cost; 2.50 each The data sheet does not spec any freq's ( Ft) like bipolar transistors?? How do I select the right FET??? freq range Thanks!!! The 500 KC transmitter will run at 28 VDC Well a friend of mine once wanted to build a mobile transmitter for 455khz AM and 10.7mhz FM so he could tell the bozo in the car ahead of him where to go after he cut him off..... -- Scott http://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version) |
Selecting power Fets for 500 KC transmitter
ken scharf wrote:
Well a friend of mine once wanted to build a mobile transmitter for 455khz AM and 10.7mhz FM so he could tell the bozo in the car ahead of him where to go after he cut him off..... "This is God. You don't even want to know what I'm going to do to you for cutting that poor beloved gentleman off. Just don't make any long-term plans." -- Dec. 6 (Bloomberg) -- Government officials and activists flying to Bali, Indonesia, for the United Nations meeting on climate change will cause as much pollution as 20,000 cars in a year. |
Selecting power Fets for 500 KC transmitter
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Selecting power Fets for 500 KC transmitter
On Dec 28, 7:03*pm, Scott wrote:
It is a temporary authorization to specific hams or is it for something completely different and it just happens to be a ham who asked the original question?? Scott N0EDV Denny wrote: -- Scotthttp://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version)- Hide quoted text - - Show quoted text - There are Part 5 licenses recently issued for a 2 year duration 505 to 515 KC to WD2XSH for 20 watts ERP... I doubt that even 200 watts will get you there with any normal ham antenna... denny / k8do RV7 - even super SLOWER build.... -- Scotthttp://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version)- Hide quoted text - - Show quoted text - It's temporary (for now) and there are 23 licensees authorized... DO a search on the 500 kc and the call and you should come up with it... denny |
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