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#1
January 3rd 07, 01:23 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
These transistors cost $69.95 at RF Parts
This is a fantastic deal... http://www.telstar-electronics.com/d...sClearance.htm |
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#2
January 3rd 07, 10:38 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
"Telstar Electronics" wrote in message ups.com... These transistors cost $69.95 at RF Parts This is a fantastic deal... You forget they do not work in a CB! That is a MOSFET so a number of changes would be required to the circuit. You also need to accommodate it which might be difficult as the rest of the board was designed around a TO220. The frequency range is too high so no chance of much gain on 27MHz. Go and do some research. |
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#3
January 3rd 07, 10:53 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
ray wrote:
You forget they do not work in a CB! That is a MOSFET so a number of changes would be required to the circuit. You also need to accommodate it which might be difficult as the rest of the board was designed around a TO220. The frequency range is too high so no chance of much gain on 27MHz. Go and do some research. Never said they worked directly in a CB. They certainly can work at 27MHz though.. with very good gain! They are also 28Vdc. I sure can tell you're an engineer. Thanks for your input... www.telstar-electronics.com |
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#4
January 4th 07, 11:14 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
On Wed, 3 Jan 2007 21:38:14 -0000, "ray" wrote:
+++ +++"Telstar Electronics" wrote in message egroups.com... +++ These transistors cost $69.95 at RF Parts +++ This is a fantastic deal... +++ +++You forget they do not work in a CB! That is a MOSFET so a number of +++changes would be required to the circuit. You also need to accommodate it +++which might be difficult as the rest of the board was designed around a +++TO220. +++The frequency range is too high so no chance of much gain on 27MHz. +++Go and do some research. +++ ************** Go and do some research. Gain increases as frequency decreases. The major problem of using this device at 27 MHz is keeping the gain low enough so that the amp will be stable. Any amp using this part at 27MHz will have to have a lot of feedback to minimize gain. Also FET large signal impedances are not all th at different from bipolar devices. With RF power amps you are more interested in the large signal characteristics of the device and not the small signal characteristics. This device would make a decent preamp for 27MHz if you can make it stable. Would have a excellent 3rd order intermod characteristics also. james |
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#5
January 5th 07, 07:16 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
james wrote:
Go and do some research. Gain increases as frequency decreases. The major problem of using this device at 27 MHz is keeping the gain low enough so that the amp will be stable. Any amp using this part at 27MHz will have to have a lot of feedback to minimize gain. Yes the gain would be high at 27MHz... however... having too much gain is never really a big problem... you can always throttle it back. It's having too little gain that comes to get you... LOL www.telstar-electronics.com |
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#6
January 6th 07, 03:31 AM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
On 5 Jan 2007 10:16:50 -0800, "Telstar Electronics"
wrote: +++james wrote: +++ Go and do some research. Gain increases as frequency decreases. The +++ major problem of using this device at 27 MHz is keeping the gain low +++ enough so that the amp will be stable. Any amp using this part at +++ 27MHz will have to have a lot of feedback to minimize gain. +++ +++Yes the gain would be high at 27MHz... however... having too much gain +++is never really a big problem... you can always throttle it back. It's +++having too little gain that comes to get you... LOL +++ +++www.telstar-electronics.com ********** right, keep on thinking man. Get a unity gain with the right feedback and you have an oscillator. james |
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#7
January 6th 07, 05:35 AM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
On Sat, 06 Jan 2007 02:31:08 GMT, james wrote
in : On 5 Jan 2007 10:16:50 -0800, "Telstar Electronics" wrote: +++james wrote: +++ Go and do some research. Gain increases as frequency decreases. The +++ major problem of using this device at 27 MHz is keeping the gain low +++ enough so that the amp will be stable. Any amp using this part at +++ 27MHz will have to have a lot of feedback to minimize gain. +++ +++Yes the gain would be high at 27MHz... however... having too much gain +++is never really a big problem... you can always throttle it back. It's +++having too little gain that comes to get you... LOL +++ +++www.telstar-electronics.com ********** right, keep on thinking man. Get a unity gain with the right feedback and you have an oscillator. Especially with a high input impedance and large internal capacitance. Try to run them puppies hard outside the recommended frequency range and -=POOF=-!!! |
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#8
January 6th 07, 03:23 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
Frank Gilliland wrote:
Especially with a high input impedance and large internal capacitance. Try to run them puppies hard outside the recommended frequency range and -=POOF=-!!! Nonsense Frank... I have built amplifiers at 40MHz with these MRF173s with no problem. That's like saying since a 2N3055 has an Ft=2.5MHz... that you couldn't use for an audio amp... or they would blow up... LOL www.telstar-electronics.com |
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#9
January 6th 07, 05:44 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
On 6 Jan 2007 06:23:18 -0800, "Telstar Electronics"
wrote in . com: Frank Gilliland wrote: Especially with a high input impedance and large internal capacitance. Try to run them puppies hard outside the recommended frequency range and -=POOF=-!!! Nonsense Frank... I have built amplifiers at 40MHz with these MRF173s with no problem. Uh-huh. That's why you are unloading them at a fraction of the market price, right? That's like saying since a 2N3055 has an Ft=2.5MHz... that you couldn't use for an audio amp... or they would blow up... LOL Incredible..... how do you manage to stick your foot so deep into your mouth? The 2N3055 is bipolar, has a relatively low input impedance, and is -INTENDED- for frequencies from DC through audio and up. Not only that, your implication is that the transition frequency (Ft) is the intended operation frequency when in fact it is the point at which the transistor exhibits unity gain, making it pracitically useless at that frequency. So where's that schematic, Brian? |
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#10
January 6th 07, 05:49 PM
posted to rec.radio.cb
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High Power RF Transistors for Sale...
Frank Gilliland wrote:
Incredible..... how do you manage to stick your foot so deep into your mouth? The 2N3055 is bipolar, has a relatively low input impedance, and is -INTENDED- for frequencies from DC through audio and up. Not only that, your implication is that the transition frequency (Ft) is the intended operation frequency when in fact it is the point at which the transistor exhibits unity gain, making it pracitically useless at that frequency. Frank, don't know any nice way of saying it... you're just plain stupid. www.telstar-electronics.com |
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