From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:13 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40

Sorry...let's try this again. I hate working on a phone.

Dan - I live on a sail boat. A couple of meters of tinned braid tossed over the side, a shortened 40 meter vertical, and 8 Watts from my uBITX V6 is all I need for a reliable Winlink connection across the Gulf of Mexico to Brownsville, TX for email and wind data. I know for a fact that I don't "need" 20W or even your suggested 50 W to do what I need to get done.

No sir - everybody does not "need" 50 or more Watts.? You do you - enjoy your QRO gear!?

There is no "reason" to build our own gear? There is no "reason" for the Amateur service either, I guess. That's not going to stop me from building, or continuing to learn how to build amplifiers. That's precisely why I got this ticket, after all.

Best, Andy, KG5RKP/MM

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:

20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.

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However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?

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The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.

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I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE

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From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40

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Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua