Re: [Elecraft_K3] K3S 630 Meter Quandry


Mel Farrer <farrerfolks@...>
 

Should have added it is spec'd down to 500 KHz.  Should be fine at 630 meters.

Mel, K6KBE



From: "Mel Farrer farrerfolks@... [Elecraft_K3]"
To: Elecraft_K3@...
Sent: Friday, December 29, 2017 8:14 AM
Subject: Re: [Elecraft_K3] K3S 630 Meter Quandry

 
See if you can find any of the older Motorola wideband amplifier bricks in the CA2812 series.  They had 30 db gain and 0.3 watt linear output, 12 VDC.  

Mel, K6KBE



From: "mfroster@... [Elecraft_K3]"
To: Elecraft_K3@...
Sent: Friday, December 29, 2017 7:12 AM
Subject: [Elecraft_K3] K3S 630 Meter Quandry

 
One of the reasons that I purchased the K3S was because it is capable of working the new 630 meter band.  The power output is something less than 1 mw.

I kept thinking that there should be a commercial amplifier available sometime, to take this 1 mw signal and amplify it to a usable output.

However, what I'm beginning to realize is that with the FCC limitation of 13 db amplifier gain limit, it will never be available.  It would take at LEAST 44 db of gain to get to 25 watts!

I realize there is the article:
but this design is non-linear.

I know there are some LDMOS devices that have gains in the order of 26 db (BLF188XR for one) and I'm wondering if there are any similar devices, somewhat lower power, that would take the K3S output to a 
respectable RF output in more of a linear fashion.

Mike,  W0IH
 




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