Thanks for that post, Mark. Looks like we are about to be inundated
with anew generation of SS amplifiers. It's a good time to be a ham!
73, Bill W6WRT
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Fri, 21 Apr 2017 09:37:35 +0100, you wrote:
>Just when SPE decided to upgrade their 1k3 amp. to use a 1k5 transistor:
>
>http://www.richardsonrfpd.com/Pages/Product-Details.aspx?productId=1241241
>
>So, 65 Volt looks to be the new 50 Volt, but surely the problem of getting
>the heat away from the junction is getting worse. Personally, I wish the
>amplifier manufacturers' would adopt a more modular approach - run the FET
>around the 800 Watt level, where there's a fighting chance of easy matching,
>keeping them cool and getting reasonable linearity, and conceive a system to
>allow users' the ability to buy and combine as many power modules as they
>require. I believe Flex has gone some way toward this approach, in that they
>are using two devices in their new SS amp., to ease some of the design
>challenges.
>
>
>Good to see that Elecraft is looking to release a 1k5 model. I could not
>find any info. about the new Elecraft in the FCC database, but the link
>below is a good one for the curious:
>
>https://fccid.io/frequency-explorer.php?lower=1.8&upper=54&exact
>
>
>I think we are truly seeing the sun setting on valve HF PA and analogue
>front-end transceivers. The combination of big LDMOS FET and majority DSP
>TRx, with whole-chain linearity correction, is delivering some of the
>cleanest SSB signals ever heard on the amateur bands. It's still fun to play
>with those examples from the last 50 years of our history though!
>
>Regards,
>
>Mark.
>
>*******************************************************
>Mark Hill - G4FPH
>E-mail: g4fph@mjha.co.uk
>Website: www.g4fph.net
>WebSDR: www.160m.net
>*******************************************************
>Dipoles resonant on 1935 / 3720 / 5345 / 7125kHz
>*******************************************************
>Remember - SIDE for HV safety:
>S witch off
>I solate
>D ump
>E arth
>*******************************************************
>
>
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