https://a.aliexpress.com/_dVJDb8c

I have just seen this on AliExpress! It looks like the mrf186 board just with 2 MRF300’s instead!

It says it’s for the 2m band but I think it could be reworked for 3m? I don’t think they have got the input or output matching right though because it does 500 watts with 5-6 watts of drive (supposedly). I think 2 MRF300’s should do 600W plus with 2-3 watts input. Maybe the designer is overdriving the input to achieve some broadband performance (plus some extra carriers).

I’ve seen a HAM radio dude do the matching with a 1:9 TLT using 17 ohm coax, perhaps that could be implemented here.

I’m not an expert by any stretch of the imagination so I’m just speculating. I just thought that I’d share it since it could be a really (REALLY) cheap way to do a 600 watt rig!!

Bton-FM wrote:
https://a.aliexpress.com/_dVJDb8c

I have just seen this on AliExpress! It looks like the mrf186 board just with 2 MRF300’s instead!

It says it’s for the 2m band but I think it could be reworked for 3m? I don’t think they have got the input or output matching right though because it does 500 watts with 5-6 watts of drive (supposedly). I think 2 MRF300’s should do 600W plus with 2-3 watts input. Maybe the designer is overdriving the input to achieve some broadband performance (plus some extra carriers).

I’ve seen a HAM radio dude do the matching with a 1:9 TLT using 17 ohm coax, perhaps that could be implemented here.

I’m not an expert by any stretch of the imagination so I’m just speculating. I just thought that I’d share it since it could be a really (REALLY) cheap way to do a 600 watt rig!!

run it at 250 Watts will be allright no chance would I pump that too 500 Watts

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https://eb104.ru/internet-magazin/vhf-p ... pper-plate

I have a feeling it’s a copy of this.

Also forget what I was saying about input drive that’s probably untrue that it should need only 2-3 watts .

single mrf300

rigmo wrote:single mrf300

Now that looks a hell of alot better.

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rigmo wrote: ↑Wed Aug 12, 2020 10:15 pmsingle mrf300

Is that your design?

Bton-FM wrote: ↑Wed Aug 12, 2020 10:23 pm

rigmo wrote: ↑Wed Aug 12, 2020 10:15 pmsingle mrf300

Is that your design?

Hi, is not mine..
I do not like this china twix board an bn mrf300 because is not good match...
The best twix mrf300 board is from PCS-ELECTRONICS. 600-650w
The best ever build single board is from Greek.. 1.25W drive to get after LPF 300!!!