MRF300 Chinese linear kit !!
- Bton-FM
- tower block dreamin
- Posts: 463
- Joined: Sun Jun 16, 2019 2:55 pm
- Location: Beside the seaside
MRF300 Chinese linear kit !!
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!!
- Electronically
- tower block dreamin
- Posts: 431
- Joined: Wed May 13, 2015 11:43 am
Re: RE: MRF300 Chinese linear kit !!
run it at 250 Watts will be allright no chance would I pump that too 500 WattsBton-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!!
Sent from my AMN-LX9 using Tapatalk
- Bton-FM
- tower block dreamin
- Posts: 463
- Joined: Sun Jun 16, 2019 2:55 pm
- Location: Beside the seaside
Re: MRF300 Chinese linear kit !!
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 .
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 .
- rigmo
- tower block dreamin
- Posts: 461
- Joined: Wed Jan 30, 2019 9:35 pm
Re: MRF300 Chinese linear kit !!
single mrf300
You do not have the required permissions to view the files attached to this post.
- Electronically
- tower block dreamin
- Posts: 431
- Joined: Wed May 13, 2015 11:43 am
Re: RE: Re: MRF300 Chinese linear kit !!
Now that looks a hell of alot better.rigmo wrote:single mrf300
Sent from my AMN-LX9 using Tapatalk
- Bton-FM
- tower block dreamin
- Posts: 463
- Joined: Sun Jun 16, 2019 2:55 pm
- Location: Beside the seaside
- rigmo
- tower block dreamin
- Posts: 461
- Joined: Wed Jan 30, 2019 9:35 pm
Re: MRF300 Chinese linear kit !!
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!!!