250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Latest News and Discussion about the use of the DATV transponder on Es'hail-2
g7ntg
Posts: 24
Joined: Sat Feb 17, 2018 7:07 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by g7ntg » Thu Jul 25, 2019 10:47 am

Is anybody interested in building my BLC2425M9LS250 250 watt amplifier? See https://wiki.batc.org.uk/Transmitting_O ... Amplifiers
I have my first quote for PCB’s and will be able to send them to EU for about £40 GBP including postage. If anybody would like one then email me to go on the list thebigclunk@virginmedia.com
I need to have orders for 20 to break even as I make no profit. I have 8 orders so far since yesterday

g7ntg
Posts: 24
Joined: Sat Feb 17, 2018 7:07 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by g7ntg » Thu Jul 25, 2019 11:05 am

the module is BPC2425M9X250Z available from Digikey

g7ntg
Posts: 24
Joined: Sat Feb 17, 2018 7:07 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by g7ntg » Thu Jul 25, 2019 7:15 pm

I forgot the VAT so PCB price mentioned above is £45.30 + postage - I have orders for 20 sets now so I will order on monday to allow me to up the order quantity if necessary

M0YDH
Posts: 155
Joined: Sat Dec 31, 2016 5:59 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by M0YDH » Sat Jul 27, 2019 11:33 am

Hello Jim
Am I in time to order a PCB please?
It looks a challenging build and worthy of a club workshop day in 2020.
73
David M0YDH

G4WIM
Posts: 257
Joined: Thu Jan 29, 2015 8:36 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by G4WIM » Mon Jul 29, 2019 6:19 am

Hi guys,

do you think an isolator is required or necessary for the output ?

Also please add my name to the list for a PCB.

Regards Tim

g0mjw
Posts: 888
Joined: Sat Sep 20, 2014 9:15 am

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by g0mjw » Mon Jul 29, 2019 6:25 am

G4WIM wrote:
Mon Jul 29, 2019 6:19 am
Hi guys,

do you think an isolator is required or necessary for the output ?

Also please add my name to the list for a PCB.

Regards Tim
Required probably not. Necessary probably yes.

G4WIM
Posts: 257
Joined: Thu Jan 29, 2015 8:36 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by G4WIM » Mon Jul 29, 2019 9:09 am

Hi Mike,

just had a bit of a set back - my MRF24300n has departed this world and I'm not entirely sure why.

I'm thinking it may have been a momentary over drive as it failed at power up - despite waiting for things to settle down before bringing the PA on line.

So back to square one for me !

Such is life !

For the MKII I think it's belts and braces in the shape of an isolator - despite the antenna being a resonable match or at least it was last time I checked.

Regards Tim

G4WIM
Posts: 257
Joined: Thu Jan 29, 2015 8:36 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by G4WIM » Mon Jul 29, 2019 11:11 am

Looks like there's quite a bit of interest in this solution, so I have a couple of questions.

1. I wonder what users plan to use as a driver between exciter (say a Lime) and the PA ? Maybe one of those '8 watt' wifi amps running at 1.5 to 2 watts output would suffice ?

2. If the amp is being remotely mounted would there be any interest in a remote control / telemetry add on similar to the one I use ?

If so maybe it could be worth making a proper PCB for it ?

Regards Tim

radiogareth
Posts: 314
Joined: Wed Jan 06, 2016 9:46 am

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by radiogareth » Tue Jul 30, 2019 8:31 am

I plan to remote mount so yes, I'd be interested. Its an interesting project anyway, remote monitoring of anything :-)
Gareth G4XAT

M0SKM
Posts: 253
Joined: Sun Jul 13, 2014 3:15 pm

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Post by M0SKM » Tue Jul 30, 2019 8:45 am

Yes Tim I like that idea; also a good article for CQ TV.
Currently I switch my PA with a 433MHz key fob device, a hasty solution.

Steve

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