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Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Posted: Wed Jul 31, 2019 7:02 am
by G4WIM
Here's what the remote currently does

Monitoring

1. PA Vdd and over voltage limit
2. PA Idd and over current limit (high side monitoring through 0.01 ohm sense)
3. PA Temp and over temp limit
4. Provides temp compensated bias voltage
5. 500mS update rate - could be faster or slower or adaptive depending on mode of operation.

Control

1. Send command over RF link to turn on PSU into standby mode
2. Send command over RF link to turn on PA bias (effectively the PA) and activate cooling fans
3. Send commmand to turn off PA but leave fans running for 4 minutes
4. Send 12V up coax for standby mode
5. Send 24V up coax for tx mode

Notes,

1. Controls 1 - 3 over ride 4 & 5.
2. Anything over limit shuts the PA down
3. If the remote RF signal goes away for more than 4 seconds the PA shuts down but reverts to DC up the coax control
4. PA status (Vdd, Idd, Vbb, Temp, fans) are all reported remotely.
5. Each end of link uses Atmel ATmega328 as main controller plus Atmel Nano and nRF905 for the RF link plus a 4 line 20 character LCD.
6. All code is written in C so fairly easy to customize.
7. RF link freq can be 433 or 868MHz but the nRF905 modules come pre tuned for 433MHz.
8. Range is well over 100M with modest whip antenna.
9. PA will only operate if all the paramters are within limits.
10. RF link speed is 2400 baud.

If there's enough interest and someone is willing to design / produce a PCB I'll release the design and code into the wild.
I have the means to design the PCB here - but have too many other projects on the go to take care of it in the near future plus I'm having trouble with my eye sight.

Regards Tim

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Posted: Wed Jul 31, 2019 9:26 pm
by G4WIM
Here's a picture of my PA controller.

If a PCB were to be created the same board could be used at both ends but populated as required.

It matches the Minitiouner Pro.

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Posted: Wed Aug 07, 2019 3:18 pm
by iz4ryb
M0SKM wrote:
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
Hi,
I've purchased ampleon 250w module and mounted in a Siemens case. It works fine, I'm
waiting a dish illuminator to proceed with Datv tests.
Got some trouble with internal bias compensation.
See attached picture.
Bye!

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Posted: Mon Nov 18, 2019 9:16 pm
by dk1za
This is really a good idea. On one hand to operate the power amplifier remotely and to monitor its function, temperature ... (!).
On the other hand to use the same blue housing as for the minitiouner. An optimal team!
Half of it I am using thus far.
Although I have hardly any special experience with the design for a pcb. Nevertheless, I would like to see the schematics and the code. (Programming is not a problem)
Once again thanks for sharing your idea.

Walter

Re: 250W Linear PA using Ampleon BLC2425M9LS250 mosfet

Posted: Sat Aug 01, 2020 2:29 pm
by Patrick
hello.
I would like to know whether there are any printed circuits necessary to build an ampli with BLC2427 M9LS250.
If so, or can we lend it to ourselves and at what cost.
in advance, thank you
73’s
Patrick