Help on MX-P50M connection

[Muhsin Dogrular]

I recently bought an  MX-P50M 45w power amp from aliexpress
I need help to connect PTT or ACC to trigger the amp on transmit.
I can solder and drill :)
thanks
Muhsin

next project is to connect an Radioberry to QRP Labs 10W linear amp

[Muhsin Dogrular]

EXTTR ?

[Steve Haynal]

Hi Muhsin,

Yes, you should use EXTTR. The ring is a common ground. The center pin is pulled low by the HL2 during TX. The control signal which the HL2 pulls to ground can be as high as 28V. See the schematic for more details.

Since this PA is meant to interface to a Yaseu, you might want to check out the band voltages here:

https://github.com/softerhardware/Hermes-Lite2/wiki/Band-Volts

How good is the filtering in this amplifier?

73,

Steve

kf7o

[Muhsin Dogrular]

Thanks Steve
MX-P50M  band change is manual
This weekend I will connect and try;
Then I will try to check the harmonics with TinySA
and I will let you know
73 de Muhsin TA1MHS

[Terry Genes]

Musin

Did you get it working and was it just a straight connection for PTT to EXTTR?

73 Terry G4POP

[Charlie Morrison]

Hi Terry

I've ordered a DIY Kits amplifier from Aliexpress to interface the HL2 to the Expert 1.3...It has no band pass filtering, but as its just going to be used as a pre driver i dont think I'll need it as the 1.3 will take care of that.

I believe Reid is working on a solution to interface it directly to the HL2 without the need for the I/O board. DIY Kits amp is £20 with all the taxes paid :-)

73, Charlie GI4FUE

[Terry Genes]

Sounds good Charlie, now have my small amp working fine so output uo to 50 watts. Getting really good and unsolicited audio reports using the Yeti PCmic