Hello my friend I probably saw you activate the park today but I didn't manage to catch you. Did you have that MX- P50M amp today? I purchased the Xiegu-X6100 and am struggling without an amplifier for now. Thanks for the great material Regards Mariusz SQ2ODE
Yes I do the same, 4cell lipo, As the output transistor is a 24/28V item, also is a 900 MHz so if you mod the filters you could use it on 6m, +, Good luck Dave 2E0DMB
I am using this cable: www.ebay.com/itm/175792120455. I did make my own, but it was very much a bodged together deal, so I ended up buying a proper cable.
Most likely the mrf 186 transistor is damaged. I had such an amplifier and it also gave out 30 watts. When I removed the transistor, it turned out that one arm did not work for it. You only need to change to the original. Now I have a micro PA50 50 W 3.5 MHz-28.5 MHz with a screen and with all protections and I am very pleased with it.
It will be *really hard* to damage the MRF186. It's rated 120W and can handle reflected power higher than this amplifier gives out. I guess very high temperature is what can kill this transistor in this amplifier. However, replacement transistor is quite affordable. And yes, this is a dual MOSFET transistor, so it can partially be damaged. And also when handling the transistor it's very sensitive for static discharges. Mine gives out 38 - 45W on all bands, with 5W input and 13.8V power.
@@LB0FI The MXP 50 is using a MRF designed for 28V that's why the output is generally poor esp. on SSB when run on 14 V. There's canadian ham who has been into it all. THe max drive level it should ever see is 7 W . Ten W is abusing it. At a 18-19V supply with 7W PEP Ssb it can produce about 35W out, Linear. more power will produce more OP but it won't be linear at all. 19V is what a lot of high quality Dell 4.5 Amp supplies can give you. The amp will give well over 35 W out if driven with 7W CW but obviously not linearly. It still needs increased Vcc to do that. The OP filtering on these amps is pretty much rubbish because of RF blow by on the relays (there is only one miniature RLY per cct) and likely no checks on the Ls as they are put in . The base Gp of the MRF is 9dB as per datasheet . The installed Gp is lower partly because of rubbish Ferrites used in the OPT. ZL1Mzr NzL
Hello my friend
I probably saw you activate the park today but I didn't manage to catch you.
Did you have that MX- P50M amp today?
I purchased the Xiegu-X6100 and am struggling without an amplifier for now.
Thanks for the great material
Regards
Mariusz SQ2ODE
Thanks for commenting! I was using the amp today, I usually use it when I have just a short time for an activation, as today.
How did you get it working with the x6100? I've tried it on mine and it reboots the radio when transmitting!
I bought a PTT-cable from eBay. It does need to be a 3.5mm TRRS cable and not a TRS though.
Power output depends from voltage. With 15V I'm getting little more. With 4 cells Lion battery even more. But prepare some additional cooling fan.
I will need to look into that.
Yes I do the same, 4cell lipo,
As the output transistor is a 24/28V item, also is a 900 MHz so if you mod the filters you could use it on 6m, +,
Good luck
Dave 2E0DMB
Hi, just wondered what cable you are using between your 6100 and the MX50. I have one of the amps and a 6100 and would like to hook them up.
I am using this cable: www.ebay.com/itm/175792120455. I did make my own, but it was very much a bodged together deal, so I ended up buying a proper cable.
Most likely the mrf 186 transistor is damaged. I had such an amplifier and it also gave out 30 watts. When I removed the transistor, it turned out that one arm did not work for it. You only need to change to the original. Now I have a micro PA50 50 W 3.5 MHz-28.5 MHz with a screen and with all protections and I am very pleased with it.
30 watts is actually within what I expected though.
It will be *really hard* to damage the MRF186. It's rated 120W and can handle reflected power higher than this amplifier gives out. I guess very high temperature is what can kill this transistor in this amplifier. However, replacement transistor is quite affordable. And yes, this is a dual MOSFET transistor, so it can partially be damaged. And also when handling the transistor it's very sensitive for static discharges. Mine gives out 38 - 45W on all bands, with 5W input and 13.8V power.
@@LB0FI The MXP 50 is using a MRF designed for 28V that's why the output is generally poor esp. on SSB when run on 14 V. There's canadian ham who has been into it all. THe max drive level it should ever see is 7 W .
Ten W is abusing it. At a 18-19V supply with 7W PEP Ssb it can produce about 35W out, Linear. more power will produce more OP but it won't be linear at all. 19V is what a lot of high quality Dell 4.5 Amp supplies can give you.
The amp will give well over 35 W out if driven with 7W CW but obviously not linearly. It still needs increased Vcc to do that. The OP filtering on these amps is pretty much rubbish because of RF blow by on the relays (there is only one miniature RLY per cct) and likely no checks on the Ls as they are put in . The base Gp of the MRF is 9dB as per datasheet . The installed Gp is lower partly because of rubbish Ferrites used in the OPT.
ZL1Mzr NzL