**** NOTE: I changed the 33 ohm resistor to a 22 ohm to get it closer to actual swr, make sure and check your amp.
@temporarilyoffline11 ай бұрын
Nice fix - didn't look too difficult and it worked!
@loraz011 ай бұрын
I have added an antuner AT-100M downstream of the amp. I can run short random wires in the field with the amp and a uSDX+ V2. I end up with 30w peak SSB and I am good with that. It all fits in a condor molle first aid kit. A 6ah battery keeps the amp happy for a long while. Radio and tuner have built in batteries.
@robertvantichelt644811 ай бұрын
The designer of the amp commented on another forum that the meter is accurate and to try RF chokes on the antenna before modifying it. RF feedback can make the meter report higher than actual swr
@russbrown19411 ай бұрын
I did exactly that and my problems went away. Put a bunch of ferrites on the input and on the coax to the radio. Works great with my Xeigu 6100
@KK6USYHamRadioAdventures11 ай бұрын
Yes I saw that and I do have a choke in line. I will do more testing though.
@Swamp-Fox11 ай бұрын
Nice! Glad it was a quick & easy fix for you.
@louisreeves70911 ай бұрын
Great and useful video Chuck
@don_n5skt11 ай бұрын
I have not had any of those issues. Good fix Chuck. BTW, I have hit 72W on the amp before the protection kicked in.
@TheSmokinApe11 ай бұрын
Solid work Chuck 👍
@KK6USYHamRadioAdventures11 ай бұрын
Thanks Ape it really seems to be a good little amp!
@loraz011 ай бұрын
@@KK6USYHamRadioAdventures David Trewren has a video showing the amp with a tuner on an X6100. I have the same set up and use it with both the Xiegu and a uSDX radio. I like it.
@pawol62013 ай бұрын
you should recalibrate SWR bridge by serial console as described in the manual instead of "sculpturing"
@JeffreyByrns2 ай бұрын
I am not sure this is really needed. I have this amp and it works great. If you put a common mode choke on it, I think you will get better results. In any case... there is a firmware update that address the SWR measurement. I updated the firmware and use a common mode choke and do not have any issues.
@Weightlossjourney246 ай бұрын
I bought a pa50 for my X6100 wanted a little more power for my CW POTA
@mikewillis159211 ай бұрын
I would check that VSWR across all frequencies and values to see if it really is consistent. I have not seen the schematic so it isn't clear where that resistor is going, but usually these types of detectors are quite accurate at HF and it is important that that resistor is 50 ohms. Putting a 22 across it pretty severe. I would also check the power indication, but that's the other resistor. Why not use an SMD resistor to reduce the gain across the bridge output? It would make a neater job.
@KK6USYHamRadioAdventures11 ай бұрын
This is what I had and I'm fine with it. I did check other freq. also and it seemed consistent.
@mikewillis159211 ай бұрын
@@KK6USYHamRadioAdventures Fair enough. As long as it works. That resistor might get a bit hot though in full carrier modes like FT8 as it looked like an 1/8 watt and the original looks like a 1/2 w. An easier fix is to put another 10k across the detector output, you would need an SMD and they are fairly small so would need a magnifier. I tried to link the reference but youtube deleted it. - it is on the sota web page, easy to find, with a nice picture.
@KK6USYHamRadioAdventures11 ай бұрын
@@mikewillis1592 The original is 1/4 and so is the one I added
@faustdownunder7 ай бұрын
We installed this amp inside a big /p radio box. The IC705 does not provide enough drive for the 300W linear amp. Unfortunately, the PA50 did not work. Input VSWR was very high. Not sure why. Found a "manual" online but got no clue. My feeling is that a PTT line is needed. Manual says, it can run without a PTT but no idea how to set that up. Any help is most appreciated. 73
@sixteenmusic34911 ай бұрын
You may have covered this before, is it true that the input power can be internally adjusted on the PCB to 10W using the potentiometer?
@sixteenmusic34911 ай бұрын
I looked it up; it’s adjustable using the onboard potentiometer. Kinda cool feature
@joen8joe23110 ай бұрын
My understanding is that there is a firmware update to correct this. Ape did a recent video on it. This fix looks easier though 😂
@KK6USYHamRadioAdventures10 ай бұрын
Yes but he didn't check to see if it fixed the problem mines works great now!
@joen8joe23110 ай бұрын
The firmware upgrade looks like a pain in the butt…this definitely looks easier. I don’t own one of these units yet. If the firmware addresses the issue I’ll buy an upgraded version if and when available. Nice addition to my KX2 I suspect
@KK6USYHamRadioAdventures10 ай бұрын
@@joen8joe231 Yea I have been using mine with the Hermes lite 2 and it does 50 watts with no problem and my swr reading is pretty close now. The fan is a bit noise sitting in the shack
@SV1RXI8 ай бұрын
@@KK6USYHamRadioAdventures can you try with the slider of hermes to -7.5db ,drive closed i mean and tell me what the output is? i want it also for portable abut also to trigger another amp that needs 10 to 13w max (rm italy 300v plus ) Thanks
@KK6USYHamRadioAdventures8 ай бұрын
@@SV1RXI I will try it and get back to you. I have used to do that to my AL80B and at 50 watts get 500 out. Not sure it will be low enough to stay below 13w.
@ibuildsheds56546 ай бұрын
Manufacturer warns against this mod… there is a firmware update Icom is due to announce the new IC-PA705 in March 2024 for April release
@DonzLockz11 ай бұрын
A nice easy fix for those who can see well.😊🥸 Ate they generally okay other than that Chuck?