Recent content by MKwrench

If the outer ring of the jack is grounded, the speaker will always be working.

Does it still make decent power while talking in SSB? If not, something gave up the ghost. In post 5 you mentioned weird behavior while setting bias, I wonder if one of the the bias pots are screwed up. If bias is always high it can cook the AM regulator and possibly the final or driver from...

I wonder if the external jack is shorted to the case or something, pull the wire that goes to pin 3 on the mic jack and see what changes. Without it the ground side of the speaker and ext jack should be open nothing should be heard at all. If you still have sound or talkback follow the trace...

I grabbed a set of the Alervites AT1s (supposedly lifetime use) for use between our home and my elderly inlaws home. Pop cannot operate a cell phone, and if there is an issue where Mom cannot call us or 911, Pop should still be able to reach us. The PTT is a little hard for him to push, so I'm...

I had an old jumper of RG400 that I was able to get 11 windings on a single FT240 ring W1JR style (5-X-5), just for testing (its too stubby to use) and took a few measurements. Holy Schmoley what a difference.... I'ts not installed yet,this was just for tests. I'll double the rings as suggested...

Sometimes it's the mic. or related jack board. If it does not unground the RX pin, you'll get a talkback effect. Take a peek let us know what you find.

Sounds like a plan, I rewrapped my dual balun with single teflon insulated wire and the measurments weren't that great. I'll grab some RG400 and reuse two of my 43s. I dont have any 61 cores handy. I did get it to act up into the test load too and I can achieve the same output carrier on low...

Popped the amp back open to inspect, AI is telling me that a dirty switch or cracked solder joint near the input transformer can be an issue. I found the other thread I was looking for, It was by Shadetree where C8 was replaced by a variable cap to tune the input. The schematic I have from...

Good bump, I was just looking for this exact thread. Mine isn't the HDV version, but I'm sure this will help.

Now after swapping jumpers and meters around a few times chasing the issue at the other bands, I discover that the jumper between the radio and the amp make a huge change an RG58 3' gives me a wide range without the issue, a 8X 1' gives a little less and a LMR240 3' is terrible with a real thin...

On another note: Something I just read says that my parallel wound choke cuts the common mode resistance in half, I thought it was the other way around, while increasing the power handling. Then asking AI, suggests "twisting" a singular bifilar pair for maximum common mode choking and a better...

Okay I think We got it, My feed line is two sections of LSR240 (supposedly equivlent to LMR240), One 50' run from my attic feedpoint balun down to the basement, and anorher 20' or so from that point to the transceivers. Its where I had them connected that caused my problems. I didn't have a...

I just tried it on another antenna, which is just a magnet mount mobile stuck to my AC unit outside...lol And it works perfectly fine.

The antenna has one at the feed point already, I just added that other one to see if it changed anything. I agree that it's going to be the antenna causing the issue, I'm finding out that the further I go into the 10m band from 11m the better that carrier behaves. The feed point balun is a mix...

I'm glad you responded, I'm a little more confident about getting in there and checking things out. I'll start with the feedback sets as recommended. I'm really not familiar with the insides of these yet.