EF Johnson Ranger Ham Radio Transmitter Hum in Audio Repair test Part 2
Вставка
- Опубліковано 7 вер 2024
- Challenge accepted! The modified relay switching has been removed, which eliminated the hum in audio from stray AC. Now the Ranger has 1 relay system for push to talk. Tested, monitoring on a National NC-300, all's well. This was a time consuming task, however more parts were pulled out than installed. I believe the Ranger is ready for service again. Remember Murphy's laws guys, If it's not broken, don't fix it. Here is the perfect example.
Terry i think the only thumb down in this video maybe belong to the person who damage this beauty.
nice video
Nice job Terry, pulling this nice example from a certain trip to the dump.
Sounds like the person doing the mods was trying to reduce switch arcing by using relays and let the various switches live longer. The simple way to get switches to last is to NOT flip/turn them key down and clean them with a good contact cleaner every 3-5 years.
I agree with your assessment of Johnson Engineers. They really did a great job on most all of their products.
73,
Glenn WA4AOS
extremely valuable videos...im currently troubleshooting my ranger and this is like moral support for the nights when ive done my limit of thinking about the problems.
That radio sounded beautiful when you were done with it.
Happy Father's Day Terry.
Just watched the video and thought, maybe that's why I got a hum on my Valiant. Been chasing it for a year and ran downstairs and put the case on it....yeah, it got worse bahaha. Funny thing is, if I run outboard audio to (I think) the 2nd audio stage, there's no hum. It's around the 1st stage (12ax7 i think) and i changed all components and it's still there. Oh well, I'll just run the condenser microphone and not worry about it lol. Happy Father's Day Terry and thanks for another great video!
What's with the pulsating red lights on the ranger?
Great advice Terry on keeping things original. I agree with you and great fix !!
Where is the cobbler....
He is in Part 1
I wonder if he powered the 12 volt relays by connecting the missing 5 volt rectifier filament line in series with the 6.3 volt other tube filament winding. Connected together, it would resulted in 11.3V, which may have been enough to activate and switch a 12 volt relay. If the line voltage was a little high, as it is, this could have easily produced 12 volts.
That mod looks like it was done by a cber
Great unmod video. Must weight a pound less without the Kobbler parts. The Ranger must be a very happy radio transmitter now Terry!
Looks like the Kobbler was watching and gave you a thumbs down as he grits his kernel teeth!
another win for DLab ! One question though: the hum heard on the receiver at the end, is that from ground loops ? if you were to use a battery powered receiver that hum wouldn’t be there, right ? ok, that was 2 questions :-)
Yes, you can hear that level change when I tuned the NC-300 dial
Actually, you are more sane than most. I've see a certain person on U-Tube just cut into wiring.
Point well taken. Thanks for the look.
There's nothing like a D-104 Lollypop!
I'm lucky my ranger 2 is all stock but old. Even has stock Johnson tubes. Well have to see how she is in a few weeks.
hello, I saw you using a piece of test equipment in a different video its your stereo output tester. just wondering where you got that from or did u build it?
Hi Don, I built that unit
@@d-labelectronics awesome..... do you have any info on what's in it?
I would love to have something like that
It's a hummer
I've been following your guitar amp videos and didn't realize you also have a ham shack. Now it makes since why you peruse the ham radio swap meets. Does anyone use a keyer anymore or was that just for test requirements? I remember how intimidating 5 words per minute seems back in the day. Really enjoy your videos, thanks.
It's really sad because in general the less experienced or new amp or radio buyers are not aware how cobbled up their new purchases can be, which in turn means a higher price at the repair bench.l
That was a real hack job on the radio you fixed. Good job. I hate working on undocumented modifications.
Terry I live in Monroeville pa just east of Pittsburgh I have a heathkit Mohawk and a apache look to be unmolested and complete would you be interested in fixing? I'd have to deliver must to heavy and fragile to ship
yes you are right about that going in and update a radio like thatcan be bad and you can die from it and one this to you terry from me to you and all the dads out there happy father's day and rock this house to from gerald from downtown bc mi