• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • Click here to find out how to win free radios from Retevis!

Share your useful testing apps, I'll start

Eldorado828

8-2-8 in the Lonestar state
Feb 21, 2016
4,306
8,254
523
The Lonestar State
I know we all do some testing on our benches and not everybody has all the professional testing equipment. Either we're not on our well equipped bench or you need something on the fly so we at times have to improvise. With so much at our fingertips in this very technological age that wasn't at our disposal 15 to 20 years ago, I'm curious to see what some of you fellas have as quick smartphone or tablet tools. Share yours if you will. I'll start with one I've used a few times to put a test tone into a mic. 20200220_212241.jpg
 

Yeah a great subject. A quick and easy way to verify the audio amplifier circuit in a radio is to touch the center pin on the volume control, if you hear a hum or noise this verifies the audio circuit is working. Try not to touch any thing else in a tube radio as high voltages are in there. I use a screw driver that has black tape insulate the shaft exposing the tip.

Jay in the Grate Mojave Desert
 
Where I come from we call that the analog manual digital signal injector.

Poking it into the input of a radio's 455 kHz IF usually produces raucous noises. Used to have a AM radio station with a gospel format's transmitter a couple of miles away. Sure surprised a customer or two when I poked the output of the AM ceramic filter and a revival preacher came roaring out of the speaker.

Halleluia! The IF stage is working.

73
 
I have used the tone generator in a pinch. Normally I’ll use my Rigol on the bench.

The other thing I’ve used is CommTekk’s SINAD. Unfortunately, it’s not a “smartphone” or “tablet” tool or ap. But, it does a good job as a receiver alignment tool. On my main bench, I’ll use my old SINADDER 3 and HP RF generator. Both can cost some dough and the Hp is Yuge. The software is cheap and takes a computer you probably already have.
 

Attachments

  • IMG_5264.jpeg
    IMG_5264.jpeg
    53.5 KB · Views: 7

dxChat
Help Users
  • No one is chatting at the moment.
  • @ BJ radionut:
    HK6F ON 50.115 BEGGING!!!
  • @ Crawdad:
    I was too busy working them to see your chat posts! :giggle:
  • @ BJ radionut:
    those boys in Louisiana going to be hard to live with...working those HI stations...my buddy Greg KK5SW/4 elements @35ft/350 watts...2 HI contacts today!!!! Arnold KE5JXC snagged one also!!!
    +1