Les Posted September 23, 2015 Report Share Posted September 23, 2015 Click to Enlarge 71.88 KB I took one apart and there are copper plates, springs, insulation plates (bakelite), etc. the box is a standard cigar box for scale. Link to comment Share on other sites More sharing options...
Marc Posted September 23, 2015 Report Share Posted September 23, 2015 My guess is that they're crystals. Each vibrates at the specific frequency that's marked on it. Frequency generators that are used to power transmitters (ham, public radio/tv, police, etc) normally drift around a little. The crystals hold them on target. Transmitters need to transmit at specific frequencies within extremely tight tolerances, otherwise receivers might miss it, neighboring spectrums become polluted with your trash and if the FCC catches it, they triangulates your location and come knocking on your door. Apparently, the guy who owned that box of tubes, etc worked on transmitters. Marc Link to comment Share on other sites More sharing options...
Nolan Kienitz Posted September 23, 2015 Report Share Posted September 23, 2015 Crystals for the frequency noted on the case. They were cut to oscillate/operate only at the specific frequency. Tunable VFOs were not available back in the day. There are some ham radio operators who build QRP (low power) rigs that are crystal based and when they post for a QSO (conversation) they say they are "rock bound" ... as they are using a crystal. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now