Recently received a bag of crystals for Hitec. 3--- blue tagged 72.310rf ch26
1--- blue tagged 72.410rf ch 31 1---lite purple 72.410rf ch 31. How do I tell if these are receiver or transmitter crystals? Thanks in advance. Jon Earley

Adjacent to the frequency number a you'll see alpha characters, R=Rx T=Tx, RA=RX single conversion 72mHz, RF=RX dual conversion 72mHz, RS=Rx single conversion 75mHz, TF=Tx FM and TA=Tx AM.

So I gather these are all receiver dual conversion crystals. Thank you very much.