need help with a project.

[n0zna]

I have a old State Patrol RCA transiver...it is for 42 mhz.And has the red and black wires in back,pos and neg...But dont know about the white wire on the control head.nothing on internet about it...The modile # is ct1003 or HBA19BA11 thankyou de n0zna/John 73s email is n0zna@juno.com

 

[BJ radionut]

John/Your Project

John: I am just taking a shot here....but on some OLD military gear the white wire on the control head can be the switch leg(Positive/+DC) that returns the voltage back to the main unit from the control head.
You might try hooking up the red/black....turn on the on/off switch and see if this wire goes positive(+dc)...
GL 73
All the Best
BJ

 

[n0zna]

Thankyou will try this weekend...dont want to pop it...its in to good of shape...73s de n0zna/John

 

[N0NB]

I have no firsthand knowledge of that radio, but it seems consistent with an ignition sense lead so that when the vehicle ignition key is turned to the "on" position A+ is put on that wire so the radio turns on. OTOH, police radios, which I have no experience with firsthand (just looking at the options in the manuals), have various connections to give an officer communications even in the most unexpected of situations.

Might be worth tracing it out.

 

[n0zna]

Thanks alot everyone,73s de n0zna/John

 

[C W Morse]

I have no firsthand knowledge of that radio, but it seems consistent with an ignition sense lead so that when the vehicle ignition key is turned to the "on" position A+ is put on that wire so the radio turns on. OTOH, police radios, which I have no experience with firsthand (just looking at the options in the manuals), have various connections to give an officer communications even in the most unexpected of situations.

Might be worth tracing it out.

I wouldn't swear to it, but that is what I was thinking: either a direct ignition switch lead to prevent leaving the filaments on (if tube type) when the vehicle was parked, OR a lead that went to a separate relay box. The old Motorolas has such a wire, if I recall. It's been a LOOOOONG time since I installed one of those old boat anchors!!!

CWM