[Motorola] FHTRU The First Walkie Telephone

[Paul Signorelli]

Did you ever use an FHTRU/H23 as a Common Carrier Telephone?
This was my first Telephone.
i had mine on the 'YJ' Telephone channel.
The radio conversion was easy for  full duplex operation.
All i did was to jumper the receiver filaments to stay on all the time.
This made an analog full duplex telephone.
Having a telephone that was full duplex gave it a 10X range over a non-duplex telephone.
A quarter watt can go a long ways when you can hear the base station repeater output.
Instead of asking the Mobile Operator, 'Can you hear me now?',  all i had to do was to listen for my own signal and find a 'full quieting' hot spot.
Current CDMA digital cell phones do not have full duplex operation and don't even have any sidetone.
Dropping a few bytes doesn't really matter to the overall quality these days.Yes, it was licensed as KG6685 in 1963.i also tried to make this modification to my P31, 5W, Walkie Talkie but there was too much receiver desensitization for it to work well.Paul   w0rw