Couple days ago I have bought a nice specimen of mid-1980 devices - the VHF automobile transceiver Bosch KF-166-6. Specifications say:
Mine TRX is a 6 watts version and can be turned on. I haven't tried it on the air because I decided to use its content for future development. Now I understand I had to try it out to understand that it is really working. Now I will have to apply more power in order some part really works when I decide to use somewhere else.
Below are some pictures of the transceiver.
The front panel and mic. The microphone socket has a lot of pins and can handle some additional signals whatever they are.
Rear view. As you can see the antenna connector is BNC. Not a lot of contemporary transceivers has such a type of antenna connector.
The top lid is removed. A lot of SMD elements are exposed.
The monolithic PA from Motorola. Four pins are the ground, +12V DC, In, Out. This one is able to emit 6 watts.
This seems to be a bandpass filter. I have to examine it using my VNA.
Bottom PCB handles the analog part of the TRX. Nice view.
Bottom lid is removed. Nothing interesting.
I extracted the BPF. Nice specimen of a good design. Will test it soon.
The Bosch motor vehicle radios KF 166 Chp operate in the 2m band of 146-174 MHz with a channel spacing of 12.5 kHz, 20 kHz and 25 kHz in Simplex or Semidupiex modes. The devices are intended for non-public land mobile broadcasting and are supplied in 2-channel version. It is possible to use a 5-tone sequence encoder-evaluator simple design without remote coding or a uP-controlled 5-tone sequence encoder-evaluator with up to 5 digit encoding.
Depending on the version, the transmit power is 6W, 12W or 25W (export only), the NF output power is about 4W to 4 ohms. The devices are for the connection designed for vehicles with 12 V and minus pole on the vehicle chassis. For other voltages, use a ballast regulator or converter.
Mine TRX is a 6 watts version and can be turned on. I haven't tried it on the air because I decided to use its content for future development. Now I understand I had to try it out to understand that it is really working. Now I will have to apply more power in order some part really works when I decide to use somewhere else.
Below are some pictures of the transceiver.
The front panel and mic. The microphone socket has a lot of pins and can handle some additional signals whatever they are.
Rear view. As you can see the antenna connector is BNC. Not a lot of contemporary transceivers has such a type of antenna connector.
The top lid is removed. A lot of SMD elements are exposed.
The monolithic PA from Motorola. Four pins are the ground, +12V DC, In, Out. This one is able to emit 6 watts.
This seems to be a bandpass filter. I have to examine it using my VNA.
Bottom PCB handles the analog part of the TRX. Nice view.
Bottom lid is removed. Nothing interesting.
I extracted the BPF. Nice specimen of a good design. Will test it soon.
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