request I removed my KENWOOD TM-701 from the truck I use at work for voice ID! If anyone has a radio that can produce tone on UHF, I would appreciate it if you could provide it.
UHF antennas for home uplink and local link also went up
The radio signal received by the FT-8900 at 29.540 MHz is retransmitted at 431.00 MHz to a downlink located 10 km away in a mountain farmland.
I put a 50W 1 ohm resistor in the power line. I plan to build a circuit that detects the voltage generated here and prevents continuous transmission. (At 10W 5 ohms, the voltage drop was so great that the radio turned off.)
FT-847 was used for beacon transmission until now
Here is the downlink facility The radio below is for voice ID transmission
This is TM-701 for voice ID transmission Transmission is made by interrupting the frequency for the link on the downlink side No antenna connected, dummy load.
Akizuki's K01-A voice recorder and Kyoritsu Electronics' AVR ATmega168 general-purpose kit ATmega168 only needs to make an interval of every 10 minutes to activate the voice recorder! PTT is put from the BusyLED on the voice recorder to the PTT on the radio through a photo coupler