Milair Freqs?

[Victor69]

Hello, I know that the military aircraft (like our A-10's) use 3 types of radios,
1- Fox Mike Lowband FM 30.00 up uses a 151.4 tone squelch
2-Victor Vhf-hi AM Civilian aircraft freqs and some above it like 134.300am
3-Uniform UHF-AM 223.00 up Military aircraft.

My question is, does the VHF AM use any tones for squelch? Like above civil aircraft freqs.
Some of the freqs. they are using in an AM mode are the same freqs used on base in a FM mode??? While I am trying to listen to them,(AM MODE selected) the FM transmission comes over sounding nasty but I dont think the planes can hear it. Any help?
A-10 Wart Hawgs Rock Thanks

 

[Colin9690]

There are no squelch tones on the AM Air bands.

 

[nd5y]

Military 30 - 88 MHz FM sounds bad because they use 15 KHz deviation which
makes the signal about 40 kHz wide.

Scanners and most private land mobile radios use 5 kHz deviation (16 - 20 kHz bandwidth)
or NFM 2.5 kHz deviation (11 - 12 kHz bandwidth) and can only receive a signal up to
about 25 kHz wide.

On voice peaks the military signal will be wider than the receive passband of a scanner so it will
distort or chop out completely.

The NATO standard squech tone is 150.0 Hz not 151.4

The 138 - 150.75 band can have both AM aircraft and FM government land mobile but I have never
heard of anybody having AM and FM both on the same frequency in the same area.

 

[ka3jjz]

Military 30 - 88 MHz FM sounds bad because they use 15 KHz deviation which
makes the signal about 40 kHz wide.

Scanners and most private land mobile radios use 5 kHz deviation (16 - 20 kHz bandwidth)
or NFM 2.5 kHz deviation (11 - 12 kHz bandwidth) and can only receive a signal up to
about 25 kHz wide.

On voice peaks the military signal will be wider than the receive passband of a scanner so it will distort or chop out completely.

That might well be true where you are, but here in Maryland, the few times we hear an ANG unit on low band, we hear it just fine - no chopping or anything as you describe it. It's pretty rare, tho. Most activity for these type units - especially when they're chatting away - is in the 138-144 mhz band, AM mode. No sweat receiving these, either.

73s Mike

 

[DPD1]

Very little lowband stuff here in the west too... Even someplace busy like Bicycle AAF. There use to be a lot more in the old days, but what little that's left is encrypted or straight data.

Dave
http://www.dpdproductions.com
- Featuring the New MilTenna Omni Air Band Antennas -

 

[Victor69]

MilAir

Thanks guys, I did talk to one of our A-10 pilots, and he stated that the FOX MIKE, FM Lowband is used to talk to the troops on the ground for close air support like the Army asking for an air strike. And the tone squelch is 150.0 ONLY on the old fm stuff, the newer SINGGARS stuff will transmit the tone to talk to the older stuff but does not need it to receive....
Thanks again for the help.