Nimitz Carrier Handheld Radio

[RaleighGuy]

Rear Adm. Jim Kirk, commander, Nimitz Carrier Strike Group, spoke with President Joe Biden during a conference call aboard the aircraft carrier USS Nimitz (CVN 68) during Superbowl LV. Keeping his radio close by in case he needed to handle any ship board situation.

 

[blantonl]

Looks like a Harris/MACOM P7100 UHF EDACS portable.

A lot of the carriers have older legacy UHF EDACS systems in the 406-420 MHZ band

 

[RaleighGuy]

Looks like a Harris/MACOM P7100 UHF EDACS portable.

A lot of the carriers have older legacy UHF EDACS systems in the 406-420 MHZ band

Thanks hoping someone would ID it and give some info.

 

[kf8yk]

AN/SRC-55 HYDRA system: Systems

 

[RaleighGuy]

A little closer look

 

[ecps92]

As well as some of the USNS Fleet in both 400-420 and 380-400

Looks like a Harris/MACOM P7100 UHF EDACS portable.

A lot of the carriers have older legacy UHF EDACS systems in the 406-420 MHZ band

 

[krokus]

My carrier used a Motorola UHF trunked system, with distributed antennas, and was called "MOMS Radio". It allowed comms for the crew in most of the ship, excluding some sensitive areas, where radios were not allowed.

 

[PACNWDude]

Very interesting. In a previous life, and maintaining comms on a fleet of dedicated oil spill response ships, we were replacing legacy UHF gear with 800MHz as it worked a lot better between decks and on large steel vessels. Did not expect to see UHF on a carrier in the present day. Thank you for sharing these pictures.

 

[ecps92]

the Federal Government has no allocations at 700/800/900 for LMR - most of the LMR they have [IMHO from monitoring] and use on-board is
400-420, 380-400, 457/467 [Yes same as Cruise/Cargo], 162-174 [Rare], 148-150.7 [Rare] and 138-144 [Rare]

Searching just the trunked info in the RRDB

RR Database Home

The most complete database of radio communications data

www.radioreference.com

RR Database Home

The most complete database of radio communications data

www.radioreference.com

Very interesting. In a previous life, and maintaining comms on a fleet of dedicated oil spill response ships, we were replacing legacy UHF gear with 800MHz as it worked a lot better between decks and on large steel vessels. Did not expect to see UHF on a carrier in the present day. Thank you for sharing these pictures.

 

[n4jri]

I'm curious about the architecture of some of these 406-420 radios. Down here, the only HYDRA I can ID is in the 380 range. But I've found a number of Motorola 3600 baud systems still in use in the 406 band. Have noticed in at least one case that offsets between transmit & receive freq are not consistent. (406.650out/416.475in, 408.850out/416.600in, and 407.075out/416.675in) Of course, they could be images, but again not a consistent relationship between input and output. Have not heard anything but control channels or dead carrier on 408.700. A number of systems also list 408.125, but I've only heard that freq in use on a P25 system using these same output freqs. (am presuming that on P25, there has to be a fixed offset interval between TX & RX freqs.)

73/Allen (N4JRI)

 

[ecps92]

Don't rule out the 457/467 band either for some USN/USNS

Altho a much in need of an update web site this might help on HYDRA

Systems

And many of these systems have been around/in service, LONG before the 9 mhz NTIA split was implemented, so YMMV from that aspect

I'm curious about the architecture of some of these 406-420 radios. Down here, the only HYDRA I can ID is in the 380 range. But I've found a number of Motorola 3600 baud systems still in use in the 406 band. Have noticed in at least one case that offsets between transmit & receive freq are not consistent. (406.650out/416.475in, 408.850out/416.600in, and 407.075out/416.675in) Of course, they could be images, but again not a consistent relationship between input and output. Have not heard anything but control channels or dead carrier on 408.700. A number of systems also list 408.125, but I've only heard that freq in use on a P25 system using these same output freqs. (am presuming that on P25, there has to be a fixed offset interval between TX & RX freqs.)

73/Allen (N4JRI)