Since March of 2020 many of us who get together at "8:35 on the 805" on Mid-Hudson mornings have appreciated the use of the Overlook Mountain Amateur Radio club '805' repeater.
Perish the thought, however, what would happen if for some extended period of time we were unable to communicate with one another so easily? Before the age of repeaters amateur radio operators had a clear understanding of their ability to 'relay' information from one to another using 'pure RF', no repeaters or internet required. Hence the name American Radio Relay League [ARRL].
The ARRL 2 meter ‘band plan’ is designed to reduce interference between all the modes (e.g., FM repeaters; CW; SSB; AM; satellite, amateur television [ATV]; and radio control operations which use this band.
The Frequency that amateur radio operators (hams) have agreed to set aside for the Simplex FM National Calling Frequency is 146.520 MHZ.
Once contact is made on 146.520 it is generally agreed that those wishing to continue a longer contact will move to adjacent frequencies that are 20 KHz apart from one another to avoid interference with other simplex and/or repeater transmissions.
Below are the ARRL Simplex Channels in 20 KHz channel steps.
146.480 (Plan B1 suggested)
146.520 (FM National Calling Frequency)
146.580 (Plan B2 suggested)
147.480 (Plan B3 suggested)
The ‘Plan B’ suggested simplex frequencies should avoid any interference with the OMARC 156.805 (-); OMARC 146.745 (-); OMARC 146.255 (+); Mt. Beacon 146.970 (-); Highland 147.045 (+) and Millbrook 146.895 (-) repeater inputs and outputs.
If you would like to participate in a test of our 'Plan B' 2 meter simplex communication capabilities leave a comment below or send us a message by clicking 'Contact' at the top of the page.