Re: Prevent two multi-op stations on the same band

Michael Walker

Technical comment

In most radios, the Front End has exposure to all the RF at the antenna port unless there is an antenna disconnect or some sort of Band Pass Filter in front.  Each radio is different and you will have to check your schematics and or manufacturer.  This can also be a problem if the radio is even turned off.  

Flex radios can handle in band RF to some pretty high levels.  They warn the user at about 8dbm range and then shutdown at 15dbm at the antenna port.  At that point, the front end is clamped to ground and very well protected.

Mike va3mw

On Tue, Oct 22, 2019 at 9:37 AM Ted Bryant <tlbryant02@...> wrote:

“…N1MM+ still allows the two radios to be tuned to the same band…” – If and only if you manually select the bands directly from the radio(s).  But that bypasses N1MM’s control and it should be avoided if you want N1MM to protect the radios.


73, Ted W4NZ


From: [] On Behalf Of Brian Machesney
Sent: Monday, October 21, 2019 8:31 AM
Subject: [N1MM+] Prevent two multi-op stations on the same band


The front end of a radio could be damaged if two radios are tuned to the same frequency at the same time and either one transmits. This could happen, for example, if a radio's band-change mechanism requires cycling through sequential bands. This is a different problem than preventing two radios from transmitting on the same band at the same time.

Of course, one could change bands with N1MM+ instead of using the radio's front-panel control to cycle through the bands, but N1MM+ still allows the two radios to be tuned to the same band. Since N1MM+ "knows" everything about two networked stations and can even prevent a "mult" station from calling CQ, so it seems as though it could prevent a station from attempting to move onto a band that another radio is already using.

Is there a switch somewhere in the program to effect this behavior?

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