[aprssig] NMO

[Rod,VE1BSK]

Thanks to all who advised me re the correct meaning of "NMO" and above all 
to Bob, who went into some of the history of the connection and made it that 
much more meaningful. Again, tnks to all, 73 de Rod,VE1BSK.
----- Original Message ----- 
From: "kd7nm" <kd7nm at pugetsound.net>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Tuesday, May 09, 2006 9:07 PM
Subject: Re: [aprssig] NMO


> NMO = "New Motorola", as in a specific mobile antenna base
> style.  It's not really new any longer, since it's existed
> since at least the mid-70's, since that's about when I
> started looking at Larsen antenna models, with the wide
> variety of mounts they work on.
>
> One of the mechanical properties of the NMO antenna mount is
> that all of the versions I've seen of it to date are based
> on being mounted through a 0.75" hole.  The mount is popular
> enough that both Motorola, and at least one other company,
> have created a special drill bit for making that hole
> through the roof of a car, while minimizing how far below
> the roof the bit extends - so as to protect the interior
> ceiling liner of the car from being damaged by the bit.  One
> of them also has a surface designed to expose bare metal to
> improve the grounding of the antenna base to the vehicle
> roof sheet metal.
>
> I suspect that whatever the original (or older) Motorola
> antenna mount was like, didn't work well at UHF.  And the
> NMO mount has been improved since then, to make it work at
> even higher frequencies without as much of an impedance
> bump.
>
> 73, Bob, KD7NM
>
> ----- Original Message Follows -----
> From: "Rod,VE1BSK" <rodpadmore at ns.sympatico.ca>
> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
> Subject: [aprssig] NMO
> Date: Tue, 9 May 2006 14:51:33 -0300
>
>>Pse tell me what this acronym means in antenna adverts. I
>>can only find it meaning,"Nuns, Mothers and Others" on the
>>web and I suspect this is not the meaning I am looking
>>for(hihi), tnx es 73 de VE1BSK,Rod.
>>
>>
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