The resistors change the frequency of the tone. In fact, some people may prefer 
the tone without any resistors at all… and sometimes (perhaps inadvertently) 
the tone frequency changes with updates to the software revision.

The team does test this feature, but I can’t say that I have first hand 
experience using it with a cable with that specific value resistor… so couldn’t 
tell you what it sounds like on the currently released version of software.

From: AF <af-boun...@af.afmug.com> On Behalf Of Ken Hohhof
Sent: Thursday, August 27, 2020 1:58 PM
To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com>
Subject: Re: [AFMUG] [ External ] Audio tune 450i SMs?

I bought one 450i SM by mistake once, I somehow thought the 3 GHz SM with the 
integral panel was discontinued when the 450b came out.  And I built one of 
those stupid cables, including the 220 ohm resistors (which I suspect aren’t 
really needed).  Have you tried to buy resistors lately?  No more Radio Shacks, 
Frys doesn’t carry components anymore, I found some in the discontinued items 
bin at MicroCenter.

Bottom line, when I realized I would also need a 48V POE, I put that SM on the 
shelf where it still sits today.  I’m not sure why you’d want one.  On top of 
everything else, it’s very expensive.  I think its claim to fame is the 
dynamically tuned front end filter, which I guess would help if you had 
extremely high adjacent channel interference.

I should really put it on eBay or something.

From: AF <af-boun...@af.afmug.com<mailto:af-boun...@af.afmug.com>> On Behalf Of 
Matt Mangriotis via AF
Sent: Thursday, August 27, 2020 12:38 PM
To: AnimalFarm Microwave Users Group <af@af.afmug.com<mailto:af@af.afmug.com>>
Cc: Matt Mangriotis 
<matt.mangrio...@cambiumnetworks.com<mailto:matt.mangrio...@cambiumnetworks.com>>
Subject: Re: [AFMUG] [ External ] Audio tune 450i SMs?

Sam – Please see this forum post…

https://community.cambiumnetworks.com/t/pmp450i-sm-alignment-tones/54898<https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcommunity.cambiumnetworks.com%2Ft%2Fpmp450i-sm-alignment-tones%2F54898&data=02%7C01%7Cmatt.mangriotis%40cambiumnetworks.com%7C7bf06b2dabba4e62576b08d84abb44ea%7C0e263e36340946228ac818d993e76eb6%7C0%7C1%7C637341515507837732&sdata=hWLd2jywJmoe4OtzpMWHsFupqHwciHIFsmWA%2BX8GTAI%3D&reserved=0>

Matt

From: AF <af-boun...@af.afmug.com<mailto:af-boun...@af.afmug.com>> On Behalf Of 
Sam Lambie
Sent: Thursday, August 27, 2020 12:27 PM
To: AnimalFarm Microwave Users Group <af@af.afmug.com<mailto:af@af.afmug.com>>
Subject: [ External ] [AFMUG] Audio tune 450i SMs?

I just installed my 1st 450i sm and am stumped on how to tune with an audio 
speaker like the old 450 and 450bs.

What am I missing?
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