[Motorola] Strange HT-220

[k0dan]

Might be an EMS radio with a modulator for EKG data. These dated from the mid 70's, were an SP product built in Plantation, and had a toggle switch to select voice, EKG, or multiplex. These ran 1W and were meant to communicate thru a mobile repeater (Memcom) in the ambulance. As originally crystaled they used the 458 mhz med channels on TX and the 468 mhz med channels on receive. They often used the 463/468 mhz med dispatch channels too.
 

 

 

 

 
 
 
 
 
>  
> On Apr 29, 2023 at 07:52, Tom B  <tbryan at nova.org>  wrote:
>  
>  
>  Hello All,
>
> I picked up a strange HT-220 radio. I have worked on a lot of HT-220s 
> but I have not seen one like this. It is marked Z24FFP3191A. There are 
> no SP markings. It is 6 channel omni, remote speaker mic only, no 
> speaker or mic is internal. There is not even a place for the speaker 
> or mic inside, but the front looks like a normal HT-220. There is also 
> a board in the omni frame that I cannot identify. The board is not 
> complex, so it is not encryption. This is an early A model. Anybody 
> know about this model?
>
> Tom
> N3AJA
>
>
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