From tbryan at nova.org  Sat Apr 29 08:51:41 2023
From: tbryan at nova.org (Tom B)
Date: Sat, 29 Apr 2023 08:51:41 -0400
Subject: [Motorola] Strange HT-220
Message-ID: <d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>

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



From k0dan at comcast.net  Sat Apr 29 10:55:25 2023
From: k0dan at comcast.net (k0dan)
Date: Sat, 29 Apr 2023 09:55:25 -0500
Subject: [Motorola] Strange HT-220
In-Reply-To: <d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>
References: <d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>
Message-ID: <17be98b1-0205-46a3-8f9f-22439d247f6a@edison>

 
 
 
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
>
>
> ______________________________________________________________
> Motorola mailing list
> Home:  http://mailman.qth.net/mailman/listinfo/motorola
> Help:  http://mailman.qth.net/mmfaq.htm
> Post: mailto:Motorola at mailman.qth.net
>
> This list hosted by:  http://www.qsl.net
> Please help support this email list:  http://www.qsl.net/donate.html    
     

From tbryan at nova.org  Sat Apr 29 14:51:05 2023
From: tbryan at nova.org (Tom B)
Date: Sat, 29 Apr 2023 14:51:05 -0400
Subject: [Motorola] Strange HT-220
In-Reply-To: <17be98b1-0205-46a3-8f9f-22439d247f6a@edison>
References: <d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>
	<17be98b1-0205-46a3-8f9f-22439d247f6a@edison>
Message-ID: <47b394a8-72e9-44a6-5b50-8b7a99021697@nova.org>

The only external connection is to the speaker mic.? It looks just like 
any other HT-220.? The only controls are a channel selector, PL, and 
Vol. and Sq.

Tom

On 4/29/2023 10:55 AM, k0dan wrote:
>   
>   
>   
> 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
>>
>>
>> ______________________________________________________________
>> Motorola mailing list
>> Home:  https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
>> Help:  https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
>> Post: mailto:Motorola at mailman.qth.net
>>
>> This list hosted by:  https://urldefense.com/v3/__http://www.qsl.net__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
>> Please help support this email list:  https://urldefense.com/v3/__http://www.qsl.net/donate.html__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$
>       
> ______________________________________________________________
> Motorola mailing list
> Home: https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
> Help: https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
> Post: mailto:Motorola at mailman.qth.net
>
> This list hosted by: https://urldefense.com/v3/__http://www.qsl.net__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
> Please help support this email list: https://urldefense.com/v3/__http://www.qsl.net/donate.html__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$

From k0dan at comcast.net  Sat Apr 29 18:02:29 2023
From: k0dan at comcast.net (k0dan)
Date: Sat, 29 Apr 2023 17:02:29 -0500
Subject: [Motorola] Strange HT-220
In-Reply-To: <17be98b1-0205-46a3-8f9f-22439d247f6a@edison>
	<47b394a8-72e9-44a6-5b50-8b7a99021697@nova.org>
References: <17be98b1-0205-46a3-8f9f-22439d247f6a@edison>
	<d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>
	<47b394a8-72e9-44a6-5b50-8b7a99021697@nova.org>
Message-ID: <61265708-4612-42e8-b892-5bb7b7cb1fe3@edison>

 
 
 
The way you describe it I'm almost certain this is a cardiac telemetry radio. IIRC the patch electrodes were connected to the speaker mic... Maybe also the radio front cover in some models. This was a precursor to the "orange box" and later the "white box" full duplex treatment radios.
 
73
 
K0DAN
 

 

 

 

 
 
 
 
 
>  
> On Apr 29, 2023 at 13:51, Tom B  <tbryan at nova.org>  wrote:
>  
>  
>  The only external connection is to the speaker mic. It looks just like 
> any other HT-220. The only controls are a channel selector, PL, and 
> Vol. and Sq.
>
> Tom
>
> On 4/29/2023 10:55 AM, k0dan wrote:
> >  
> >  
> >  
> >  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
> >>
> >>
> >>  ______________________________________________________________
> >>  Motorola mailing list
> >>  Home: https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
> >>  Help: https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
> >>  Post: mailto:Motorola at mailman.qth.net
> >>
> >>  This list hosted by: https://urldefense.com/v3/__http://www.qsl.net__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
> >>  Please help support this email list: https://urldefense.com/v3/__http://www.qsl.net/donate.html__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$
> >  
> >  ______________________________________________________________
> >  Motorola mailing list
> >  Home: https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
> >  Help: https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
> >  Post: mailto:Motorola at mailman.qth.net
> >
> >  This list hosted by: https://urldefense.com/v3/__http://www.qsl.net__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
> >  Please help support this email list: https://urldefense.com/v3/__http://www.qsl.net/donate.html__;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$
> ______________________________________________________________
> Motorola mailing list
> Home:  http://mailman.qth.net/mailman/listinfo/motorola
> Help:  http://mailman.qth.net/mmfaq.htm
> Post: mailto:Motorola at mailman.qth.net
>
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> Please help support this email list:  http://www.qsl.net/donate.html    
     

From tbryan at nova.org  Sat Apr 29 18:06:31 2023
From: tbryan at nova.org (Tom B)
Date: Sat, 29 Apr 2023 18:06:31 -0400
Subject: [Motorola] Strange HT-220
In-Reply-To: <61265708-4612-42e8-b892-5bb7b7cb1fe3@edison>
References: <17be98b1-0205-46a3-8f9f-22439d247f6a@edison>
	<d2999070-5735-1c0a-6f27-8d55fa96a005@nova.org>
	<47b394a8-72e9-44a6-5b50-8b7a99021697@nova.org>
	<61265708-4612-42e8-b892-5bb7b7cb1fe3@edison>
Message-ID: <dc2816bf-25da-989f-ef1a-b00c0844c324@nova.org>

Interesting.? Thank you for the information.

Tom


On 4/29/2023 6:02 PM, k0dan wrote:
> The way you describe it I'm almost certain this is a cardiac telemetry 
> radio. IIRC the patch electrodes were connected to the speaker mic... 
> Maybe also the radio front cover in some models. This was a precursor 
> to the "orange box" and later the "white box" full duplex treatment 
> radios.
> 73
> K0DAN
>
>
>
>> On Apr 29, 2023 at 13:51, Tom B <tbryan at nova.org> wrote:
>>
>> The only external connection is to the speaker mic.? It looks just like
>> any other HT-220.? The only controls are a channel selector, PL, and
>> Vol. and Sq.
>>
>> Tom
>>
>> On 4/29/2023 10:55 AM, k0dan wrote:
>> >   
>> >   
>> >   
>> > 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
>> >>
>> >>
>> >> ______________________________________________________________
>> >> Motorola mailing list
>> >> Home:  https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;  <https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxdIyfz5o$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
>> >> Help:  https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;  <https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxf-bA3h0$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
>> >> Post: mailto:Motorola at mailman.qth.net
>> >>
>> >> This list hosted by:  https://urldefense.com/v3/__http://www.qsl.net__  <https://urldefense.com/v3/__http://www.qsl.net____;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcx9bqFdAY$>;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
>> >> Please help support this email list:  https://urldefense.com/v3/__http://www.qsl.net/donate.html__;  <https://urldefense.com/v3/__http://www.qsl.net/donate.html__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxqkRwZUA$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$
>> >       
>> > ______________________________________________________________
>> > Motorola mailing list
>> > Home: https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;  <https://urldefense.com/v3/__http://mailman.qth.net/mailman/listinfo/motorola__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxdIyfz5o$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6HKeTpA$
>> > Help: https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;  <https://urldefense.com/v3/__http://mailman.qth.net/mmfaq.htm__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxf-bA3h0$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDqTKVdIw$
>> > Post: mailto:Motorola at mailman.qth.net
>> >
>> > This list hosted by: https://urldefense.com/v3/__http://www.qsl.net__  <https://urldefense.com/v3/__http://www.qsl.net____;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcx9bqFdAY$>;!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYDBy71FbU$
>> > Please help support this email list: https://urldefense.com/v3/__http://www.qsl.net/donate.html__;  <https://urldefense.com/v3/__http://www.qsl.net/donate.html__;__;!!KfGNmQmE!n7udS0Qz-xkDt4y1tVQ-q3mON49-YBU-CZuOFlM5p_6hZPYu4ATFQN0HHBRIOBD6yOcxqkRwZUA$>!!KfGNmQmE!klG9uMB3a-e3xz7zEmDkKH6Dhx9Fkk8MT0weZOMcYzQbehTFsZl9AVKwsgj0nwcPqiYD6CAswmc$
>> ______________________________________________________________
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>> Post:mailto:Motorola at mailman.qth.net
>>
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>>