Different Licensee's Same Frequency

KG5HHS · Jul 28, 2016

Hello,
I've noticed that in my area, Two different Licensee's have the same frequency. Shannon West Texas Memorial Hospital (WYZ278) and San Angelo Emergency Corps (WNWG781) are licensed with the same frequency of 155.2800MHz. I scan it all the time but don't every hear anything. My question is, how can two different licensee's have the same frequency?

KR3LC · Jul 28, 2016

I believe that particular frequency was or is used for ambulance to hospital comms so both facilities might use it at different times depending on which one an ambulance may be headed to. If you don't ever hear anything on it and you feel you are close enough to either facility that your should hear it then chances are your region is using the UHF MED frequencies or, like in Maryland, they have moved to regional trunked systems serving the various jurisdictions.

SteveC0625 · Jul 28, 2016

KG5HHS said:
Hello,

I've noticed that in my area, Two different Licensee's have the same frequency. Shannon West Texas Memorial Hospital (WYZ278) and San Angelo Emergency Corps (WNWG781) are licensed with the same frequency of 155.2800MHz. I scan it all the time but don't every hear anything. My question is, how can two different licensee's have the same frequency?

Probably an ambulance to hospital frequency. 155.280 was one of the channels used all over country for that. Others were 155.340, 155.400, & 155.295. It was as originally called the HEAR system. It was not uncommon for every ambulance service and hospital in a very wide area to have licenses on all of those frequencies.

Those are probably old licenses, perhaps still valid, from a time when those frequencies were used for that regularly in that area.

KG5HHS · Jul 28, 2016

Ah, ok, make's sense now. Thank you.

W8RMH · Jul 28, 2016

KG5HHS said:
My question is, how can two different licensee's have the same frequency?

From an "Industry Discussion" point of view it is not uncommon for one frequency to be licensed to several users especially in the business bands. PL/DPL tones are used to silence the other user's transmissions.

This can be an issue sometimes if the other user has a strong signal as it can block some users from receiving their own transmissions.

However in your case the other posts are correct as multiple hospitals and EMS agencies used the same frequencies to contact the hospitals.

troymail · Jul 29, 2016

There is tons of frequency reuse in my area - at least on the business bands. This became apparent when starting to look at DMR. The thinking is probably that the low power nature of some of the users makes it ok. However, while some signals are "small footprint" (i.e. don't go much past the intended facility or complex), some licensees in my area appear to have much stronger signals than one might expect.

As has been mentioned, separation is mainly done through CTCSS and in the DMR case, color codes. It also appears that many in my area - digital anyway - also try to make sure that the radio ID ranges and talkgroup IDs assigned are very obviously different.

Radioguy37 · Aug 2, 2016

Here in Illinois that frequency is for Hospital to Hospital, maybe thats why you never here anything. Back in the HEAR days the hospital had a rotary dial on their remote and they could dial a specific number for a specific hospital and they could talk direct. Of course this is in the pre-cellular days. It is still in the hospital radios in IL but i doubt, even in a disaster anybody would know to use it.

Different Licensee's Same Frequency

KG5HHS

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KR3LC

Member

SteveC0625

Order of the Golden Dino since 1972

KG5HHS

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W8RMH

Feed Provider Since 2012

troymail

Silent Key

Radioguy37

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