Understanding Broadcast Frequencies: Do Fire Brigades or Police Share Frequencies?

in the army (90s) I was taught about spare frequencies, e.g. a popular radio for combat vehicles allowed me to prepare (a kind of analog / mechanical memory) a total of four. The backup frequency was implicit. The guard or the police act less "in the face of the enemy", I do not know how similar it is. The higher-level command vehicles had 2 radio stations according to the classification "up" "down", because there is also such an element of the organization.

Many serial firefighter radios have the option of only two channels set on the site. Perhaps they are programmed on the channel of the own and the superior unit, but this is a presumption.
In general, with professionals there is no such thing that a "field" officer will set the frequency he chooses. They are not radio enthusiasts, they work in stress, etc ... there is no point in giving them such a "convenience"

JacekCz wrote:

in the military (1990s) I was taught about backup frequencies

JacekCz wrote:

In general, there is no such thing in professionals that "off-road" the officer will set the frequency he chooses

Why would he do this? , (probably so that he does not hear commands, or maybe so as not to eavesdrop on him).
Thus: "off-road" the commander of the rescue operation has no "right" to demand from his "subordinates" to switch the TRX to another channel so as not to block the primary
Best regards.

The police transmit on a frequency of 172.250 MHz, in NFM modulation (i.e. narrow FM)
I do not recommend broadcasting on this frequency, you know how it will end.
You can only listen.

Rezystor240 wrote:

The police transmit on a frequency of 172.250 MHz, in NFM modulation (i.e. narrow FM)

If you say so, maybe it is. (not some services still use analog FM_ek) .

Rezystor240 wrote:

I do not recommend broadcasting on this frequency, you know how it will end.

And here I 100% agree with you, I would only add that transmitting on any frequency without authorization may also end up in the same.
Best regards.

The fire brigade has about 50 channels (different frequencies) assigned, including rescue and firefighting channels assigned to various actions by the person who chooses the situation, provincial channels, nationwide channels, local channels for local units of the State Fire Service and the TSO. The whole system is tied together, so in an extreme (imaginary) situation, for example, you could hear, for example, the voivodeship command from Greater Poland in Krakow or, for example, the commander of the PSP Headquarters in Gdańsk.

gumisie wrote:

If you say so, maybe it is so (not some services use analog FM_ek).

For example, trains talk at 150,150MHz
Here you can hear: '' 45WE ready to leave behind the Skierniewice Rawka station ''

Added after 14 [minutes]:

gumisie wrote:

And here I 100% agree with you, I would only add that transmitting on any frequency without authorization may also end up in the same.

Already one of the other 'connected' to the frequency of the trains and did not do well.

http://www.polskieradio.pl/5/3/Artykul/353765...ymywali-pociagi-za-pomoca-nadajnika-radiowego

Rezystor240 wrote:

Here you can hear: '' 45WE ready to leave behind the Skierniewice Rawka station ''

You can also hear "The train from Warsaw to Gdynia is delayed by the planned two hours, travelers are asked to step away from the tracks.

Rezystor240 wrote:

gumisie wrote:
And here I 100% agree with you, I would only add that broadcasting on any frequency without authorization may also end up in the same.


Already one of the other 'connected' to the frequency of trains and they did not do well at it .

And how were they supposed to leave.
Best regards.

gumisie wrote:

You can also hear "The train from Warsaw to Gdynia is delayed by the planned two hours, travelers are asked to step away from the tracks.

Yes, but you hear it on the platform from the loudspeaker
And not at home, almost 1000m from the platform.

gumisie wrote:

Already one of the other 'connected' to the frequency of the trains and did not do well.

They did not connect, but played with the PKP "radio" signal, causing confusion. And since it almost resulted in an attempt to overthrow democracy, a coup d'état and sabotage, the boys did not see their families a bit. Overall it looks like the radio spectrum is ordered and divided. Each service has its own frequency range, divided into channels, and units each use their own. Information easily available on the web.

robokop wrote:

They did not connect, but played with the PKP "radio" signal, causing confusion.

They played with the radio-stop signal, which should only be used in emergency situations.
But they sent him 'just for fun'
And one of them was a subway driver.

robokop wrote:

the guys haven't seen their families a bit.

No, all three of them received a hinged sentence, so they missed the boarding house.

I greet my friend, yes2mike.

Hello.
@robokop ,, I regret to say that it was not gummy bears he wrote:

robokop wrote:

gumisie wrote :
Already one of the other 'connected' to the frequency of the trains and did not do well.

but # 7)

Rezystor240 wrote:

Already one of the other 'connected' to the frequency of the trains and did not do well.

Gumisie advises against, warns what such fun may end with. # 5, # 8

gumisie wrote:

Rezystor240 wrote:
I do not recommend broadcasting on this frequency, you know how it will end.
gummy, replied:
And here I 100% agree with you, I would only add that broadcasting on any frequency without authorization may also end up in the same.

May I "fart" and not a tragedy of innocent people.
Best regards.

back to the point: in my area, the services do not have common frequencies. This is probably due to the fact that the relevant services have their ranges assigned. The guard has a general voivodeship channel - for me it is 149.100MHz. But generally, during rescue operations, they go to the Rescue and Fire-Fighting Canals - there are 8 of them. Then they do not unnecessarily block the main canal for the region.
It may also be surprising sometimes that I hear the guards on 147.8875 and immediately on 171.025MHz - it turns out that they have a relay installed that allows them to communicate in mountainous terrain.
I ordered a policeman friend of mine - a small piece of equipment - Zastone ZT2R - as a receiver of other services - so that he would know what was going on. The problem of common frequencies has been raised by the services for a long time - but the topic is not very moving forward in my area. Maybe the inevitable digitization will change something - but then we will have nothing to listen to ...

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Rezystor240 wrote:

robokop wrote:

They did not connect, but played with the PKP "radio" signal, causing confusion.

They played with the radio-stop signal, which should only be used in emergency situations.
But they sent him 'just for fun'
And one of them was a subway driver.

robokop wrote:

the guys haven't seen their families a bit.

No, all three of them received a hinged sentence, so they missed the boarding house.

I greet my friend, yes2mike.

Rumor had it that 2 out of 3, it was half a year in Łowicz on vacation for the case.

Rezystor240 wrote:

The police transmit on a frequency of 172.250 MHz, in NFM modulation (i.e. narrow FM)

Of course, not only at 172.250 MHz.
Wrocław is 164,525-167,475 and 172-174.

Interesant wrote:

Rumor had it that 2 out of 3, it was half a year in Łowicz on vacation for the case.

Not true, I know this case, no one was sent to ZK Łowicz.
Please come back to the topic.

czacheur wrote:

Rezystor240 wrote:

The police transmit on a frequency of 172.250 MHz, in NFM modulation (i.e. narrow FM)

Of course, not only at 172.250 MHz.
Wrocław is 164,525-167,475 and 172-174.

I gave the frequencies used in my city.
The same with 150,150MHz trains, i.e. the 2nd channel in my city is valid.

Rezystor240 wrote:

I gave the frequencies used in my city.

Yeah. In towns where there is one unit, one frequency is used. There are more units in Wrocław, hence my previous post.

Let us add to this the services that use ripiters with a fairly large distance TX / RX (probably KMP Koszalin), the Fire Brigade, which, in addition to operating channels, uses frequencies for remote activation of OSP sirens, railway, where in addition to 10 road channels (R 0 - R 9), the topography of which on the network is generally known - also uses frequencies intended for shunting traffic, locomotive sheds, depot and work trains. Juice players also have their own nationwide channel. Aviators and sailors have their own table. I do not know if any of my colleagues also pointed out that many professional portable devices do not have the ability to adjust the volume "to zero" - so that the user could not mute it completely. They are also called cooperation channels to coordinate the work of services in the event of major events. Finally, a Police officer has the option of summoning the emergency service or the fire brigade on duty through his station without the mediation of his dispatcher. The subject is a river, a longer discussion is preparing ...

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@jkk you put everything into one boiler. While until recently the operator responsible for radio communication on the Railway was TK-Telekom, now, after the division and sale of TK-Telekom, it was taken over by PKP-PLK through its daughter company - PKP-U Maintanie. Returning to the merits, on the PKP-PLK tracks there are simplex channels with a 25kHz step and, apart from 8 road channels and two maintenance channels, the rest of the channels (Manewrowe, Rewidenckie from the 150MHz band) used by carriers from the PKP group are leased from PKP-PLK, otherwise As for private carriers using their own infrastructure, then the passage or maneuvers on the siding can take place in the 171MHZ band with a channel spacing of 12.5kHz. Government services subordinate to the Ministry of the Interior have several bands, the most famous are several sections in the VHF band (For WCZK, PSP, SW, BOR, PP, etc.). There, communications can be simplex, doubleimplex (through "simple" converters and Trunking zone converters) with 6.25-12.5-25.0kHz channel spacing. In the case of single repeaters, a given service uses the same two frequencies (Channel), In the case of Trunking Zones, different services may use the same group of channels