Same frequencies?

JG-103 · Post by **JG-103** » Thu Oct 20, 2005 2:36 pm

Is it just my scanner picking up the wrong waves or are some of the same channels also on different frequencies? last night i was listening to channel 12- 468.1250 and noticed it was ch16- 468.2250, i also found another channel but have forgotten it that was exactly the same as another, same person, same job details. So is is my scanner picking up the wrong waves or do some channels also on 2 frequencies?

Post by **vk6hgr** » Thu Oct 20, 2005 3:40 pm

JG-103 wrote:Is it just my scanner picking up the wrong waves or are some of the same channels also on different frequencies? last night i was listening to channel 12- 468.1250 and noticed it was ch16- 468.2250, i also found another channel but have forgotten it that was exactly the same as another, same person, same job details. So is is my scanner picking up the wrong waves or do some channels also on 2 frequencies?

The police link some of their channels together to cover a greater area. Ch 2 and 8, 48,50,52 etc. Your scanner is working fine

Walks · Post by **Walks** » Fri Oct 21, 2005 3:12 am

.

Walks.

radiohead · Post by **radiohead** » Fri Oct 21, 2005 6:59 am

Hey hopefully this will help...
It took me a while to realise this too..
Sorry about the size, i tried to simplify the best i could

CH FREQ AREA
2 467.875 Armadale - Links to channel 08
8 468.025 Armadale - Links to channel 02

12 468.125 Fremantle - Links to channel 47, 16
13 468.150 Perth CBD - Links to channel 34, 18
16 468.225 Rockingham - Links to channel 12, 47
17 468.250 Mandurah
18 468.275 Perth CBD - Links to channel 34, 13
21 468.350 Mirrabooka - Links to channel 41, 62
23 468.400 Fremantle - Car to Car
26 468.475 Perth - Car to Car and Emergencies
30 468.575 Enquiry Channel - East of River
34 468.675 Perth CBD - Links to channel 13, 18
35 468.700 Enquiry Channel- South of River
41 468.850 Mirrabooka - Links to channel 21, 62
45 468.950 Perth CBD - spare/ Command Post
46 468.975 Midland - Links to channel 54, 49
47 469.000 Fremantle - Links to channel 12, 16
48 469.025 Warwick - Links to channel 50, 57
49 469.050 Midland - Links to channel 54, 46
50 469.075 Joondalup - Links to channel 48, 57
51 469.100 North Suburbs - spare
52 469.125 Wanneroo - Links to channel 48, 50, 57
54 469.175 Midland - Links to channel 46, 49
57 469.250 Quinns Rock - Links to channel 48, 50
58 469.275 Enquiry Channel- North of River
62 469.375 Mirrabooka - Links to channel 21, 41
63 469.400 South/Country - Car to Car
64 469.425 South/Country

Same is heard on each of the 'Areas' channels/frequencies no matter which one you are listening to eg: If you tune into only the 3 Fremantle channels for experiments sake, flick through them as someone is speaking (ch12 to 16 to 47) and you will hear the same broadcast.. By the way all 3 enquiry channels are the same one person operating those also! Only one radio operator works for each district/area at any one given time. Im sure i'l be corrected if im wrong!

Where do repeaters come into this, are they the channels that are 'repeated' or are they the signal towers or something?

JG-103 · Post by **JG-103** » Fri Oct 21, 2005 9:13 am

I cant remember, i think that the towers are the repeaters but i dont think they are called repeaters because they repeat the same channel on different frequencies because the fire brigade doesnt have the same channel on different frequencies, im pretty sure they are called repeaters because they transmit the message from tower to tower or something, where as with simplex you more or less rely on in sight. I can find out 4 sure but im sure ill be corrected anyway but i can still find out 4 sure. I would presume the fire brigades, ambulance and police use the same towers otherwise there would be towers every where, i know Hope Valley FRS has a map that shows all the repeaters in the metro area and tell you what channels they are and everything, me and chris are going to see if we can get a copy and post it in the fire forum.

JG103

JG-103 · Post by **JG-103** » Fri Oct 21, 2005 9:16 am

CORRECTION
just found a definition, a repeater receives a signal on one frequency, then in real time transmits the received signal on another frequency. They are generally located atop tall buildings or mountains, where their signal will reach far further then a normal 'simplex' signal. Repeaters form the basis of most two-way radio systems.

But im quite sure the fire brigades dont have the same channel on different frequencies and we have repeaters

JG103

dazla · Post by **dazla** » Fri Oct 21, 2005 9:27 am

VKI normally have two operators on enquiries. Northside and Southside.

Imagine only one enquiry operator for the whole of metro, the que would go for miles.

Post by **vk6hgr** » Fri Oct 21, 2005 10:27 am

JG-103 wrote:. I would presume the fire brigades, ambulance and police use the same towers otherwise there would be towers every where,

In Perth at least the emergency services don't seem to share sites. The police have several repeaters on the top of Central Park tower etc but neither SJA nor FESA have a spot there.

radiohead · Post by **radiohead** » Fri Oct 21, 2005 2:24 pm

Thanks for clearing that up JG-103, so I was on the right track haha!

Dazla, what about the East enquiries channel? I thought I'd heard the same person on all 3 enq channels at the one time but I could be mistaken

chrissss · Post by **chrissss** » Sat Oct 22, 2005 8:50 am

fesa used the same frequincie for 2 channels but they make sure 1 channel is NOR and 1 is SOR so ther is no confusion

like 30 and 80 are the same freq
but 30 is 6ip outer metro north
and 80 is 6ip outer metro south

i think...................

WA Radio Scanner Users' Group

Same frequencies?

Same frequencies?

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