934

[Twocky61]

As well as 27mhz FM/VHF radio also had a UHF band on 934mhz FM secondary frequency though since then 934 has been reallocated to mobile phones

We subsequently had allocated to 40 Euro channels. So even though we lost 20 channels we gained 40

[staffslad]

Re: 934

My knowledge on the technical side of radio is quite limited. I am struggling to remember seeing any radios I have seen having a UHF band. In the early 70s my parents bought a secondhand B/W TV that, I think, had a UHF band. There were the usual channel push buttons--six I think, that you twisted to find a channel, but also a rotary knob with pre-selected channels that you could click to. I think these channels were single or at most double digits printed around the selector knob. It did say UHF and VHF on the buttons and knob, but which was which I can't remember.

[Twocky61]

Re: 934

Analogue TV was around 800mhz UHF band.

Basically below 300mhz is VHF over 300mhz is UHF

Medium wave is in kHz & FM/VHF is mhz

[Twocky61]

Re: 934

UK CB Frequencies: (for all us geeks out there lol)


FREQUENCY CHANNEL
27.60125 01
27.61125 02
27.62125 03
27.63125 04
27.64125 05
27.65125 06
27.66125 07
27.67125 08
27.68125 09
27.69125 10
27.70125 11
27.71125 12
27.72125 13
27.73125 14
27.74125 15
27.75125 16
27.76125 17
27.77125 18
27.78125 19
27.79125 20
27.80125 21
27.81125 22
27.82125 23
27.83125 24
27.84125 25
27.85125 26
27.86125 27
27.87125 28
27.88125 29
27.89125 30
27.90125 31
27.91125 32
27.92125 33
27.93125 34
27.94125 35
27.95125 36
27.96125 37
27.97125 38
27.98125 39
27.99125 40

[staffslad]

Re: 934

Thanks, Twocky.

Re CB radio. Never had a CB set, but the guy who lived across the road from us had a big CB aerial on his roof. I would say he was about 30ft from us. This was the early 80s--83 or 84 most probably. I had an Amstrad music centre with record deck, radio and twin cassette deck in a tower configuration. If I plugged in my headphones I could hear him when he was on his CB set very clearly, but not the person he was talking to, and if I played a record or cassette I couldn't hear him anymore. I guess the headphone lead was acting as an aerial and picking up his transmissions due to his proximity.

[Twocky61]

Re: 934

Similar to that channel bleed Staffslad there were breakers who transmitted higher than the legal four watts using a linear amplifier better known as a burner.

Some transmitted at 500 watts and beyond. They bled over ten channels up & down from the one they were on

MPT1320 (the band width allowance) states that all transmissions on CB are not allowed to exceed four watts. There are lower wattage facilities on CB rigs: Quarter of a watt & one watt

https://www.ofcom.org.uk/__data/asse...izens-band.pdf

[staffslad]

Re: 934

Wow! There's quite a difference between 4W and 500W. No idea what the guy over the road from us was doing transmitting power-wise. I don't recall anyone else complaining they were picking up his signal, so maybe it was just me who heard it. He moved house about a year later, and I can't quite remember after 30+ years if the council made him take the aerial down over some infringement--maybe planning permission was needed and he didn't get it, but it's all rather hazy now.

[Twocky61]

Re: 934

The maximum power available is 1k watts similar to that on military radios such as the Clansman 343

To transmit at that amount of wattage all military rigs will only allow fifteen second bursts at 1k. It is used for getting over any jamming the enemy is doing to your frequency