SRD860 - "could" be legal for voice in the UK ?? (500mW??)

[bigbloke]

Wind'

ive replied in your other thread in"grey and commercial"

regards

BB

[mayhemicmayhem]

Having read IR2030 it would appear that 868-870mhz is also legal for voice transmission. Why don't Midland Alan then make their Alan 860 radios available here?

[M3HIM]

I just pulled out a 800 Mhz Kenwood and I can confirm it does all the frequencies below.
That's just after I spent a incredible number of hours getting a Kenwood to do all the
"Euro 933/934 channels. and, have some half build antennas sitting in the workshop.
Wife has me flat out on renovations so the radio projects have to wait till
the sawdust is all gone.

Ramjet

Hi All,
XV = 868.0- 868.6 MHz 25 mW e.r.p. (SRD 860 band A)
XVI = 868.7- 869.2 MHz 25 mW e.r.p. (SRD860 band B)
XVIII = 869.40- 869.65 MHz 500 mW e.r.p. (SRD860 band C)
XXIV = 863 – 870 MHz 25 mW e.r.p. (includes all of SRD 860 and cordless headphone band)

BB

Hi, I'm a late entry to this thread so please excuse the 'catch-up' questions.

Which Kenwood are you using for the 800MHz SRD bands?

What are the Euro 933/934 channels that you refer to. They sound like the sort of frequencies that would get a lot of QRM from PC CPU clocks!

It looks like both the 800MHz and, in particular, the 900MHz bands mentioned are in among the GSM mobile phone bands. I would expect that frequencies in this range are in great demand and wonder how long they can last as UMTS (3G) begins to encroach on GSM/EGSM (2.xG) spectrum.

[wind in the antenna]

The 860 MHz SRD bands are I believe protected from other use on a Europe wide basis. http://www.atcb.com/publicdocs/New-CEPT ... cument.pdf They sound very noise free to me here. I'm putting up a beam tomorrow and will be listening out.

[RogerD]

Is 864 the new 934 band now? Why 864 when that's amongst low power headphones and stuff likely to suffer from interference in the 863-865 band?
Wouldn't the 500mW section at 869 be better?

73

[wind in the antenna]

The 934 MHz band was legalised for CB in 1981 in the UK giving 20 channels of 25 kHz bandwidth at 50 kHz spacing. The Cybernet Delta 1 has a modification to add another 20 channels in the interleaved whitespace. The Swiss had 934 MHz too but in addition, another similar band within 933 MHz. All 933 / 934 MHz services have of course been sold as a huge cash cow to mobile phone operators.

Within the licence exempt cordless mic / headphone band is 864.8-865MHz which is used for 50kHz narrow band voice devices with analogue speech allowed at 100% duty cycle to a maximum of 500mW. There is a section around 869 MHz but depending which source you refer to, it does not permit analogue voice or speech. I also had trouble programming my Vertex's to this area due to a quirk in the software but I'm still looking into it.

[RogerD]

OK thanks, well, good luck with that, bit too high a frequency for me

How many takers do you estimate you'll get for this hobby band - more or less activity than amateur 1290MHz?

Cheers

[wind in the antenna]

OK thanks, well, good luck with that, bit too high a frequency for me

How many takers do you estimate you'll get for this hobby band - more or less activity than amateur 1290MHz?

Cheers

Well that I don't know. I've been doing my best to expand the cause and the greatest thing is that a beam will have enough bandwidth for both 934 and the SRD 860 bands. Given the price of a Delta 1, I would imagine that it's not just me who is itching to get a copy on 934.

I see more of a future on the SRD bands though and if we're smart about it, we could have a very interesting successor to CB/934/81 right there.

1290MHz is a little high for me too. Most of my test equipment only goes up to 1GHz although I've played with ATV on 13 and 23cms. The North American 33cms gets little use.

860MHz is far more manageable and I'm hoping it will gather momentum.

[RogerD]

I just can't help wondering if people will ask What's the point - given that it's not quite twice the frequency of 446, what does it offer apart from being different?
OK, so aerial elements can be roughly half the length of 446 ones, making longer beams more manageable - is that enough on its own? Is it just the appeal of being new, where every new experimenter is very welcome indeed?

Interesting though
73

[wind in the antenna]

That's about it I guess, we do it because we can. I missed out on 934 CB at the time and now the band belongs to someone else and yet there is a band which we can legally use. PMR 446 does get a bit busy at times and it would be nice so seek some refuge from toy spacegun call tones. I'm interested in how propagation works out in this area and like you say, it is an ideal frequency for Yagis.
My radios only cost £15 or so each brand new and boxed, the Yagi aerial was £20 so it's nice and cheap to play around with SRD-860. I'm hoping to get a handheld too, that band works well for GSM after all.

[bigbloke]

sad to say that the spacegun call tones are on the stock Alan 860 MHz radio !! (

been watching the SDR860 bands on an SDR fed from the IF of my AR5000+3

there's quite a bit of data activity in band "A" recently but rock all in the other bands.

needless to say my son and I are the "only voice users in the principality!! "

regards

BB

[wind in the antenna]

Location: Nominally Newport (South Wales) but potentially "anywhere
Well I hope you and your son don't ever make it to the South coast with your toy spaceguns

Band C and C2 are of most interest. My FTL-8011 radios do the usual FCC channels which extend up to channel 830 which is 868.98750 MHz. However, it is possible to hex edit a data file and get the radio to work up to 876.56250 Mhz which is the maximum extent of addressing within the software. I've reverse engineered the 16 bit word which makes up each channel. I've created a database which simulates the working frequency of these two octets. To give a brief explanation, the first octet produces a logical multiplier giving 25kHz steps. Bit 12 if asserted as 1 makes the channel simplex (Talk around) Bit 13 asserts a -12.5kHz offset (Band Offset) and then the last two bytes represent 12.8 and 6.4 MHz increments.

So that should be all very easy to take it out of band. The trouble is that the CE-11 software modifies (corrupts) certain values upon saving to file or writing to the radio. One of the problematic areas for me is band C / C2.

I'm wondering if this was due do an insistence by the FCC that walnuts should be cracked between the butt cheeks on the mobile phone frequencies.

[M3HIM]

sad to say that the spacegun call tones are on the stock Alan 860 MHz radio !! (

been watching the SDR860 bands on an SDR fed from the IF of my AR5000+3

there's quite a bit of data activity in band "A" recently but rock all in the other bands.

needless to say my son and I are the "only voice users in the principality!! "

regards

BB

Sorry to be pedantic but you got your "Short Range Device" and your "Software Defined Radio" a bit confused there! Oops!

We knew what you meant though.

I take it that when you say "watching the bands" you mean you have a wide-band waterfall display on the SDR monitoring the whole SRD channel range simultaneously for any activity. If so, that's a neat way to see what's going on with any band. I may have to invest in some similar kit.

Perhaps I'll go for a FUNcube Dongle 64MHz to 1,700MHz Software Defined Radio. Sadly this doesn't go below 60MHz yet so it's no good for Broadcast HF, CB Radio, Amateur HF and 6 metres (50MHz) but it looks good for the higher bands.

[wind in the antenna]

I'd be interested to know what sort of bandwidth you might expect from an I.F. output. It depends I guess if it's tapped off pre or post filtering.

My IC-R7000 has a 10.7 MHz I.F. output. I plug it into my IC-R20 sometimes to decode CTCSS and DCS tones and codes

http://www.youtube.com/watch?v=OhAM7JJG ... rofilepage

I'd really like to get and SDR sometime. If Crusty is reading this I'm sure he will be able to illuminate further.

[timb]

lift on,
mainly favouring North Eastern stuff but i have had a snifff of the newhaven relay on Channel 39

so i'm beaming at Brighton and monitoring 864.8875 because that was the freq in the picture
apologies for forgetting the agreed calling fq, i'm knackered

will leave the rx on overnight and record,

i'm actually monitoring slightly LF in usb mode so i'll hear anyone key up, and if its strong enough i'll switch to nfm

my location is Congleton, south east Cheshire