Topic: Is this legal R/C (Read 7120 times)

DickyD · « **on:** October 25, 2006, 09:23:28 am »

I have found in my loft a MacGregor R/C transmitter for 27 MHz and reciever I F Frequency 455 KHz. The crystals are 26.590 MHz.

Can anyone tell me if it is still legal to use this ?

Thanks.

Richard. :)

cbr900 · « **Reply #1 on:** October 25, 2006, 09:50:34 am »

Have you been sleep walking again Richard..

Roy

DickyD · « **Reply #2 on:** October 25, 2006, 10:28:48 am »

Not exactly but with no forum have been getting a bit desperate for something to do Roy ::) ::)

Richard

RickF · « **Reply #3 on:** October 25, 2006, 11:21:22 am »

What is the situation with regard to 27mHz? Is it to be banned, outlawed, or just discouraged?

Rick

DickyD · « **Reply #4 on:** October 25, 2006, 11:26:38 am »

No no that was my question !! ::)

Richard

Colin Bishop · « **Reply #5 on:** October 25, 2006, 11:56:37 am »

This was covered recently following the article in MMI. See Old 27meg radios in electronics. http://www.modelboatmayhem.co.uk/forum/index.php?topic=1630.0

Daryl · « **Reply #6 on:** October 25, 2006, 12:22:30 pm »

The article in MMI was a bit miss leading, best to check with UKRCC or the office of telecommunications who regulate and enfource the frequencies available .

Daryl

kikkari · « **Reply #7 on:** October 25, 2006, 12:32:03 pm »

Hi Richard,
~~No those old crystal don't appear to be legal,~~ Take a look at UK Radio Control Council 27Mhz. ~~It appears your 26.590Mhz crystals are now outside of the approved frequencies.~~ The blurb on that page gives some interesting info too.

I have a mate that sits on that committee and he predicted a few years ago that the manufacturers would go all out to produce synthesized RC gear; a few years on and not many synthesized radios available, my guess is that the manufactures will leapfrog synthesized and go to 2.4Ghz.

Ofcom have something to say on this too of course: Ofcom

edited by Kikkari: see AlexCs answer below....

RickF · « **Reply #8 on:** October 25, 2006, 02:28:36 pm »

Thanks guys.

So the official line, from Ofcom is

The UK RCC is keen to see 20 kHz and 30 kHz equipment not being used where and when it may have an adverse effect on the operation of other radio control models and would wish to see such equipment not used after 31 December 2006. In addition, the UKRCC strongly discourages the use of this band for the control of model aircraft because of this greater possibility of interference.

So, if I'm at Sheringham Yacht Pond next January, alone and forlorn, I can still use my CE-marked cheapo 27mHz kit.

Rick

Daryl · « **Reply #9 on:** October 25, 2006, 02:59:25 pm »

As I see it UKRCC only acts in an advisory capacity, they can't inforce anything. Ofcom however is the regulator and can inforce the current legislation.

Daryl

AlexC · « **Reply #10 on:** October 28, 2006, 11:37:02 am »

:)

Hi guys,

I am new to this forum, so bear with me while I get used to it.

In relation to DickyD's question.....was the crystal frequency he referred to the RECEIVER XTAL? if so then this would almost certainly be the receivers local oscillator frequency.
If you add to this the IF frequency of 455kHz you arrive at 27.045MHz which is the RED channel on the 27MHz band.

Macgregor had a habit of marking the receiver crystals in this fashion.
Check the markings on the Transmitter Crystal....this will be the true channel frequency.

Best regards.

Alex GM8ICC

kikkari · « **Reply #11 on:** October 28, 2006, 11:57:45 am »

What a great first post!

Doc · « **Reply #12 on:** October 28, 2006, 02:27:05 pm »

Oh no, another one of those 'hams'! What's this world comming to?
- 'Doc

Psst - Alex, 73. And welcome!

DickyD · « **Reply #13 on:** October 28, 2006, 03:42:53 pm »

Quote from: AlexC on October 28, 2006, 11:37:02 am

:)

Hi guys,

I am new to this forum, so bear with me while I get used to it.

In relation to DickyD's question.....was the crystal frequency he referred to the RECEIVER XTAL? if so then this would almost certainly be the receivers local oscillator frequency.
you add to this the IF frequency of 455kHz you arrive at 27.045MHz which is the RED channel on the 27MHz band.

Macgregor had a habit of marking the receiver crystals in this fashion.
Check the markings on the Transmitter Crystal....this will be the true channel frequency.

Regards.

Alex GM8ICC

Great answer AlexC

Didn't understand a word :-[

Transmitter crystal is marked 27.045MHz.

BUT IS IT LEGAL?? :-\ :-\

Richard

Peterm · « **Reply #14 on:** October 28, 2006, 04:02:16 pm »

Yes, for cars and boats. It is the red colour coded frequency on the legal 27 MHz band.

DickyD · « **Reply #15 on:** October 28, 2006, 04:26:08 pm »

Thank you Peterm

Understood every word. :)

Not having a go about AlexC's answer its just that I know absolutely nothing about electrics and yes or no answers are about all I can handle. :-[

Thanks all

Richard

barriew · « **Reply #16 on:** October 28, 2006, 06:10:57 pm »

"Yes, for cars and boats. It is the red colour coded frequency on the legal 27 MHz band."

And for aircraft if you're really desparate

Barrie

DickyD · « **Reply #17 on:** October 28, 2006, 10:09:54 pm »

I have enough trouble floating them without trying to fly them thanks ???

Richard

roycv · « **Reply #18 on:** November 13, 2006, 09:00:28 pm »

Hi all, not quite a reference to the title but the subject of synthesizing has come up!
I am going on a recent conversation with a 35 Mhz friend. There have been some user problems with synthesized equipment as when there are several lots of the gear in use the poor receiver just does not know who his mummy is!

When the 2nd. 3rd. etc. RC set gets switched on the Tx finds a vacant slot but the newly switched on rx. has a choice of ALL the Tx's switched on!

My friend said it was a case of getting away and in your car with doors shut and then turning on the rx for it to lock on to the correct Tx.

A solution of having a crystal in the tx. (this is cheaper) and a synthesized rx (also cheaper than a crystal one!) appears to be a working solution.

So if this is the system we are all waiting for............................count me out!

regards to all Roy

DickyD · « **Reply #19 on:** November 14, 2006, 08:48:16 am »

Doc · « **Reply #20 on:** November 14, 2006, 02:08:11 pm »

Roy,
Don't know about 'over there', but 'over here', the system has to look for a clear channel/frequency. That means that the TX and RCVR have to have a unique ID and only respond to that ID. Makes things a bit more complicated/expensive, but works nicely. 'Mistakes' do happen, but usually because 'things' aren't done 'right', which can also be a matter of design and not operator error.
- 'Doc

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Author Topic: Is this legal R/C (Read 7120 times)

Daryl

kikkari

Daryl

kikkari