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[dpbarry]

Hi all..

Does anyone have a frequency chart for 40MHz.

I'm trying to match up frequencies against channel numbers in the 40MHz range .

I'm a little confused with a frequency chart at:

http://www.rctek.com/radio/rc_model_car_radio_frequencies_uk.html

It appears that in my collection I have what appears to be a futaba set and what I would describe as a non-futaba set of crystals. I'm using them in a Robbe/Fubata FC-16 TX

On one set I have the TX and RX are marked as 56 - (40.735) and another set I have which is packaged in a Futaba bag as 40.895 which according to the above website is channel 89

What confuses me more and maybe I'm reading too much into thiss is that on the Non-Futaba bagged TX and RX crystal it is marked Type 40 - 6 whereas on the Futaba Bagged RX Crystal, it is marked 40 - 6 but on the TX it is marked 40 - 12

Can anyone shed light on all of this. Do I need to worry about the 40-6 or 40-12.

I have a single conversion receiver which needs a single conversion crystal so am trying to match it to the TX crystals I have but parts of the above confuse me.

Declan

[maninthestreet]

 Not sure if this helps:

http://www.ukrcc.org/40mhz.html

[dpbarry]

Hi Maninthestreet..

Thanks for the link.  In an indirect way, it has confused me even more (or I'm mentally challenged  ::))


For instance, working on just the frequencies as stated, my unopened pack of futaba crystals are noted as 40.895 which also says on the package channel 89.

Looking at the link you gave me, it gives channel 89 as 40.935 not 40.895.

My channel 56 crystals seem okay as they match on this site.

Still non the wiser on what the 40-6 and 40-12 means

Can anyone further enlighten me 

Declan

[barriew]

Declan- don't worry too much about the channel numbers. I think they are more often used on the continent. If the Frequency is given that is what is important and what you should show on your frequency penant.

As far as I know the 40-6 and 40-12 indicate Rx and Tx in Futaba spreak. If you have two of either type for the same frequency I think you will have problems!

Barrie

[dougal99]

UK and Continental channel numbers are different ??? ??? ??? UK channel numbers take the first two numbers of the frequency eg 40.695 = channel 69 but thisw is continental channel 53!! Confused so am I. Some UK channels have no continental equivelant. 40.745 and 40.755 are not in the Continental list and are between Continental channels 56 and 57 (40.735 and 40.765 respectively).

Moral - stick with the frequency.

Cheers

Doug

PS I carry a equivelants chart in my toolbox. Sad eh?

[dpbarry]

Cheers folks..

I'll do as said and stick with the actual frequency and work the channel numbers out at a  later stage.  I come from a Aircraft backround thus wouldn't want to get the frequency wrong and pile someone aircraft into the black bag so you can see where I was coming from on getting the channels and frequencies matched.

Declan

[aston]

you will most likely find at any UK boating event that people sailing SHOULD be flying a pennant with the last three digits of the frequency in use, (ie 685 for 40.685) usualy white numbers on a green background.  I have never been to an event in this country where the "continental" numbers were used.

One other piece of advice I would give is that I regularly notice crystals for sale on ebay that have a number ending in zero.  These are illegal for UK use as all approved frequencies end in 5.  Modern radio gear is tuned to work on 10kHz spacing, so 40.685 and 40.695 ( 10k apart) should work ok next to each other.  If you introduce 40.690 you are heading for trouble, so my advice is if you are offered any crystals with a frequency ending in zero, "just say no !"

Aston

[dpbarry]

Cheers Aston.

I'll be sticking with a model company for this sort of stuff. At least then there is a bit of comback if things don't work out correctly.

Declan

[dannymax]

you shouldnt need to worry as long as your club is using a peg board... what you may need to worry about is that people are actually using the peg board properly  ??? I have often seen people walk up to the pegboard and check that the frequency is available then walk away and start sailing without actually taking the peg... :-[

[Peterm]

Hi, just to add to the confusion, if you are using a single conversion receiver, the Rx xtal should have RA on it, if using a dual conversion receiver, use a Rx xtal marked with RF.   I agree, do not bother about channel numbers.   pete M

[funtimefrankie]

, if you are using a single conversion receiver, the Rx xtal should have RA on it, if using a dual conversion receiver,

What does single and dual converstion mean >:(
thanks
Frank

[Red_Hamish]

Hello all, a little bit of a search through our clubs' web page brought me to this little helpful pdf files

you may find that the fisrt link is all you'll ever need to know about 40Mhz

http://www.edinburghmodelboatclub.org/index1.htm

and like wise for 27Mhz

http://www.edinburghmodelboatclub.org/helppages/27megcrystalcolours.pdf

cheers

Jim

[Peterm]

Frank,  Reference single and dual conversion receivers.   If you do a forum search for `Cheap 27 MHz crystals` Reply no.11, dated July 31, I tried to explain the subject.   Hope it helps,  Pete M

[Tug-Kenny RIP]

Having been to my first meeting at the 'Mayhem Bash' I was instructed in the use of the 'Peg Board'.


It occurred to me that perhaps we should have an  R/C frequency list for members just like the Edinburgh club have.  please see below.

                           http://www.edinburghmodelboatclub.org/index1.htm

1.  Click on  Help pages
2.  Click on R/c Channel usage

My thanks to the Edinburgh club for the information and Idea.


I found myself changing the crystals between my two boats, as one of the frequencies was being used by someone else.

I'm sure that not all the 33 frequencies will be in use at any one time, and it would be helpful to know what other members used.

What do you think ?


Ken