Need help with Acoms Receiver

[Jim the wookie]

Hey everybody hoping there is an Acoms radio gear guru out there who can help me.

In a recent ebay win of a holiday buggy i recived a period acoms radio set as a bonus, Sweet! However at some point the reciver ariel has been butchered and it's about an inch and a half long. I would like to rectify this and bring it back up to standard for fitting back into the holiday bug but i don't know how long the acoms reciever ariels were for that model (ARC227) as all my classic gear is futaba. So if some one could help me out with an ariel length measurement i'd much appreciate it.

Thanks in advance

Jim the Wookie

[KEV THE REV]

Hi Jim, i have an unmodified ARB 227 receiver in my Lancia Rally original model from the '80's and the ariel wire is 3 feet long (900mm). I know your receiver is an ARC , but this might help in some way []  cheers ,Kev

[KEV THE REV]

Just checked an ARC227 in one of my old buggies , but that has an ariel wire of about 18 inches (450mm) ,and it looks to be cut down , but i cant be sure - sorry i cant be of much help ,but at least you know it should be 18" or more  []  cheers ,Kev

[DJTheo]

http://www.tamiyaclub.com/tools.asp

Cheers 

[Jim the wookie]

Now thats cool! thats to the both of you, great calculator DJ.

Cheers

Jim the wookie

[Wrc action]

Thats pretty neat DJTheo. Now I wont cut my 40Mhz receivers cable down to size lol. btw whats the formula behind it? or is that secret lol []

cheers Ryck  

[DJTheo]

The formula is very simple, a straight wire aerial should be full multiples or divisions of the wavelength of the frequency and wavelength λ (in metres) equals 3×10⁸ m/s divided by frequency ν (in hertz).

Cheers 

[Wrc action]

Ahhh i remember that slightly from my GCSE physics last year. So no stock reciever is the perfect length of wire lol- they are a compromise between all the bands. Tho that would mean that a 27mhz frequency could run in a 40mhz receiver just the wire would be out. Unless there is different current/volts. tho current would be very low in milli or micro to keep circults so small so i dnt see to much of a problem there. Best Regards Ryck

[DJTheo]

Tho that would mean that a 27mhz frequency could run in a 40mhz receiver just the wire would be out.

Nope, also the whole receiver electronics are tuned for a specific frequency band and the more far the frequency is, the worse reception will be.

Cheers