Old Sanwa receiver

[Espen Johannessen]

Hi!

I came in a slightly complicated situation when I had to fix an old RC car
recently. The old setup consists of old Sanwa servos and receiver. One servo
(and now also the other) broke and I replaced it with a new Futaba. To get
this to work in the system I had to switch the positive and negative cables.
I realized this after some trial and error, and I guess I might have
affected something in the receiver during this.

Now the receiver mirrors the directions of the servo's turnings. When I pull
the steering stick to the left the wheels turn right, and when I press the
power stick forward the car backs and vice versa! Do you know how to change
the directions or "polarity" of the receiver?

Another quesition; do you know if a new receiver will work with my old
remote control and the crystal?

--
Espen

[Ron Olson]

"Espen Johannessen" <reply@togroup.com> wrote in message news:<4197b859@newsflash.abo.fi>...
> Hi!
>
> I came in a slightly complicated situation when I had to fix an old RC car
> recently. The old setup consists of old Sanwa servos and receiver. One servo
> (and now also the other) broke and I replaced it with a new Futaba. To get
> this to work in the system I had to switch the positive and negative cables.
> I realized this after some trial and error, and I guess I might have
> affected something in the receiver during this.
>
> Now the receiver mirrors the directions of the servo's turnings. When I pull
> the steering stick to the left the wheels turn right, and when I press the
> power stick forward the car backs and vice versa! Do you know how to change
> the directions or "polarity" of the receiver?
>
> Another quesition; do you know if a new receiver will work with my old
> remote control and the crystal?
Sanwa is now known as Airtronics, it was Sanwa then Cox/Sanwa before
becoming Airtronics. If it is an old unit, it may not be compatable
with the new narrow-band systems. This is why you are having
compatability problems using Futaba gear along with one system using
positive shift anf the other a negative shift radio system.

[Jim Gill]

On 30 Nov 2004 07:17:32 -0800, owetpaint@aol.com (Ron Olson) wrote:

>"Espen Johannessen" <reply@togroup.com> wrote in message news:<4197b859@newsflash.abo.fi>...
>> Hi!
>>
>> I came in a slightly complicated situation when I had to fix an old RC car
>> recently. The old setup consists of old Sanwa servos and receiver. One servo
>> (and now also the other) broke and I replaced it with a new Futaba. To get
>> this to work in the system I had to switch the positive and negative cables.
>> I realized this after some trial and error, and I guess I might have
>> affected something in the receiver during this.
>>
>> Now the receiver mirrors the directions of the servo's turnings. When I pull
>> the steering stick to the left the wheels turn right, and when I press the
>> power stick forward the car backs and vice versa! Do you know how to change
>> the directions or "polarity" of the receiver?
>>
>> Another quesition; do you know if a new receiver will work with my old
>> remote control and the crystal?
>Sanwa is now known as Airtronics, it was Sanwa then Cox/Sanwa before
>becoming Airtronics. If it is an old unit, it may not be compatable
>with the new narrow-band systems. This is why you are having
>compatability problems using Futaba gear along with one system using
>positive shift anf the other a negative shift radio system.

This has nothing to do with the receiver. Simply that the Sanwa and
Futaba servos rotate in different directions for the same stick
movement. If the transmitter has servo reverse switches then use them
to change the servos direction. If it doesn't have servo reversing you
have a bit more of a problem. Try moving the horn on the servo through
180 degrees if possible. If this is not possible then try to get some
servos with opposite rotation. You might be able to get hold of some
older sanwa servos as replacements.

Jim Gill
Dundee Model Boat Club
http://www.modelboating.co.uk