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[warspite]

I have a sksport 6 - bought to run a fleet of plastic fantastics, using a specific number on the 40mhz freq. The rx crystals in the ships would not be removable once sealed within, so for the next vessel to come under the same build requires a rx crystal, so I am starting to look for the rx crystals for 40.695 - any good places to look?
 
So to test the boats servo's, I also have a pair that are tx 40.745 and rx 40.290 and a business card that says Tx No's are 0.455 higher than Rx - which sort of runs true, I say that because I placed each in their respective devices to test the servo's (resetting the servo's for zero points for fitting in the vessel) and chatter, boy was there chatter, one servo a hitec, acted like it was auditioning for the exocist, 90° more like 180°, I thought they had stops!.
 
Anyway, whilst trying to determine what channel on the transmitter related to the HFS-05 receiver, not a lot of positive operation, there was a lost of stepping left and right, the odd occassion it operated as it should, whilst trying different servo's gave mixed results, some would work, others just chattered. I am trying to have the tx and rx operate the servo's correctly - I assume that if I get a set of rx 40.695 and use the one that I know worked, then I might get a usuable boat, after visiting a model shop whose owner said that all the model car owners are trying to get theirs up and running because of the good weather, and boaters are more and more using the 2.4Ghz band.
 
Does anyone have any recomendations - it may be that being in the loft and the equipment being very close together, then the chatter is a symptom of that. 

[barriew]

40.695 is probably the most common frequency as nearly all basic sets come (came) with that frequency. I would think Howes Models was as good a place as any to source them.


Barrie

[warspite]

after a bit of checking the usual suspect sites , channel 53 - available in both either a pair (tx / rx) or as singles, so I will have to get a couple, though is the .455 difference the reason it partially works and i need a rx 40.695 to match the tx so as to stop the chatter?
 
I am trying to use up the kit I have rather than spend on all brand new

[malcolmfrary]

though is the .455 difference the reason it partially works and i need a rx 40.695 to match the tx so as to stop the chatter?

The 455KHz difference is the reason why it works in the first place.  It is the frequency that the IF stages in the RX run at, and maintaining the precise difference is vital.  (google for the wiki on "superhet" radios for either enlightenment, confusion, or an early nights sleep)  If you can only get crystals in pairs, you will have a lot of spare TX crystals going, but since, as has been mentioned, they seem to be the "standard" issue, you are almost certain to run into frequency clashes.  It might be the case that fellow club members have bought crystals away from 695 to avoid this problem, so they might be a source of spares.
A bit after the event, but could the job have been done with 2.4 and multiple RXs?

Servo chatter has many causes - faulty servo, no valid signal from the RX (and the tree of causes for that) a poor power connection and interference.  Servos do have stops - at 270°.

[warspite]

This is the first time the sets been used in four years, so need to try it on another boat to see if chatter appears on the .695 channel, the set was about 3" from the rx so no trees in the way , unless you count the plank that was operating it.  , i dont know much about frequencies and the black arts, just want to connect these bits together and have a sail, though this is an intergral part of the system, will try a few experiments and try again.