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Radio Channels
Shoreline Model Yacht Club

The following lists surface channels being used by club members.

This list is to serve as a handy reference for anyone getting a new radio or spare set of crystals. We believe that by using this list we can avoid having any radio channel duplications here in our club. However, for the instances where some of us might visit another club, or have visitors at our site, it is probably a good idea to have an extra set of crystals.

Club members be sure to notify Gary Watson if there are any changes or additions to be made to this list.

A new technology came out a few years ago that will eliminate the need for a list of frequencies. DSM is now available for most radios. With DSM, your transmitter scans the area for available frequencies and chooses an open channel for you.
Excerpt from website:

"What is DSM?

DSM is Digital Spectrum Modulation - a purely digital RF link between transmitter and model that is based on Direct Sequencing Spread Spectrum technology. It operates within the ultra-high 2.4GHz worldwide ISM band, provides unequaled signal resolution, and is immune to the most common forms of RF interference. It will even allow your model to “talk” back to you. It requires no crystals and completely frees you from ever having to monitor frequency usage again. Best of all, with Spektrum’s DSM System you can literally plug this phenomenal technology into existing transmitters like the JR R-1 and Airtronics M-8."

Check out the Spektrum Website for more information.

2.4 GHz 27 MHz 75 MHz 75 MHz 75 MHz
CH Freq CH Freq CH Freq CH Freq CH Freq
All 2.465 A1 26.995 61 75.410 71 75.610 81 75.810
A2 27.045 62 75.430 72 75.630 82 75.830
A3 27.095 63 75.450 73 75.650 83 75.850
A4 27.145 64 75.470 74 75.670 84 75.870
A5 27.195 65 75.490 75 75.690 85 75.890
A6 27.255 66 75.510 76 75.710 86 75.910
67 75.530 77 75.730 87 75.930
68 75.550 78 75.750 88 75.950
69 75.570 79 75.770 89 75.970
70 75.590 80 75.790 90 75.990

pict0047.jpg

Skipper   CH Skipper   CH
open 61 Philip 76
open 62 open 77
*conflict (86)  63 Steve 78
Pip 64 open 79
open 65 open 80
open 66 open 81
open 67 Bouy Boat 82
Sean 68 open 83
open 69 open 84
open 70 open 85
open 71 Gary 86
Steve 72 *conflict (64) 87
open 73 open 88
Cliff 74 open 89
open 75 open 90
open A1 open A4
open A2 open A5
open A3 used by CB-23 A6
Bill DSM John DSM


23-Channel Conundrum*

by Chuck Winder

     Readers of the CR 914 NEWS will know about the potential of 2IM radio interference that is called 23-channel syndrome. The puzzle has been: Why doesn’t it happen more often?:
    1. A single group of Txs standing together and having 23 channel separations will not cause 2IM interference in their boats. This explains Hitec’s Tony Ohm’s observation that it is not a problem in model car racing. In car racing, drivers stand together.
    2. However, if a skipper standing a distance from the above group sails close to the group of Txs, he will probably experience 2IM interference.
     The reason there is no problem in #1 is that the 2IM signal at 460 KHz is much weaker than the Tx primary signal. But if in #2 the signal received at the boat is sufficiently weakened by the distance of the Tx from the boat, the 460 KHz signal generated by the grouped Txs can be large enough to cause lack of control.
      At some sailing venues (like at Shoreline), skippers walk along the pond to be close to their boats. In this case, if boats are widely separated, the conditions in #2 can occur and interference will be experienced. At the Cow Pond Regatta (4/10/2004), there were three 23-channel combinations for the 19 boats! No loss of boat control was reported. At this regatta the skippers all stood the same distance from their boats. Though it surprised me at the time, #1 above tells why there shouldn’t have been interference.

Tentative Conclusions

    1. At a regatta where skippers stand close together, there should not be 23-channel interference. Regatta management can consider permitting 23-channel separations.
    2. At a place such as Shoreline Lake, the conditions for 23-channel interference can be occur since boats and skippers can be spread out over a long distance.
    3. If at any regatta the skippers are restricted to remain within a small control area, then 23-channel interference should not be a problem.

* The above discussion is derived from information from Dave
Collings, D & M Electronics and appeared in The CR914 News , Issue 41 pg. 10