Sinclairbear 1:43am, 10 December 2012
Hi guys, im new to the strobist scene and just bought my new set of 602 triggers. I tried searching for this but had no luck. On the underside of the transmitter there are 4 small switches. Are these used to trigger separate groups or adjust another parameter with these triggers?
Thanks
They are for different channels, but they must all be the same channel as the transmitter...This way if you have 4 phtoographers all using the RF-602 you change channels so no interference and misfires
strobelight1 5 years ago
I wonder if later models like the newer YN622 use different frequencies
thorsten198 Posted 5 years ago. Edited by thorsten198 (member) 5 years ago
To tell you the truth, I 've never touched the switches on mine, but I also have no idea how to operate this.
How are these switches used, there is a plastic cover above, do you press it with a ball pen or what else?
-nickon- PRO 5 years ago
Remove the orange platic cover and toss it.
FlashJournal Posted 5 years ago. Edited by FlashJournal (member) 5 years ago
The 602's come with an user manual. There is a small diagram explaining the position of the switches. I think that you only need to change channels when other strobists (using 602's) are around.
Edit: what CarassiusProductions.com.au said
thorsten198 5 years ago
@nikkon

Thanks, that's what I didn't realized, removable plastic foil - life can be so easy sometimes :-)
Mr. Speedlight 5 years ago
I wonder if later models like the newer YN622 use different frequencies

I would think they are different frequencies with in the same band for all trigger brands. Different frequencies for different channels. Different digital codes for different groups if available.

Dave Hartman
Mr. Speedlight 5 years ago
I 've never touched the switches on mine, but I also have no idea how to operate this.

Have you got a remote control for your garage door? I don't own a 602 but I'm sure the switches are for the same purpose.

How about a cordless phone. You can change channels if there is interference and phone normally select the cleanest channel.

I wondered if I'd have problems with interference with my Phottix Strato II(s) and my computer gateway, I haven't. I'm pretty sure they are on different channels. I wondered if I'd have problems if the transmitter was too close to the receivers. I haven't seen that.

The only problem I had was my SB-700 didn't always wake properly from standby. It sometimes freezes. It does that when wired to an SB-800 also so I blame the SB-700. Once I turned off standby it never freezes. I can't use standby with my wiring for two SB(s) on one receiver anyway so I've turned of standby on all. If I had all SB-800(s) and an Rx for each I'd use standby.

With my Strato II(s) I use channel 1 for flash and channel 4 for shutter release. I use the same Tx for flash reading and then switch channels for shutter release.

Anyway I'm quite sure these Tx/Rx sets use different frequencies in the same band and call them as other devices do, channels.

Dave Hartman
mjkzz (a.k.a zwdeal) 5 years ago
Mr. Speedlight:

There are many different technologes used in radio remote domain and it is kind of complicated. But normally, the old PT-04 type of triggers use a fixed frequency but keying signals with amplitude (ASK) similar to AM radio.

Another technique is frequency shift keying (FSK, and its variant Gaussian FSK) where a center frequency is defined and signal is modulated by shifting transmission frequency from the center, multiple center frequency can be defined for the same band. such as 915M (cordless phones) or 2.4G (wifi, bluetooth, zigbee, and our 2.4G triggers). This is similar to FM radio.

So for ASK based radio trigger, basically you have one fixed frequency and channel realization is achieved by transmitting diferent code, most likely defined by those DIP switches you see.

With FSK techniques, you can do both -- different center frequencies (withing same band) or transmit different code because these radio devices is really fast (1-2MBPS).

For example, I have one 2.4G radio module that can have 16 channels and center frequency for channel 0 is 2.4G, 2.402G for channel 1, etc

It is true that some ASK radio trigger has minimum range, as I believe @Rudy__ was saying. There are many reasons for this, but one is receivers' auto gain circuitry -- when the receiver has not received any valid signals, it cranks up gain, but suddenly it receives a strong signal, distortion will happen.

Just 2c
DavidJ Stanley PRO Posted 5 years ago. Edited by DavidJ Stanley (member) 5 years ago
Dip switchs no problem used on lots of things

switch channel

1= 1
2= 2
2+1= 3
3= 4
3+1= 5
3+2= 6
3+2+1= 7
4= 8
4+1= 9
4+2= 10
4+1+2= 11
4+3= 12
4+3+1= 13
4+3+2= 14
4+3+2+1= 15
CHANNEL 15 - might control all channels You would have to check?
MrDAT 5 years ago
I think of it like binary. :)

0000 = 0
0001 = 1
0010 = 2
0011 = 3
...
1100 = 12
1101 = 13
1110 = 14
1111 = 15
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