Two grays are technically not compatible as they use the same signal frequency. I did it for a year and never personally had an issue, but it is a known problem which is why they added the yellow transmitter.
Transmitter dropout when using Perdix in sidemount
- Thread starter Erik Forsberg
- Start date
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Paul M
Contributor
I have about 100 SM dives using dual transmitters (grey/yellow) with my Perdix.
I have noticed a small number of times it has briefly dropped signal. It's always been in cold water, below 10C.
I have noticed a small number of times it has briefly dropped signal. It's always been in cold water, below 10C.
@Erik Forsberg
I was diving today in 49F water so that’s just below 10C. Left (yellow) transmitter did lose the connection for a wee bit. Nothing really different that I was doing. It was a 40 minute dive in a former lead/zinc mine.
I was diving today in 49F water so that’s just below 10C. Left (yellow) transmitter did lose the connection for a wee bit. Nothing really different that I was doing. It was a 40 minute dive in a former lead/zinc mine.
Jens Bölte
Contributor
Hello
The transmitters are supposed to work from -6° C - +60° C (22° - 144° F). So it is probably not a temperature issue assuming full batteries.
It might be an interference problem given that you are using two gray transmitters. A friend of mine uses the same setup and has transmission problems from time to time (no transmission from one transmitter). I use a gray and a yellow one. There is rarely a connection loss longer than a couple of seconds.
A transmitters is turned off when the pressure is below 50 bar over a period of 2 minutes. So, you might „restart“ a transmitter by closing the tank, purging it down and opening it after 2 minutes.
Do you have the option to test-dive a yellow and a gray transmitter or the new Swift-transmitters? If there are no dropouts in this situation, it is most likely an interference problem.
Best wishes Jens
The transmitters are supposed to work from -6° C - +60° C (22° - 144° F). So it is probably not a temperature issue assuming full batteries.
It might be an interference problem given that you are using two gray transmitters. A friend of mine uses the same setup and has transmission problems from time to time (no transmission from one transmitter). I use a gray and a yellow one. There is rarely a connection loss longer than a couple of seconds.
A transmitters is turned off when the pressure is below 50 bar over a period of 2 minutes. So, you might „restart“ a transmitter by closing the tank, purging it down and opening it after 2 minutes.
Do you have the option to test-dive a yellow and a gray transmitter or the new Swift-transmitters? If there are no dropouts in this situation, it is most likely an interference problem.
Best wishes Jens
InWay2Deep
Contributor
I've not noticed this issue with the Swift transmitters on a 6" hose (dry suit/heavy undergarment/sidemount) and I use a Perdix AI on each arm, once I had one computer not connect to either transmitter but a quick on/off at the surface and no issues since.
Are you using the swift transmitters or the older ones?
InWay2Deep
Contributor
The battery status (3V, 2.75V, or 2.5V) is transmitted every 5 seconds. If it is a low battery problem, then the battery warning should show on the computer.
The only way 2 greys (or 2 greens or 2 yellows) can interfere with each other is if they are turned on at nearly the same time; then a little clock drift might slide the transmission of one enough to interfere with the other. If they are turned on 2.5 secs apart, the drift is not enough to cause interference.
It sounds like signal attenuation by the location of the transmitters, in which case moving the srist that has the computer on it over closer to the not-heard transmitter -- for at least 5 seconds to mkae a sure a transmission happens -- should regain reception.
The only way 2 greys (or 2 greens or 2 yellows) can interfere with each other is if they are turned on at nearly the same time; then a little clock drift might slide the transmission of one enough to interfere with the other. If they are turned on 2.5 secs apart, the drift is not enough to cause interference.
It sounds like signal attenuation by the location of the transmitters, in which case moving the srist that has the computer on it over closer to the not-heard transmitter -- for at least 5 seconds to mkae a sure a transmission happens -- should regain reception.
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