Re: [RTrak] Re: RTrak-HAB antenna thoughts
- On 9/6/2012 2:55 PM, Jason R wrote:
The TX deviation and temp compensation are two completely different things. In this case, I am referring to the TX deviation slider in the RTrak/OpenTracker configuration software. Typically, when set here in the shop, the slider should be down towards the left end of the range and between the second and third hash marks. If you are up around the 30% mark, I can just about assure you that the deviation is off the charts and I'm surprised that anything was able to decode it.
UZ7HO's SoundModem is flat out amazing. It'll decode just about anything, but I'm not surprised that other stations, especially hardware-based ones, were turning a deaf ear.
If you have access to any hardware APRS TNCs or radios (Kenwood or Yaesu), it'd be interesting to put the balloon tracker next to them and the SoundModem setup and see what decodes it. Then crank that slider back down and see where they come back into decoding.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
- Ben KF7VZR (got that from a June 22 message) wrote...
> My documentation says nothing about TX audio level...Deviation is important. If it's too high (within limits) nearby stations
> They've both been played with...
may still be able to decode the tones. Distant ones where your signal
is weaker may not be able to. You have probably heard this on a voice
repeater or even on simplex. A distant and noisy station can be copied
via a repeater if he backs off from the mic. If he starts shouting, the
deviation goes up. More energy is outside the passband of the receiver
and eventually the signal is too noisy to copy or the squelch might
even close. If you are simplex, you can try opening your squelch. If
you are on a repeater, you're out of luck. It's the same with packet.
You are better off having the deviation set properly. It can be done
by ear, but a deviation meter or service monitor would be better.
Lacking one, just crank the deviation all of the way up and then
start turning it down. When it starts to sound quieter, turn it down
some more. It will get you in the ballpark, but checking the actual
deviation would be better.
Perhaps you could check the actual deviation before you change
anything. So... could over-deviation explain why only one iGate
73 es cul - Keith VE7GDH
"I may be lost, but I know exactly where I am!"