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Discussion in 'Station & Mobile Pics' started by 908, Jun 27, 2019.
stage gain and frequency response ...
"The 980 has built in mic pre-amp for gain and a noise cancelling microphone, thus unless your running it wide open and it still lacks gain the addition of cheap power mic will most likely add more distortion rather than voice range audio gain."
I never used an amplified mic on mine. People always thought I had some wonderful amplified mic. I didn't. Just adjust the internal mic gain and the radio will sound excellent with the stock mic.
Internal mic gain? I don't think many people know about this. Is it a pot on the board or in the menu?
Thanks for all the input guys. Guess I will leave the stock mic on it. If it ant broke don't fix it what I was always told. So what would be the best bet about my antenna situation?
Several options, use what you have and relocate it to either the center of the front bedrail or roof mount it.
Or install a 102" SS whip on the front bedrail, or roof mount a Wilson 1k\5k. Whatever works for you.
5. Operation buttons and associated LEDs:
MIC Gain: Adjusts microphone gain. Delivers up to 100%
modulation. With MIC Gain active, press and hold the PTT button and adjust the gain levels with the Channel Selector knob. (Levels 00 - 04). The LED will stay on for 5 seconds after you release the PTT button.
Gonna try like this first wish me luck
In the past, a lot of guys would mount a 102 inch whip on a 6 inch spring on the corner of a truck bed corner. The 102 inch whip is also called 'the quarter wave antenna'. This antenna also provides no gain; but does attain 'unity gain'. Nothing gained; but then again - nothing is lost - either. They don't work well while rolling, because it will whip around quite a bit and therefore doesn't provide a stable transmit pattern. But when parked on a hill, they are the king of it. At least, as far as tx and rx is concerned, and the best that a mobile system can do . . .
I had it set on level 3. It sounded excellent.
What is "unity gain" Robb
Thx in advance 73s
Unity gain (2.1 dBi) is a way of describing an antenna that outputs a signal at the same level at which it is input.
IOW, the antenna is putting out everything that the radio is giving it.
Any antenna shorter than a 1/4 wave length will not be as efficient and not distribute radio output power as well.
Any antenna longer than 1/4 wave length (like a 1/2 wave or 5/8 wave) will have more than unity gain resulting in more effective radiated power (or 'ERP').
I ran a 102" whip on a small, 2 door, Saturn. Made a trunk mount and it worked great and looked like a RC car, hahaha!
For an average 8 foot antenna mounted on an average vehicle, and using an estimated ground losses, the efficiency range maybe 80% on 10 meters.
There are a couple of things to remember when using this method. First, the analyzer's frequency must be adjusted until the reactive component is zero (X=Ø), and not for the lowest VSWR!
The radiation resistance is affected by the ground losses present.
A TRUE electrical 1/4 wave resonant antenna will have an impedance of aprox. 36 Ohms when X=0 !!!
That's not 1:1 VSWR...if truly tuned to max efficiency with analyzer most likely closer to 1.3 to 1:5 to 1.
Thusly a 1:1 VSWR may not be the Highest radiation efficiency for any given antenna.
Flame suit in hand
All the Best
Gonna have to get new stud the center came out when I slapped a tree gonna invest in a spring to this time.