i have a brand new dosy tfc 3001 and when i hook it up to my courier caravelle 2 it shows 27.2144 on channel 21 that is with a dead key when I talk the counter fluxuates all over the place also the modulation meter always pegs the needle when I talk into the microphone read directions and did it just like they said. The radio dead keys 4 watts so I think it is a virgin but not sure any help would be greatly appreciated
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frequency meter fluxuating
- Thread starter ron103067
- Start date
That reading you're getting is close enough for AM CB. Noone will notice that. An alignment might tighten it up a bit, or maybe not. Also, that meter might not be that accurate at that digit...hard to say for sure without seeing the specs. Either way, noone will notice it at all. Talk on it; have fun.
Consider, for measuring equipment such as this, the standard is to take the last displayed digit and make it + or - 1. Also, this counter probably uses a circuit design and components similar to those in most CB radios, so it's stability is going to fluctuate as much as 3 on that last digit.
So, now your reading can vary from the actual frequency of the radio by as much as 4 units on that last digit, which is in 100s of Hz.
Assuming the calibration of the counter is dead on, your reading is 600 Hz low, but your actual frequency could be only 200 Hz low, which is again within the design specification of this class of radio. Of course, it could also be off as much in the opposite direction.
Try the measurement again in the summer and see how much it changes.
The relative magnetic flux of the earth relative to the sun, the lunar alignment of the planets, temperature and humility all affect these measurements.
So, now your reading can vary from the actual frequency of the radio by as much as 4 units on that last digit, which is in 100s of Hz.
Assuming the calibration of the counter is dead on, your reading is 600 Hz low, but your actual frequency could be only 200 Hz low, which is again within the design specification of this class of radio. Of course, it could also be off as much in the opposite direction.
Try the measurement again in the summer and see how much it changes.
The relative magnetic flux of the earth relative to the sun, the lunar alignment of the planets, temperature and humility all affect these measurements.
What is the "it"? The frequency meter? The radio?
Unless one of them has been recently calibrated (and not just "checked"), you can't be sure either one is dead on.
As C2 implied, each piece of equipment has a possible error built in, determined by the manufacturer. As an example, when Bird says their Model 43 wattmeter is accurate to within plus or minus 5%, that's the maximum error you can expect from that meter. Calibrating the meter will restore the error to within this +/- 5% range; it will not make it "perfect".
After reading the replies the meter is only 1 number off on the last digit of the counter it shows 4 when it should be 5 so with plus or minus 1 it is right on.
Yeah, but not that much.
If it was really way off freq - someone would be telling you.
BTW - if you have a SSB radio, you can always adjust it a few cents over. And if the clarifier is unlocked, you can easily slide it over on freq with your freq counter.
If it was really way off freq - someone would be telling you.
BTW - if you have a SSB radio, you can always adjust it a few cents over. And if the clarifier is unlocked, you can easily slide it over on freq with your freq counter.
Not necessarily. The radio could be right on, but the COUNTER could be off a bit.
Well the radio it read that number on was an old courier caravelle 2 but on my uniden grant xl it reads 27.2149 and 27.2150 it goes back and forth so that was why I think the radio is off freq. cause my grant gets great reports all the time