At 3/14/2007 19:23, you wrote: >Nate, > >Several years ago, I chastised ARRL Labs for failing to report the basic >2-way radio performance parameters of 12dB SINAD sensitivity, voice >deviation limit, CTCSS deviation limit, and center frequency accuracy. I >did not get a satisfactory answer, but I suspect that there is a reluctance >to disparage the performance of name-brand Ham radios. > >Nearly every Amateur 2m radio I have tested has CTCSS deviation far in >excess of the EIA/TIA recommended level of 750 Hz, and that level is not >adjustable in most radios.
My experience is totally contradictory to your conclusions > Alinco radios are the worst in this regard, >because the radios are made with fixed resistors that set the CTCSS >deviation level, which usually is two to three times the proper level. Again, I disagree completely. My DJ-G5T HTs all have adjustable CTCSS levels. When I bought them the CTCSS level was a bit high (900-1000 Hz). I suspect they do this in an attempt to compensate for the lack of high-pass audio filtering in the mic amp circuitry, which causes CTCSS talk-off. After turning the CTCSS deviation down to 700 Hz, I've had no problems with talk-off. Still, this along with poor CTCSS decode performance are IMO some of the biggest problems with amateur gear. Bob NO6B
