Commercial radios also used fixed values. The Micor is one example of fixed values for tone deviation.
Chuck WB2EDV ----- Original Message ----- From: "Mike Morris WA6ILQ" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, March 14, 2007 11:37 PM Subject: Re: [Repeater-Builder] Amateur-Grade Radios (Was: Fixed Audio) > At 07:23 PM 03/14/07, Eric Lemmon WB6FLY 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. > > QST survives on the ads. The league doesn't want to risk the revenue. > As the wise man said, he who has the gold makes the rules. > >>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. > > Pots cost more than fixed resistors and that would reduce the profits. > >>
