I recently discovered a deaf frequency on the 996 and I am not sure if anyone else has run across this. I put the frequency of a local low power repeater in the radio but I was not hearing anything. When I put this same frequency into my PRO-96, PRO-2005, PRO-96, FT-847 and TM-D700 it was working fine. Only the 996 was deaf! A friend with a lot of radio knowledge and radio test equipment did some testing on the 996 as well as a few other radios.
We tested the radios by ear as well as with a voltmeter. We did not have cables for a few of the radios so we could only test to the point where we did not get any "crackles". The first two columns are self explainitory. The "No Crackles" column is measured by listening to the speaker and increasing the signal until the crackles stop. The 20dB quieting is MEASURED with a voltmeter for 20dB change. We used an 1/8" jack so if the radio did not have an 1/8" jack, we only checked by ear. We also stopped checking both ways on the 996 after several readings because our "by the ear" method was pretty close to what we were getting using the voltmeter. The last two columns are specifications that are indicated in the manual, some list 20db, others SINAD.
As you can see, the radio is DEAF on 464.625! If anyone else has the ability to check their 996, it would be interesing to see if it is only my radio or if that is a birdie or some other deaf point.
Equipment used:
Signal Generator: Agilent E4430B 1 GHz
AC Voltmeter: Fluke 189 True-RMS DMM
We tested the radios by ear as well as with a voltmeter. We did not have cables for a few of the radios so we could only test to the point where we did not get any "crackles". The first two columns are self explainitory. The "No Crackles" column is measured by listening to the speaker and increasing the signal until the crackles stop. The 20dB quieting is MEASURED with a voltmeter for 20dB change. We used an 1/8" jack so if the radio did not have an 1/8" jack, we only checked by ear. We also stopped checking both ways on the 996 after several readings because our "by the ear" method was pretty close to what we were getting using the voltmeter. The last two columns are specifications that are indicated in the manual, some list 20db, others SINAD.
As you can see, the radio is DEAF on 464.625! If anyone else has the ability to check their 996, it would be interesing to see if it is only my radio or if that is a birdie or some other deaf point.
Equipment used:
Signal Generator: Agilent E4430B 1 GHz
AC Voltmeter: Fluke 189 True-RMS DMM
