... ohhh, what can i say, besides DONT TRUST EBAY!
I bought a "works great" 148 gtl and it turns out it doesnt work so great.
To begin with, when I hooked it up mobile the rx audio would be low until I gave the car some gas. Ive had 2 other mobile units that work fine, so I knew it wasnt the car. So I brought the unit inside and hooked it up to my variable power supply and it seemed to work ok, with the exception that the channels under 11 or so didnt rx unless I lowered the voltage down to about 9v. The more I lowered the voltage, the more channels under 11 would come back. So i figured the voltage regulator was bad. I checked the PLL and it was hot to the touch and it was running 13 some odd volts at all the pins that were suppose to be 8v. I also checked pin 1 on the voltage regulator and it too was running at 13 volts instead of 8. Also SSB (LSB and USB, didnt matter) would squiel when I turned up the dynamike or the volume or both. I ordered a new voltage regulator and while i was waiting for it the radio really went south.
I was testing the SWR (which actually read 1:1.5 or so, nothing that should have damaged the radio) of an antenna and all of the sudden I wasnt hearing anyone on any of the channels. I also noticed that R113 had burnt and R77 had a singe mark on it. also, there would be a pulsing sound on chan 13.
I got the new Voltage regulator and installed it and here is where I stand now:
Radio seems to be stable voltage wise (8v measured at pin one of the Voltage Regulator and PLL) but now it seems the PLL maybe dead.
I also added a frequency counter to make sure i was on the right freqs.
Now when I xmit (got a good 1/2 wave inverted V dipole that i tested with another radio) the FC reads either one of two issues:
sometimes the radio will sound normal (normal radio static) on channels 1 through 29, and the FC will read around 27.7 through 28.5ish depending on the channel. 30 through 40 are really quiet. If i tap pin 8 on the PLL with my finger, all the channels will go really quiet and when I check the freq, all channels report back at 27.5 or so. If I tap pin 7 it will go back to channels 1 through 29 working.
Sounds to me like the PLL is malfunctioning, but i wanted to get some input from others on the forum before i shelled out the cash for a new one.
Any help would be greatly appriciated.
Thanks
I bought a "works great" 148 gtl and it turns out it doesnt work so great.
To begin with, when I hooked it up mobile the rx audio would be low until I gave the car some gas. Ive had 2 other mobile units that work fine, so I knew it wasnt the car. So I brought the unit inside and hooked it up to my variable power supply and it seemed to work ok, with the exception that the channels under 11 or so didnt rx unless I lowered the voltage down to about 9v. The more I lowered the voltage, the more channels under 11 would come back. So i figured the voltage regulator was bad. I checked the PLL and it was hot to the touch and it was running 13 some odd volts at all the pins that were suppose to be 8v. I also checked pin 1 on the voltage regulator and it too was running at 13 volts instead of 8. Also SSB (LSB and USB, didnt matter) would squiel when I turned up the dynamike or the volume or both. I ordered a new voltage regulator and while i was waiting for it the radio really went south.
I was testing the SWR (which actually read 1:1.5 or so, nothing that should have damaged the radio) of an antenna and all of the sudden I wasnt hearing anyone on any of the channels. I also noticed that R113 had burnt and R77 had a singe mark on it. also, there would be a pulsing sound on chan 13.
I got the new Voltage regulator and installed it and here is where I stand now:
Radio seems to be stable voltage wise (8v measured at pin one of the Voltage Regulator and PLL) but now it seems the PLL maybe dead.
I also added a frequency counter to make sure i was on the right freqs.
Now when I xmit (got a good 1/2 wave inverted V dipole that i tested with another radio) the FC reads either one of two issues:
sometimes the radio will sound normal (normal radio static) on channels 1 through 29, and the FC will read around 27.7 through 28.5ish depending on the channel. 30 through 40 are really quiet. If i tap pin 8 on the PLL with my finger, all the channels will go really quiet and when I check the freq, all channels report back at 27.5 or so. If I tap pin 7 it will go back to channels 1 through 29 working.
Sounds to me like the PLL is malfunctioning, but i wanted to get some input from others on the forum before i shelled out the cash for a new one.
Any help would be greatly appriciated.
Thanks
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