I have a Syntech I 70-530 that was programmed:
442.000 RX
447.000 TX
We just changed it to:
449.850 RX
444.850 TX
Display shows 95 after powering up, that was expected, VCO unlock.
According to the service manual i should adjust L702 while monitoring the test point T701 and set it for 5.5v. Can't do it, its at 6.89v and that's where it stays, i moved that slug from top to bottom three times in a small increments and watching the meter while moving it up and down, voltage doesn't change.
What do i need to do to get the VCO to lock???
Syntech I VCO Mod/Adjustment??
Syntech I VCO Mod/Adjustment??
"Bite My Shiny Metal Ass!"
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- Posts: 68
- Joined: Tue Jun 03, 2003 8:23 pm
- Location: North Carolina
Re: Syntech I VCO Mod/Adjustment??
Scott -
Sounds like it was reprogrammed with a wrong header code.
Did you read the memory module and edit the data or try to create a codeplug from scratch?
Sounds like it was reprogrammed with a wrong header code.
Did you read the memory module and edit the data or try to create a codeplug from scratch?
Andy
--------------------------------------------------------------
NC Certified Firefighter III / EMT-A
FCC Licensed Technician / Amateur Call NC4AB
http://www.brinkleyelectronics.com
--------------------------------------------------------------
NC Certified Firefighter III / EMT-A
FCC Licensed Technician / Amateur Call NC4AB
http://www.brinkleyelectronics.com
Re: Syntech I VCO Mod/Adjustment??
I figured out the problem, the 2716a editor that i got off the MidlandLMR yahoo group was only intended for VHF radios. Too bad the guy didn't make one for UHF also.
Anyway, problem solved. Used the 70-1000C software to fix it. I pulled the memory module and desoldered the Eprom, read it, modified the file in the 70-1000C software, saved the file, loaded the file with my eprom burner, erased the eprom with uv, burned, and dropped into the radio. All is well.
Glad i don't have to do that very often!
Thanks for checking in.
Anyway, problem solved. Used the 70-1000C software to fix it. I pulled the memory module and desoldered the Eprom, read it, modified the file in the 70-1000C software, saved the file, loaded the file with my eprom burner, erased the eprom with uv, burned, and dropped into the radio. All is well.
Glad i don't have to do that very often!
Thanks for checking in.
"Bite My Shiny Metal Ass!"