If you are talking about the RCA jumper from the RF front end to the IF, be aware that the B+ for the mixer is carried to the RF deck through this jumper. Also, be aware that you will be hooking your RF signal generator output to the regulated +10 coming from the IF board if you input a signal to the RCA input on the IF board. This might account for the burned resistor mentioned.
73 - Jim W5ZIT -----Original Message----- From: ve7ltd <[EMAIL PROTECTED]> To: [email protected] Sent: Fri, 29 Jun 2007 8:30 pm Subject: [Repeater-Builder] Re: Retuning 11.2 Mhz oscillator on MASTR-II The number is: PL19C320523G2 Rev A There is no direct hit for it, bit it is a 75Watt UHF mobile, with UHF exciter (non-tripler). The IF oscillator is dead, but I would like to troubleshoot it. The receiver tunes up fine until I get to "pin 7" and I get zero volts. I hooked my HP 8920A to the RCA output port on the IF oscillator and I get no output on 11.2Mhz. Upon closer inspection, the slugs in the tuning coils in the the IF tuning sections are loose, to the point that I flipped the reciver upside down and two of the three of them just fell out. I have never touched or tweaked the IF before, and I have not seen a step by step tuning. Thanks Dave Cameron --- In [email protected], "Eric Lemmon" <[EMAIL PROTECTED]> wrote: > > Dave, > > What is the number stamped in black ink on the edge of this module? If the > LBI covering your module is not already posted on the GE Master Index, I > probably have it in my microfiche file. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of ve7ltd > Sent: Thursday, June 28, 2007 8:57 PM > To: [email protected] > Subject: [Repeater-Builder] Retuning 11.2 Mhz oscillator on MASTR- II > > For some reason, the MASTR-II UHF receiver I have is missing the slugs > out of the tuning coils in the 11.2Mhz IF oscillator. Also the 1 ohm > resistor is cooked, but still 1 ohm. > > Everywhere I look, the LBIs say to tune the capacitor and coils, but > doesnt give any reference or anything. > > Does anyone have a good method to tune this oscillator? > > I have an HP 8920 and a working system to compare to, but a step by > step tuning process for this IF oscillator must exist someplace. > > Thanks > > Dave Cameron - VE7LTD > ________________________________________________________________________ Check Out the new free AIM(R) Mail -- Unlimited storage and industry-leading spam and email virus protection.
