Home |
Search |
Today's Posts |
#1
![]() |
|||
|
|||
![]()
I have an HP 606a and was planning to use it to calibrate my SX-101a,
which has a 50.75khz 2nd IF. Well... the generator won't go down below about 55khz. I opened it up to calibrate it using an HP 5245L counter. At the very top after about 62mhz, the output drops to about 55mhz if you try an tune any higher. At the bottom, you can't get below 55khz. Dials show capable of 50khz to 65mhz, and I believe I have read where others have said it will go to 45khz. Checked the tubes... didn't notice any bad components. The oscillator voltages at all pins are bang on, as is the dial calibration on every band everywhere but the extremes I mentioned (this was after I calibrated it). So is this just the way they are? If not, does anyone have a clue what might cause the oscillator to not be capable of the highest and lowest extremes? I did notice the tuning capacitor trim tabs were used a fair bit, so I am wondering if someone trying to get great dial tracking, which it has, shot out the extremes in the process. Do I have an option in calibrating the SX-101 by heterodyning the 100khz reference output of the counter (which is damn accurate) with the HP 606 set at 150.75khz to get the 50.75khz I am looking for? If so, do I hard couple, loosely couple or what? Will the other frequencies running around in the radio cause any calibration issues? Thanks a million for all the help this group has been to me. I repay the favors when I am capable, and that is better every day. Dan |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Changing design frequency of K2RIW 432 MHz yagi | Antenna | |||
Resonant frequency | Antenna | |||
Confirm the resonant frequency of this folded dipole | Antenna | |||
FT-101e t/r frequency | Boatanchors | |||
BC-906-D Frequency Meter | Boatanchors |