I have Operators Manuals for the 563, Omni VI, NOT Omni VI+. The BFO adjustments in the 563 are all variable capacitors, not variable inductors. C12, C13, C16 and C18 are the variable capacitors to a
I'm not finding the part number for U1. I do not see it as suspect for a RX sensitivity issue, since the documentation says it is an active mixer circuit used in transmit mode. If the T/R mode switch
There are about two possible reasons a good tube will draw excessive current when it has no drive. 1) The bias is wrong. 2) There is an oscillation. Even "Zero Bias" Triodes have circuitry that estab
My first guess is a noisy local oscillator. Phase noise in the LO PLL system. Since it happens on all bands I would look at parts of the LO system that common to all bands. The 5 to 5.5 MHz VFO maybe
My Hercules II does not have a speaker. What have I been missing? Does the Hercules talk? Complain about high VSWR or unbalanced currents to the PA modules? DE N6KB
I guess I'll have to take a closer look at my Hercules II. Maybe it does have a speaker and I've just never used it. I've never had a RF power amplifier what had a speaker and never thought of it. 73
What you really want to know is whether the receiver is performing properly. I wouldn't mess with the S meter adjustments until I had a better confidence that the gain from the RF input to the place
Don't know whether you can get Caig products shipped to EU. Pretty sure you will find them on Amazon. You may also find musical instrument stores (that sell electric guitars) carry it. The Caig Labor
I believe the switch on the power supply actually switches the AC primary power. In that case the switch needs to be rated for 250 VAC and appropriate current. The switch on the radio controls a rela
If you have a stable general coverage receiver you can listen to each of the oscillators to see which one is drifting. May have to experiment with methods of getting a sample of each oscillator to th
The band select oscillators are supposed to be locked to the 20 MHz reference oscillator. In that case changes from band to band in offset from correct frequency could only occur if the reference osc
Don't do that for a long time. The output matching network is designed for the plate impedance of two tubes in parallel, which is one half the impedance of only one tube. The variable capacitors in t
The 10 Mhz reference oscillator (the TCXO you just replaced) and the BFO both have to be set correctly. There are several BFO adjustments and some of them interact with each other. So you may have to
I have found that LED replacements for bayonet based lamps tend to be somewhat directional. The light does not diffuse as evenly as from a filament lamp. Maybe newer ons have improved on this. It is
Until you connect it to an RF wattmeter and a 50 Ohm termination (dummy load) everything is just guess work. The MFJ tuner may have a semi-accurate forward power indicator. If you had logged the read
I had not heard a Ten-Tec recommendation against DeOxit before. I use it on connectors in my Omni VI and Paragon. Also on potentiometers and switches. Never on PCB trace pushbuttons though. What kind
There should never be "legal limit" power level on any transceiver antenna port. The maximum power level should be the transceiver's transmit power, and it should only be on the tx/rx port when trans