Rick, Those W5KA FD loops, were horizontal plane loops, straight legs run from support to support. Supports varied from tower section, to slip up mast to out of service wood utility pole(s). They wer
A hunch on BFO trimmer frequency drift. It might not be the trimmers but any associated fixed disk ceramic caps. Try slight heating of any one by one. If a big jump happens, that one might be suspect
Bill, sounds like you need to invest in a disconnect switch to isolate your station equipment from your antennas during storms. Believe me it is not if you will get a hit, but when. 73, Stuart Rohre
I think QST had a piece on balancing tube emission characteristics. That would probably let you match them "close enough". If they were made pretty close to the drawing for standard tube of that type
It is true you can often substitute a 4 or 8 ohm speaker, if the driving amplifier has enough power to drive 4 ohms. You can make a test with a resistor to see if the amplifier can deliver the curren
I would not worry, all manufacturers have the same problem with discrete parts now or retaining sources for them. When the volume of speakers sold and used for Jupiter dried up, OEMs cut back on thos
There has been a large solar sun spot about big enough to hold 10 earth sized objects pointed right at Earth. It may be producing solar weather leading to HF propagation artifacts like noise. Check t
One problem I have seen that leads to either RF feedback or noise is a bad coax jumper cable, if you have a coaxial pass-thru a wall and have to use a jumper to your rig. The most unusual noise probl
The O2 having the same symptom after an RF mis-direction is a big clue. I would suggest that might have been the same issue with the Eagle. If your coax cables used to dummy load and to antenna prove
NTE and other cross reference general replacement semiconductor companies should have crosses to the MPS devices. Don't overlook Mouser, distributor. They have vast stocks and fast service at reasona
Re-seat all plug in cables associated with the 20m section of the receiver. Check tightness of any screws that serve to ground the ground plane of the board. Inspect the bandswitch with a strong pen
Very likely the Tuner was hooked up to the antennas and endured a build up of wind or snow static charges, which took out the diodes that sense SWR. Check those for shorts or opens first. Is the ante
As a follow up to Bob's comment about checking for continuity between safety ground terminal on an outlet and neutral; it is my understanding from current codes, written up in electrical trade magazi
Indeed the Zepp antenna used in early ham days was the half wave end fed with a quarter wave of open wire line at right angles to the shack, for matching. To transform the high end impedance of the d
Gus, just a guess; but check the diodes in the ALC circuit for an open one or shorted. Have you had any big thunderstorms lately? If Rig was on an antenna during as storm, much damage can happen. Goo
It is always good to exercise all rotary controls like band switches, etc. after long disuse. Also push buttons. This can be done with rig off. You are just breaking oxides at switching contacts. Nex
Certainly near by terrain affects your station antenna pattern, in the case of obscuring a clear low angle of take off. That is a near field effect. However beyond the Fresnel Zone, (3 to 5 wavelengt