Allen, Look for higher collector breakdown voltages to mitigate any transients. The 2n3055 is a bit puny in the voltage breakdown dept. Pick silicon with higher PIV, and similar Beta as the 2N3055. I
With the autotuner function you essentially have an antenna analyzer built in to the Eagle, just it does not read out the SWR (or does it?) to the User. A true analyzer should be portable hand held i
Good point Rick, but here rain equals lightning, so we QRT antenna work at that point. SAFETY first. Recently we also set some other rules for tower work: 1. no climbing if wind is over 12 mph, (if t
Rick, Excellent additional rule! WE get worked out by dark, but sometimes someone gets ambitious to finish something up. I am sure others in harsher climates can contribute more rules. Watching one's
For the recalcitrant sub reciever and receiver, open up the rig and reseat after cleaning the cable's connectors. But also, take a strong work light and magnifying glass and examine all the solder co
First thing to check are the diodes in the pick up lines for SWR metering problems. With radio off test all four diodes with ohm meter front to back resistance check. If you need greater detail mail
Kim, and the group, This is a problem I think all of us who put up Holiday tree lights experience at one time or another. After several years of helping a non ham friend with her tree lights, I confi
Low ESR should be something coded into the factory complete part no. that may or may not be fully given in a distributor catalog. In that case, visit the web site of the capacitor manufacturer to fin
Most likely the 2.4 kHz filter is what today would be called a roofing filter, and is in front of the switch, so it is always in the circuit. Hence, 3 selectivity positions, each more narrow than 2.4
On 20 year old rigs, if you have crystal based filters, they will drift over time in a process called crystal aging. The amount may vary depending on the temperature extremes experienced by the rig o
The capacitors that were electrolytic and failed en mass, show signs of the case diameter swelling up. If the seals crack and start to leak white chemical, then the capacitor is toast or will be. Bet
Since one transistor position has the same incorrect voltage on all leads, I would look for a short. It might be solder splash on the under device side of the board. It might be a faulty coupling cap
A big clue to the faulty receive is the fact that Q6 has normal voltages in transmit but all the same voltage on pins in receive. The transmit and receive busses switch something that is throwing Q6
I would call an award the act of earning a certificate in some category. The document earned is the certificate. Diploma means a certification from a University or College or other educational instit
Rick, Award sounds more universal in English than even certificate. Most hams know awards can be the achievement of some operating level of skill, and that it also can be the grant of a paper testify
If you want to be free of the prospect of frying a Balun, put up a balanced antenna, and feed it with one of the DX engineering heavy duty Baluns. An OCF antenna is a compromise, as you can never exa
True,the theoretical impedance of free space is taken as 377 ohms, but no earth bound antenna is in "free space", which implies well away from other couplers, earth, ground, counterpoise, etc. The ni