How about the change from condenser to capacitor?  Since that changed the component from something that condenses a vapor to a liquid, to something that stores a liquid, shouldn't we have changed "Farads" to "quarts"?

"Before the 1920's the frequencies above 5 MHz or so were considered useless for any decent DX propagation.  Hence most everything above 5 MHz was given to HAMs and experimenters."

Also don't forget that in the very early days of radio (before oscillators) RF had to be mechanically generated.  The higher in kHz you went (DOWN in meters), the harder it was to obtain RF to transmit and was considered an extra expense to commercial users.

Allan - N4NLQ

Forget the diode.  Cut the PC board trace between the wiper of the voltage adjustment pot and the regulator chip in the Astron.  Bridge this cut with a 10K 1/2 watt resistor and adjust the voltage as desired.  This current limiting resistor keeps the supply from trying to suck the battery back through the regulator chip should the AC power fail.

Allan - N4NLQ

Mounting antennas on your plumbing vent pipe is not a good idea.  Antennas will move a bit in the wind which makes the pipe move also.  The pipe's movement can loosen the seal that keeps the rain out and your roof may start leaking.

If your house wiring is done in the attic and not the basement, you have a way to drop your coax into almost any room.  Since interior walls are not usually insulated, you have hollow spaces in which to run wire.  Pick a wall outlet you want your coax routed to and TURN OFF THE BREAKER.  Drop your coax down the hole in the header plate next to the house wire and fish it out beside the outlet box.  If the outlet is hidden behind furniture, just snap a corner off the cover to allow the cable to exit the wall beside the box.  If the outlet is in plain sight, move to the other side of the hollow space, cut a hole in the drywall and set a new box.

Hope this helps.

Allan - N4NLQ

Don't forget a known problem with the Kenwood TS-430.  The 5805 5-volt regulator on the IF board can cause the same symptoms.  Re-solder the 3 PC board terminals and re-seat the tab against the shield/heat sink and it may cure the ailment.  TS-430s have a lot of soldering problems.

Allan - N4NLQ

I had the same problem with one of my TS-430's and it turned out to be trouble with the encoder assembly.  Since the TS-430 features electronic tuning, no variable capacitors, dial cords, gears, etc., the tuning dial turns a slotted disk between a pair of light sources and photo-transistors.  This assembly not only detects how far the knob is turned but in which direction.  The pulse string generated by the encoder is fed to the frequency determining elements of the Local Oscillator to tune the rig. 

In most cases, repair of the encoder is best handled by a pro.  I sent mine to the Kenwood Authorized Service center in Virginia Beach, Virginia.  Google "Kenwood Factory Service" to find the one nearest you.  Parts may be a problem with a rig that old, but I think all mine required was cleaning and alignment (I used to smoke).

Your experience may differ but that's what mine required.

Allan - N4NLQ

"I have a commerical amplifier (medical) application requiring a 20 watt driver at 40.68 MHz."

Will FM work?  That frequency is adjacent to the Land Mobile band of 38-40 mHz.  Can possibly an old FM GE Phoenix or somesuch can be programmed that far out of band??

Just a thought.

Allan - N4NLQ

Give this a try.

http://www.panix.com/clay/ham/pl.html

Couldn't find any Santec specific info but maybe they "borrowed" from one of these manufacturers.

Allan - N4NLQ

I don't want to start a "my PS is better than your PS" debate but buying a 20 amp or better power supply is a wise investment.  You'll never regret it.  I've had very good luck with Astron linear (analog, bigandheavy, etc as opposed to switching) brand power supplies.  Get one with meters if you like but they're not really necessary.  Once you get it installed, most anyone can tell you the simple mod for battery float.

Allan - N4NLQ

Amateur grade radios are no longer usable on Civil Air Patrol (C.A.P.) frequencies due to a realignment from FCC control to NTIA control.  

For MARS, your State Director will have, or can obtain, the information you seek.

Allan - N4NLQ

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"I was mixing posts together in my short term memory. (Would be nice to be able to see those posts while typing the response.)"
- - Quotes Added - This line would have normally been deleted before posting.

K5END:
Do as I just did: highlight and copy (CTRL C) the original post then hit REPLY and paste (CTRL V) the original post into the message window so you can read it while you type your answer.  Toggle back and forth between the Preview and typing windows until it reads the way you want.  Delete the original post that you copied over and let the system accept your work.

A little awkward perhaps, but it works.

Allan - N4NLQ