Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 20 Aug 2006 21:14:23 -0500
The PTO in my Corsair II was slipping. The balls of the vernier had worn a groove in the outer race. It needed all those new parts. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, el
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 22 Aug 2006 08:45:00 -0500
IT DOES MAKE A DIFFERENCE! When you switch white, you do interrupt the power to the transformer, so it has no output, BUT, you leave all of the power wiring hot with respect to ground while the cord
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 23 Aug 2006 09:21:37 -0500
And if the radio used a 0.05 paper to chassis from each wire to sort of ground the chassis, the current in that capacitor will sometime trip the GFCI, even if the capacitor is good. More often that p
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 29 Aug 2006 13:48:43 -0500
I did something like that in 1963. I had a little tuner and so I wasn't too picky about the load Z. I couldn't reach the down spout, but I put a copper hook on a short pole and reached up from the sh
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 06 Sep 2006 18:55:10 -0500
On Wed, 2006-08-30 at 10:32 -0400, john.brewer@us.schneider-electric.com wrote: The crowbar has no effect on the short circuit capability of the power supply. It only comes into effect when the outpu
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 07 Sep 2006 15:53:27 -0500
Loose filters might make this, more likely its the TRX switch on the back that connects the receiver to the internal antenna switching circuit or separates it for using with a separate antenna as was
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 08 Sep 2006 16:13:41 -0500
I've fixed many radios by tightening the board ground screws. The board material relaxes under pressure and takes the pressure of the contact. TS-120 and 130 go into transmitter oscillations on the h
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 11 Sep 2006 14:50:59 -0500
Use a tuner with the G5RV or go to a center fed wire and a tuner. Getting it higher helps reception more than tuning though. -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrica
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 12 Sep 2006 09:13:07 -0500
There are tables of attenuator resistor values in many radio handbooks, ARRL and some RSGB included and sometimes formulae for designing them. Use 2 watt metal film resistors and they will handle all
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 12 Sep 2006 11:37:38 -0500
For sure! -- 73, Jerry, K0CQ, All content copyright Dr. Gerald N. Johnson, electrical engineer _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.c
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 18 Sep 2006 22:00:59 -0500
I'm sure its in the archives, because I remember that I posted it a few years ago. The cost was small from Mouser (www.mouser.com) Another really good source is Tentec. I've heard of them sending the
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 21 Sep 2006 18:33:51 -0500
When one output is open collector, and the other is open contacts, wiring them in parallel makes a WIRE OR, and the diodes aren't needed as far as I can tell. It could be that the 1N4148 will have a
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 22 Sep 2006 08:41:23 -0500
Sounds just like my Corsair II was when I got it. The tuning was most difficult at the lower frequencies in a band. That's because the screw loading spring is more compressed with the slug deeper in
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 22 Sep 2006 10:20:15 -0500
The rebuild kit with all the parts grease costs about $25 from Tentec. Its not hard to install, but tedious and its a good idea to work on a serving tray to capture the three little loose balls. It i
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 22 Sep 2006 22:27:20 -0500
Like selecting a battery system for back up and for a RV, there are arguments in all directions. Sometimes one gets the most power for the buck going with 6 volt golf car batteries. Two in series. Th
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 24 Sep 2006 14:06:04 -0500
This will not pass inspection. You are trying to supply a subpanel that requires a 4 wire cable with a three wire cable. The addition of a local ground rod does not meet the code requirements, nor is
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 24 Sep 2006 14:14:29 -0500
I don't know for sure about Tentec designs, some exciters seem to be more tolerant of varying loads than other brands, but in the optimally designed PA, the load impedance to the transistor is picked
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 24 Sep 2006 16:06:17 -0500
By the National Electrical Code you aren't supposed to use an extension cord for any application except one that is temporary. You are supposed to get a permanent outlet wired so that the extension i
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 24 Sep 2006 16:33:05 -0500
I recall the NEC only allows taping to change the color of a conductor identification in cases where only one color (typically black) is sold, not in a premade cable like romex. -- 73, Jerry, K0CQ, A
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 25 Sep 2006 09:14:01 -0500
If you keep the batteries on charge while using the PA, the voltage will stay up pretty good, so the power output droop won't be as much as from running on the batteries alone getting down to 12 volt