Hi Bill, At the risk of starting another AC ground / neutral war,, it is always ok to connect any grounds together. It is not ok to connect a neutral and ground together except at one place, the mai
It doesn't matter which wire you use as hot and which one is switched when connected to a switch. I have a wiring book that has two different examples. One way white is hot to the switch and the othe
A GFI circuit does not rely on a ground connection for operation. It only monitors to see if there is a difference in current between the hot and neutral wire. 73 Gary K4FMX ________________________
But when you mark a white wire with black tape it is no longer a white wire, it becomes a black wire. You can mark any wire any color you wish to and use it as the color you have marked it and it is
It could be due to leakage to earth or it could be a path through your body to earth if you come in contact with the hot lead. Or it could be if the hot comes in contact with the ground lead. A GFI
There are no color coded terminals on switches. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
You are trying to make it complicated when it is not. Suppose your neutral does open with a four wire circuit, your 120 volt fan just stops running. Same thing happens to your 240 volt power supply
Very good point Peter! That is the whole reason in a nutshell for having a safety ground separate from neutral. An open safety ground does not force the chassis hot. An open neutral WILL force the c
How about if the blower itself burns open and stops? If you are concerned about the blower not moving air then install an air flow sensor switch in the air path. Of course I suppose that switch coul
Hi Tom, Put the resistor in series with the input coupling capacitor. If you want to experiment with negative feedback with multiple GG drivers you might try link coupling between stages. You can rev
An unbypassed cathode resistor in a grid driven amp does in fact provide negative feedback. It is often done in audio amplifiers to improve distortion. As the grid is driven positive the plate voltag
Tom, Also look at the schematics of the Collins KWM2 or 32S1 and the Collins KWS1. They all use negative feedback and show real values. The collins uses what they call a "feedback neutralization" cap
Hi Tom, You do have a spectrum analyzer in your shack! Your receiver. Modulate the transmitter with 2 tones and tune across with your cw filter on another receiver. Note the level of one of the tones
Good point Karl-arne. Because of this it is important to keep the signal level relatively low into the receiver. 40 over S9 is probably pushing it on input level. An easy way to tell about receiver I
Tom, As a follow up to specing IM products to PEP. Some of the same tricks are used by manufacturers when specing 3rd order intercept points for VHF/UHF pre amps. Some will spec them with reference t
Yes Steve, it is important. One signal generator coupling into another can create IM in the output amp of the signal generator. An attenuator should be used on each generator. Some generators are rat
Hi Tom, Here is some more info for you to look at. Qst July 1967 page 34 is an article by Orr on super cathode driven amps. He shows the difference in IM performance on the 4CX350 in this configurati
Those figures are too good for a 4cx250B. They are probably referencing to pep. Looking in the (older version) "care and feeding of power grid tubes" they show the 4CX250B at 348 watts pep output to
Yes I see you are right Steve. I don't know where I got it from that changing one tone would give those parameters. Must of had a bad dream. I do remember that receivers always have the characteristi
Seems kind of curious that the difference he talks about is 6db. Maybe he is using PEP as a reference and the others are using one tone of a two tone test? 73 Gary K4FMX _____________________________