on. Any it seen on Provided that the Bird directional coupler matches the characteristic impedance of the line, the metered results should be reasonably accurate. Interpreting the displayed results
impedance of the line, the metered results should be story. matters is what the meter sees. Not according to my Bird 43 operating manual. If you have one, see section 3-36 on p. 19. Also see the not
Hi Mike, I contend this is true when a conjugate (reactance cancellation) exists at the source. Typically, this is accomplished by the ubiquitous transmatch, auto-tuner or Pi-network within the trans
section sometime it match. see a mentioned Granted. It is a principle of transmission line theory that the impedance is identical on either side of a half-wavelength. I believe the point in the Bird
Thanks for jumping in Tom. Whether all the power is absorbed in the PA does not matter to me as long as some of it is. My point is that my transceiver which is drawing 20-amps DC at 13.8 VDC is diss
Correct in that the unterminated end of a line presents no load. Without a load on the of a transmission line, no power is dissipated. However, power is being generated and dissipated somewhere. Why
I don't think this point needs repeating. There has never been an argument here. See my conclusions from the four-step test I conducted. I would still like to know: 1) Where power is being dissipate
I'm OK with this Steve and I understand Ian's clarification. The Bird is sampling RF voltage across the load that does not exist. I should have left out any reference to the Bird reading 100-watts o
My example is relevant without the need of the Bird wattmeter. I fully accept the fact that the directional coupler samples RF voltage. I'll respond to you as I did with Steve. Namely, in the absenc
Excellent point Kim. The term is oftentimes used as a convenience to represent the combined voltage and current terms. I am guilty of it. Taking this one step further in absolute correctness, would
I ran into the same issue many years ago when I owned a SB-230 conduction cooled amplifier during my high-school days. The in-rush was so strong that the ON/OFF rocker switch (with internal circuit
"NEVER 'consider' or tie neutral to ground. They are NOT the same.... Neutral carries current by design, the ground should never carry current unless there is a fault." An excellent point Bill. All t
others) as the "Neutral"? No, unless that "ground" is normally carrying current. The ground should not be acting as a neutral (even though they are at the same potential being tied together at one p
the two chassis. breaker This issue is important enough to beat-up until it becomes clear. They are correct in that you do not need a neutral for 240VAC operation with the SB-220...but you still req
amp These I've seen solid-state zero-crossing switches used for this purpose. However, maximum current is achieved in just 90-degrees at 60 Hz (assuming no zero reactance in the circuit). This equat
However, the FT-1000 genre of transceivers address the leading edge overshoot issue through the use of a fast ALC response time. What's the negative side-effect? CW clicks due to an unusually abrupt
Check with Dick Byrd, N4UQ. Dick specializes in the repair of older Alpha amplifiers. I know for certain that he has upgraded some 77Sx/Dx amps with 80 uF of high voltage electrolytic capacitors and
Indeed, Joe, when run properly (at a 4 to 1 ratio), low-level modulated, linear-amplified AM has way less audible distortion that traditional plate-modulated AM. This is also backed by the numerous o
"Oh well -- I guess I'll keep on using AM at 9 kHz of bandwidth all the time istead of the 4 to 6 kHz that I would normally have been running on SSB. Be careful what you ask for." Well put. The AM gu