PCS-Electronics

OK 7-year old thread, however I just got a new spectrum analyzer (I.e. "toy") and in educating myself about its capabilities I recorded the spectra of one of the last surviving HD radio broadcasters in our area--a PBS station of course as they do not really have to worry about turning a pr...

Providing detailed information for re-engineering the MaxProI to use the 2SC2539 would be a decidedly non-trivial task, and as the fellow from Norwalk Electronics stated; "This would not be a project for a beginner since it would require mounting a transistor with a different case style and pin...

Antennas sold as "requiring no tuning" perform acceptably within the band for which they are intended--I.e. they may have an SWR of 2.0:1 at one end of the band, 1.0:1 somewhere in the middle, and 1:8:1 at the high end (all depending upon the transmitter's actual output impedance, actual c...

There are many excellent "beginner" and seasoned pro tutorials on SWR (more correctly VSWR) available on the web--search Google for "Understanding SWR", "SWR tutorial", "SWR meter", etc.

Search and do some reading, all the answers you seek are out there...

I'll start by clearing up what I perceive as a misconception. An SWR meter by itself does nothing to improve the strength of your radiated signal--it's just a tool that lets you monitor the matching of your transmitter's output to the load presented by the antenna (by adjusting the antenna's element...

When dealing with a heat generating sources within an enclosure I tend to prefer to pull the heat out, with make up air being delivered through strategically placed louvers/perforations/etc. I don't know that it makes any difference with the levels of heat we're talking about here, however the basic...

Hot air out, preferably with the heatsink located somewhere in the airflow's general path--unless... You have a good way of directing the flow of air you are pushing in. In my MaxPro I rackmount enclosure I have two 40 mm fans at the rear of the enclosure and perforations on the side next to the exc...

Read this, then come back here and ask questions.

You'll need to garner a basic understanding of electrical and electronic engineering before the answers your are likely to receive here will mean anything to you...

Cool...

The inverter for the laptop will be grossly inefficient, output from the solar panels will be reduced on overcast days (dependent on the amount of overcast of course)--so you'll need to have a large enough battery to get through cloudy periods and sufficient generation capacity to recover from exten...

what kind of instrument are u using for this mesurment? wattmeter Telewave 44A. The 44A is rated for +/- 6% accuracy at FM broadcast band frequencies, this is +/- 6% of full scale. So at the 5W setting it will be accurate within +/- 300 mW meaning that a meter reading of 500 mW could really be anyw...

I have at last found time to perform some solid analysis of the real-world performance of my MaxPro I/SE3+ package--the .PDF file found here contains audio separation. frequency response, s/n ratio, and THD+N measurements made today, along with a description of the equipment used...

Oh, BTW, if the "masses gave a rat's backend about fidelity do you really think that nearly every commercial broadcaster would put out the compressed to 45 dB dynamic range, +20 dB bass boost, overmodulated crappy signal they do? NO--they do this to be the LOUDEST signal on the "dial"...

You are correct in pointing out that I should have qualified my comments as to their distinct relation to the FM implementation of HD Radio--the AM incarnation is quite innocuous and will I suspect be as much of a dud as C-Quam...

HD Radio (HDR) is a load of rubbish, part of a scam power-grab being bullied through by the NAB and a bunch of other people that think they can make bunch of money by exploiting the FM broadcast band. For years the FCC prevented adjacent channels from being occupied, and the NAB supported this--this...

PC sound card based solutions are really neat, and there's a lot of very competent freeware stuff out there, however there are a couple of issues to be aware of: They can be inexpensive IF you have a PC with a good quality sound card that you can dedicate to the job (depending on your hardware, cert...

Anything from Behringer is top-notch, many of the "composer" units can do exactly what you wish to do--poke around at their website and you will learn a lot...

There seems to be some part of "designed to operate between 136-175mhz" that you don't understand... Seriously though, there are many "HAM" amps that can be re-engineered to operate in the broadcast band--some with relative ease, some with more difficlulty. So, if your question i...

Mea culpa as well, I hadn't paid any attention to the original posting date...

Pre-emphasis is applied to the each audio channel independently, after the 15 kHz low-pass filtering, and prior to stereo encoding. It is ususally (in our class of broadcasting) applied by the stereo encoder, in your case the SE4 will do this, and according to the manual (you did RTFM, didn't you?) ...