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Well, that should have been CDMA, not TDMA :-( I've attached a short proof of the mathematics. It assumes synchronization, but I left out that detail to keep it to a single page. The objective is

That's been my historic practice. Ultrasonic was a new idea. Might need to reconsider that.

I just clean the flux residues with isopropanol and an old toothbrush, trying the (already dirty) liquid does not get into tact switches, trimming potentiometers, trimming capacitors, dip switches,

Be careful with circuit boards in an ultrasonic cleaner. The bond wires between header and die can be broken by the ultrasonic energy. Glenn --

Additional references: Synthesing Vacuum Tubes QEX magazine, 1997 Aug. - Put that old tube-type receiver back to work by replacing the burnt-out tubes with JFET circuits: By Parker R. Cope

Well, add another flux repair to the list. LG window AC wouldn't work as in no response at all. On inspection board was saturated with flux. Cleaned it and it immediately started. I'm beginning to

I'm a retired EE and a lifelong ham (WA3UQV). I was first licensed as a Conditional Technician in 1972, and sat for my Technician, General and Advanced class licenses, a year later, down at the old

I designed my own VNA https://www.github.com/profdc9/VNA and because calibration of the VNA requires the open, short, load, and thru measurements to be stable, even small changes can influence the

Yeah! Flux residues and dust are not to be overlooked. Let me tell some of my experiences (though not RF related), just to show how slippery they can be: The onboard regulator on a PLC peripheral

When I was living in Houston I had 2 VCRs die, each after about a year of light use. I took one apart to strip anything useful and observed that the entire board was covered with flux which is

Basically, nothing. I'll post a detailed summary of the presentation after I finish my HVAC install as it's rather hot now here. David scheduled it to start art 7:30 pm, 30 minutes before the vendor

So, what came out of this meeting? Jerry W KI4IO Warrenton, VA

Anyone know of any work on sending Morse via PRN DSSS carrier symbols? That is use a specified PRN to modulate the carrier to spread the spectrum and send a dit over more BW, e.g 1 kHz. This

https://harbachelectronics.com/

I'd like to suggest posting this to the army-radios list. Glad to have it here, but it should be of interest to them also. Have Fun! Reg

Thank you Daniel, Ray, & others... Gettering the PA tube is important. One of my 3-500z tubes has a blue glow .. so hoping to address & condition that prior to

Of possible interest ? *Solid state replacements for tubes in some common older Ham? tube Rx :* -- A single common FET is used for each tube, in these Rx. MPF102 : JFET VHF Amplifier? (

Ultimately, the time-bandwidth-power product of a communications protocol must exceed noise by a suitable margin in order for the signal to be detected reliably. By design, the antenna signal input

I'm arranging for a SIG meeting room at FDIM. Probably Thursday. I've left all the details to David Cripe. I've requested a whiteboard only. If someone needs something else, please contact me or

Aligning the dit frame is a classic application of the Fourier shift theorem. A shift in time is a multiplication in the complex frequency domain. If one takes the DFT of the series