Posted also to the Bayou Jumper Group: Another book to add to your fireside reading list: Scholars of Mayhem, by Daniel Guiet and Timothy Smith ISBN 9780735225206 (hardcover) or 9780735225213 (ebook)

will try to check in on 40 m with the prototype Bayou Jumper... be sure to listen down a bit... my xtal is 7121.7 Jim, N5IB

Hi again Dave, Look and see if the Nano has an option to display the reactive part as ohms instead of capacitor/inductor units. That'll make it much easier to interpret. For example - in your 30 m mea

Now, no one ever made a QSO with a computer model of an antenna, but software like 4NEC2 can be useful to gain some insights. Here's an attached simulated sweep from 80m to 10m of Dave's 72 ft wire. T

Go a step further with your Nano. After getting the swr data, also get the impedance information (R +/- jX). You may find one case of high swr involves a fairly low impedance, while another case is as

BTW ... of interest to many... There is a simulator of the T network tuner at: http://fermi.la.asu.edu/w9cf/tuner/tuner.html It's a great way to practice adjusting the beast without smoking too many f

Hi Dave, I looks like something is working as it should... but the trouble with that test is you're still testing two things at once - the bridge part and the tuner part. You need to isolate the funct

Dave (NM0S..... get ready to chime in here... I'm going to risk violating Mark Twain's advice ("keep silent and be thought a fool, or speak and remove all doubt) ... and try to explain the workings of

Hi Dave, First thing to do is determine if the problem is with the SWR bridge part or the tuner part. Unfortunately with this circuit you can' t test the just the bridge into a dummy load without havi

Congrats, Herb! Good catch. As a fan of the British mysteries, I love a good detective story where the perpetrator is discovered by good old fashioned sleuthing. Let the evidence point the way. BTW -

Hi Herb, I'm presuming you've fixed the earlier problem of low voltage on the Q3 collector? Before replacing any more parts, do a little voltage detective work for us. This will give some clues as to

This is a good excuse to do a little engineer/detective work involving the schematic and the data sheet. The schematic shows that the Source of Q2 is to be connected to the ungrounded side of R8. The

I'll share a little article I wrote for our club newsletter a few years ago PDF attached .... if I did it right :^)) Jim, N5IB

About two years back I made an OzarkCon QSO Party dummy load out of NiChrome wire. Measured off enough to have a DC resistance of 50 ohms, which was about 50 inches for some fine gauge stuff I had her

A really interesting book, about the challenges Uncle Sam faced as he ramped up crystal production in the 40's, is Crystal Clear, The struggle for reliable communications technology in World War II Ri

Hi John, The original (white panel) BJ didn't call for filling any of the vias with solder. In fact, it's not strictly necessary even on the later versions. Just provides a little more conductivity al

A few months back I attempted a scratch build of the Tx section of the Bayou Jumper, without success. The circuit is nearly identical to the NS-40, with some minor differences in L and C values. I use

10 to 25 uF would probably be fine if you just need one capacitor. But if you're using two, remember that they will be in series, and the equivalent capacitance will be half as great as the individual

The two output pins of the NJM2113 audio amp chip (U1) are each biased at about 6 volts DC. That's why they can't be allowed to be grounded - it shorts out the bias voltage and zaps the output stage.

JP2 and JP3 are only on the rev A(c) boards. You can find that "revA(c)" designation on the silk screened legend just above the L5 and L6 on the top side of the main board. The earlier green panel mai