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

That'll be the 22 pF cap for use at C31 if needed. The "220" means 22 x (10 to the power zero) = 22 x 1 = 22 pF Much to small a capacitance to use for the DC block at the audio output. That will have

The cap marked "10" is most likely the 10 pF cap included in the Bayou Jumper kit in case you needed to use it at C20a to lower the receive tuning range. There would have also been a 22 pF cap to be u

Check the information in message #16937 on this forum... N5IB

The Soup'er does NOT provide any DC isolation on the speaker lines. So you still need to make sure that neither audio output lead has a DC path to ground, as you saw in the Appendix of the manual. If

Hi Ken, We've had some reports of the Tx section of the Bayou Jumper giving troubles, and in at least a few cases the trail led to the final transistor Q4 (IRF-510). It appears that certain "flavors"

Far and away my favorite is a Brown Bros. CTL-B(a) straight key and paddles combo Now this key is unique, hence the '(a)' - there is not another one like in on the planet - you'll notice the arm of th

Mouser Electronics... Reliable domestic (Texas) vendor for legitimate parts... https://www.mouser.com/ProductDetail/Vishay-Siliconix/IRF510PBF?qs=sGAEpiMZZMshyDBzk1%2fWi1F3z9PgzPBnjAas2zQPJco%3d 91 ce

It's a Group still on Yahoo: https://groups.yahoo.com/neo/groups/BayouJumper/info And the EZ Keyer3 will NOT properly key a Bayou Jumper. It's BS170 output stage can't handle the current and may pop.

Also... what kind of keyer are you trying? A lot of them, especially those made for QRP rigs, don't have a robust enough output stage to handle the current the BJ requires. Jim, N5IB

Look over on the Bayou Jumper Group... there have been some posts that addressed this... including making a little keying circuit to help out Basically, any excess resistance in the key cables, key ja

For those who assimilated the presentation that Nick and I gave at OzarkCon last year, making your own PCB for the current limiter would be easy. The pattern is reproduced in the PDF document. Alas, t