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Just a few minutes from the time you posted the above about hearing some digital, I was pumping some digital at 10 watts, from the bitx, your direction. It makes a fine data radio too. Who knows, you

I use M3 Nylon and Brass spacers, nuts, and screws from Amazon and have had absolutely no problems with them. I look for a vendor that allows a selection of both sizes and lengths so they all come

I second the motion! -- John - WA2FZW

Peeps, Given the large number of mails, i much like manh others tend to skip mails that have subject lines like "issue" or 'my problem'. It would be best if the subject line describes the problems as

You can do multiband quite simply with juat two sets of filters : 1. Make on set tunable from 14 mhz to 30 mhz with a ployvaricon or any two section broadcast variable capacitor. 2. The second

Ok it's clear now. Thanks for the help I have a lot to learn. When I get a chance I will change that diode and try again.

Thank you for the advice. I already have a bunch of low pass filter boards from kitsandparts a few years back, so just need the bandpass units. I was looking at the qrp labs board, so that may be the

Hi, Over the months I have published a number of minimal hardware mods that are required for certain added functionalities in the Raduino software. I noticed it is sometimes confusing and hard to

Looks like D7 is a snubber diode for the relay K1. There's also a snubber diode D8 on relay K2 (near the blue trimmer RV1).

The Raduino has a 5V regulator to drop the voltage for the Nano soldered in. Raduino takes the same 12V that the BITX40 takes but brings it down to 5V. By mistake if you connect or a oops moment put

Thats confusing unless I'm missing something. The wiring diagram shows +12v to orange wire on raduino and black to ground

OK, folks - Tuning clicks conquered! Reading back on earlier messages here, it seems the regulator 7805 deserved some attention. I had fed this via 51E to drop a few volts and 'take some heat', and

Hi Brent,? ? ? ? ? ? ? ?There are one or two boards already out there that used fixed inductors and are set up for Multiband use. WB6DHW BPF Board springs to mind as it is one I tried. It was

Dex, Put a 1K to 10K in the brown lead going to the volume control. That should get rid of the hum. It results from LM386 getting unstable. Raj

"Standard" inductors have a verly low quality factor, so they are not usable for bpf?s having a narrow bandwidth. In contrast, the Coils Farhan uses carbonbyl cores, for his Coils giving an unloaded

Bill N2CQR wrote... https://www.youtube.com/watch?v=7z9NUV_YrOo So, if half of the BITX40 is made of Bosons, does it mean the other half is made of Fermions? It's all over my head. I just turn it on

It's a SMT 1N4148. It can take about 1.5A forward current before overheating and giving up the ghost. It is a cheap and common diode if you have to replace it. If the reversal was short enough, most

Nothing special, just a 4148 I believe.

Wow I actually did have the voltage backwards. I was trying out this down converter with 4 18650 batteries and they have the negative out labeled as positive. Does anyone know the specs on that diode?

D7 is in the VCC line right next to the relay K1. Check your wiring. It seems likely that you applied 12v to the Nano (or reversed the polarity), which probably fried it. If K1 coil is open, then the