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BITx40 is a two board dedicated 7 MHz SSB receiver designed for use on the radio amateur 40 metre band.

One of the two boards is home to the Raduino, a standard Arduino Nano you can write to in C, to create more modes, bands, and utlilities, even a multi-VFO widget, if you wanted to.

Mr. Walrus I've watched a couple of youtube videos on soldering connectors to coax. Is that what you are talking about?.....instead of crimping? Is there something in particular I should be looking at? Soldering guarantees that you have a very low resistance connection - so long as the metal surfac...

RG213 is thick heavy stuff not suited to a small bending radius or circuits where the RF terminations are soldered directly onto pc board which could very likely crack under the strain. With the length Parkman reports, four metres or so, you could get away with using something a bit more lossy, but ...

You'll have to try it to find out!

Using nor RF-amplification was to my recollection more due to the need to achieve wide bandwidth without the need to retune the receiver. Design of wideband preamplifier that could provide the necessary bandwidth and high IM to match the wide bandwidth of the above mentioned passive diode mixer was...

A 460.500 MHz dipole will have each side 6" long so there's no need to go buying anything. Silver solder brazing rod would be good for the elements at that scale, or just thick stiff copper wire if that is to hand.

Maintaining the TCXO at a constant temperature, so that its pushing and pulling with inevitable overshoots is kept to a minimum, would probably be the best course of action. Stick it in an oven to maintain standard temperature and pressure will likely produce greater stability than relying on its te...

You should be able to receive FM broadcast stations with almost no antenna at all. Why not, as an experiment, just connect a straight piece of wire 30" long (i.e. near enough a quarter-wavelength at 100 MHz) directly into your SDR RF input, and see where that gets you. When I do it with my Nongle N3...

I meant to ask you about that amplifier - do you know what its bandwidth is suposed to be?

SDRsharp Radio 4 94.5.JPG SDRsharp Radio 4 94.5.JPG OK, I have some ideas. 1. Using Nongle N3 SDR and SDRsharp I could locate my local UHF DTV siignals but they are too broad to be visualised properly with SDRsharp and Nongle N3. 2. Switching off AGC and setting mode at RAW in SDRsharp, tune across...