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.
Search found 21 matches
- Thu Mar 23, 2017 10:40 pm
- Forum: RTL-SDR Discussion
- Topic: local police/emergency?
- Replies: 2
- Views: 2578
- Sat Mar 18, 2017 12:15 am
- Forum: RTL-SDR Discussion
- Topic: Placement of LNA
- Replies: 19
- Views: 10705
Re: Placement of LNA
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...
- Thu Mar 16, 2017 1:15 pm
- Forum: RTL-SDR Discussion
- Topic: Placement of LNA
- Replies: 19
- Views: 10705
Re: Placement of LNA
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 ...
- Wed Mar 15, 2017 10:08 pm
- Forum: RTL-SDR Discussion
- Topic: Has cooling sticks <=0°C been tested (e.g. dry ice/freezer)?
- Replies: 7
- Views: 4596
Re: Has cooling sticks <=0°C been tested (e.g. dry ice/freez
You'll have to try it to find out! 

- Wed Mar 15, 2017 9:29 am
- Forum: RTL-SDR Discussion
- Topic: Placement of LNA
- Replies: 19
- Views: 10705
Re: Placement of LNA
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...
- Tue Mar 14, 2017 11:53 pm
- Forum: User Projects
- Topic: How to copy car key fob?
- Replies: 11
- Views: 12852
Re: How to copy car key fob?
Law and order approaches often differ from jurisdiction to jurisdiction, and from nation to nation.
- Tue Mar 14, 2017 11:51 pm
- Forum: Antennas
- Topic: Shortwave reception (SDR)
- Replies: 3
- Views: 4993
Re: Shortwave reception (SDR)
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.
- Tue Mar 14, 2017 11:39 pm
- Forum: RTL-SDR Discussion
- Topic: Has cooling sticks <=0°C been tested (e.g. dry ice/freezer)?
- Replies: 7
- Views: 4596
Re: Has cooling sticks <=0°C been tested (e.g. dry ice/freez
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...
- Mon Mar 13, 2017 12:41 am
- Forum: RTL-SDR Discussion
- Topic: Digital TV
- Replies: 9
- Views: 6830
Re: Digital TV
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...
- Sun Mar 12, 2017 11:44 pm
- Forum: RTL-SDR Discussion
- Topic: Digital TV
- Replies: 9
- Views: 6830
Re: Digital TV
I meant to ask you about that amplifier - do you know what its bandwidth is suposed to be?