The All-band HF Amateur Radio Transceiver: Just waiting to be modified
Brad N8YG has been reading over posts concerning the ssm2167 compression pre-amplifier with quite a bit of interest. So he finally integrated the board into his ubitx v5. He put a trimmer on the output of the board, and potentiometers on the compression, and noise gates. The problem that he ran into was that on …
Continue reading “SSM2167 board – improving compression control”
John VK2ETA some time ago provided information about his experiments with the SSM2167 module available on eBay.com and Aliexpress.com for a few dollars. The following shows the wire up diagram: Picture of 4 pin molex connector added to the V3 Raduino for pickup of T/R (D7), +5V, I2C SDA, I2C SLD. Note that the Arduino …
John VK2ETA notes that Simon, VK3ELH, pointed out an issue that when inserting an SSM2167 mic compressor circuit between the microphone and the uBitx mic-preamp, it can create feedback when the microphone was placed near the speaker while in RX. This is because the SSM2167 module is always on. The solution John has applied is to …
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John, VK2ETA, has used the small circuit board “SSM2167 Microphone Preamplifier Board Preamp COMP Compression Module DC 3V-5V”available on eBay or Aliexpress as a compression and mic pre-amplifier. He simply connected the input to the mic, added a 4.7K ohm resistor between the mic input and the 5VDC (taken from the Raduino) for biasing the …
Continue reading “Mic Compression and Noise gate with SSM2167 module”
Lee “I Void Warranties” N9LO ran across this circuit when looking for a transmit indicator for his Small Wonder Lab PSK31. [Note the circuit was originally drawn incorrectly, but has now been updated] Lee threw it together (there are not many parts) and it lights up bright and solid for CW and you an watch your modulation …
Nick VK4PLN has been working on a new board that will give a few extra features to a stock uBitx and plugs into the audio loom socket. Its an Audio board providing easy access to Audio I/O pins. (add in your own AGC board, External amplifier…) It includes an area for adding an SSM2167 Mic Pre-amp …
Continue reading “Another board from Nik VK4PLN that does several things at once”
John VK2ETA has uploaded an updated folder to the BITX20 IO Group list files section. This adds new schematics for his Antenna Tuning Unit (ATU). ATU Design objective 1. Fits in the limited space of my Jameco case (Jaycar case here in Oz), on my second level board. 2. Tunes long wire and EFHW (worst …
Continue reading “VK2ETA automatic L-match using separate arduino nano”
John VK2ETA has some pretty good ideas. A few days ago he worked on an AGC system using the first IF stage (at 45MHz) to control gain at the front end of the system. He has now got some pretty good results using a limited amount of memory in the firmware to flatten out the …
Continue reading “Flatten the power curve and set your power out in software”
There are a number of very talented people involved in modding the µBITx. A number of BITX20 IO group members have mods under way that we can look forward to hearing reports on in due course. This news item provides a bit of a round up of what’s in store for the µBITx constructor community. …
UBITX.NET RECOMMENDS YOU CONSIDER INCREASING MIC GAIN BY CHANGING COMPONENTS OR ADD A MIC COMPRESSION MODULE Why increase Mic gain or add compression? Mic gain is barely adequate on the µBITx and there is no Mic Gain control (only a drive control that impacts on both phone and CW). Given this is a QRP rig, …
Continue reading “Mod: Add Mic Pre-amp Gain and/or Compression”