FrankinAu

Comments

• Can you point to a circuit using the USB port UART to switch antennas I'm guessing a Arduino sounds what I'm looking for

  in Antenna switching using IO lines under Web GIU Kiwi SDR Comment by FrankinAu August 18
• Thanks for the reply can you pleae give me example say using Arduino, USB, and relay drivers im guessing a Arduino nano has enough IO lines any examples of a circiit and sketch I assume the Beaglebone board will support USB com port

  in Antenna switching using IO lines under Web GIU Kiwi SDR Comment by FrankinAu August 14
• Notice DRM is showing under 3dB signal to noise ratio in DRM box despite got around 20dB above noise on spectrum display

  in v1.811 Comment by FrankinAu June 1
• https://forum.kiwisdr.com/uploads/532/C1LP8UTYRNOU.png Away from VDSL2 noise spectrum picking up VLF NWC 20dB above the noise and very clean eye diagram, interesting monitoting FT8 on 18104 above VDSL2 noise much better than FT8 on 14.074 s/n figure…

  in VDSL2 interference what options have I got Comment by FrankinAu May 17
• I might hook up 5 port switch a battery use laptop and turn off power to the house, how much is from my telephone cabling inside my property, also read a guy in the UK used a current probe and QRM reducer to null out his VDSL2 QRM, early days yet…

  in VDSL2 interference what options have I got Comment by FrankinAu May 13
• What I ended up doing: mains RFI filter 250VA 15 volt 7.5 tap transformer 40kuF filtering 2 of 2N355 & LM317 regulator circuit good for 5 volts & 10 amps easy , weighs couple of Kgs with metal case heatsink and heavy transformer, my next pr…

  in Quiet switch mode power supply (SMPS) for KiwiSDR Comment by FrankinAu January 19
• https://forum.kiwisdr.com/index.php?p=/discussion/comment/19592#Comment_19592 Cant go wrong with old school linear power supplies, im now crying I thrown in the dumpster old computer bits with 5 amp 5 volt power supplies a few years ago thinking why…

  in Quiet switch mode power supply (SMPS) for KiwiSDR Comment by FrankinAu January 12
• Codan Selcall Telcall based on 4/3 7 bit 100baud 170hz FSK, very much used in Au with 4 wheel drive remote travel nets, some also do GPS position beacons & short text messaging

  in New discovery: Source of Selcall signals at 7.1 and 8.0 MHz in Region 3 Comment by FrankinAu May 2024
• I use a 7.5-0-7.5 volt center tapped 100VA transformer rectifier 20,000uF filtering & linear regulator 7805+ 2 power transistors good for 5 amps & 5 volts, with RFI mains filter all in a metal box containing KIwiSDR unit and RF filtered eth…

  in My power supply setup Comment by FrankinAu May 2024