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cameronl : radio   45

AN098 - Layout Review Techniques for Low Power RF Designs - swra367a.pdf | ti.com
- CC1101, CC430, etc. SmartRF
- "TI LPRF reference designs are...recommended to be copied exactly"
- "Impedance matching is critical"
- "how to include a test/debug port in the prototype design for easy and quick radio performance testing."
radio  rf  design  pcb  layout  electronics 
october 2017 by cameronl
Michael Ossmann: Simple RF Circuit Design - YouTube
5 rules for RF PCB design:
1. 4 Layer PCB (consistent stack)
2. IC's whenever possible (filter, balun, transceiver, etc.)
3. 50 Ohm everywhere (use a calculator)
4. Follow manufacturer recommendations
5. Trace RF first
radio  rf  electronics  design  pcb 
november 2016 by cameronl
CC1101 RF module tests with arduino logic level converters PART1 (Ben Biles) - YouTube
cc1101, SPI, Logic level converter (5v to 3.3v), Gqrx, tv dongle, SDR (software defined radio), arduino clone
sdr  software  radio  rf  wireless  hardware  electronics  arduino 
august 2015 by cameronl
Measuring relative antenna performance -- Modding junk 900 Mhz antenna - Page 2 - RC Groups
"Anyone know where to buy a cheap 900Mhz SWR meter?

- Using the RSSI output on your A/V Rx is a very effective solution for measuring relative antenna performance as you optimize the element length at the Tx. Won't cost you a dime either."
wireless  rf  radio  antenna  design 
july 2015 by cameronl
1:1 SWR - Google Search
Understanding SWR by Example :: Take the mystery and mystique out of standing wave ratio.
http://www.arrl.org/files/file/Technology/tis/info/pdf/q1106037.pdf
wireless  rf  radio  antenna  design 
july 2015 by cameronl
433Mhz range | AVR Freaks
^"if you don't know the impedance a slim jim antenna would be a good start.(just google)"

Slim Jim and J-Pole calculator
http://www.m0ukd.com/calculators/slim-jim-and-j-pole-calculator/

Good resource - Slim Jim antenna
http://www.hamuniverse.com/slimjim.html

"Slim Jim Antenna delivers up to 6dbi of gain on the 440 – 470 Mhz UHF bands, which is almost twice the gain of a J-Pole and 5 times the gain of a 1/4 wave ground-plane antenna."
http://www.jpole-antenna.com/shop/uhf-440-470-mhz-slim-jim-antenna/
wireless  rf  radio  antenna  design 
july 2015 by cameronl
SmartRF Studio (Texas Instruments) - Google Search
"SmartRF™ Studio is a Windows application that can be used to evaluate and configure Low Power RF-ICs from Texas Instruments."
wireless  rf  radio  design  software 
july 2015 by cameronl
New schemas on top of SWAP - Post #37 - panstamp.org/forum
"RE: New schemas on top of SWAP
just a few thoughts about the ack/nak:

there are simple cases like
- sending a command to a mote. this is handle by the mote sending its status back.
-> no need for an ack/nak
- a sensor sending measurements more or less often:
in most cases the design can be that values are send often enough or instead if increments totals are send.
-> no need for an ack/nak
- for non battery boards the master can request device new values if a mote has not send values for some time
-> no need for an ack/nak and much simpler code in the mote
- the master has anyway to have some sort of 'dead' mote detection in case the battery runs out before a last message can be send

- 'security' sensors like door or windows sensors. i think these are the only ones that really need a sort of ack/nak."
wireless  radio  panstamp  microcontroller  swap  tcp  error 
june 2015 by cameronl
PIC project, using cheap RF modules! - romanblack.com/RF/cheapRFmodules
^ Lots of detail.

http://www.avrfreaks.net/comment/1135851#comment-1135851
"You need a "solid" ground plane to match it.
You can buy antennas or make them your self.
Look what HAM people do for the 70cm band.
I don't know where you live but there a rules about max effect and about % of the time you can be on the air (something like 2% of the time and never more than 30 sec on one transmit).
Add
and there are a big difference between 9600 baud and a <100 baud garage opener (ook like Morse code)."
rf  radio  microcontroller  antenna 
june 2015 by cameronl
XBee Buying Guide - SparkFun Electronics
XBee modules
XBee Series 1 (also called XBee 802.15.4) vs Series 2, ZB, etc.., Antennas, Regular vs Pro, 900MHz vs 2.4GHz
xbee  zigbee  wireless  radio  hardware  arduino  mesh  network 
march 2014 by cameronl
Western Intertie Network, or the WIN System
The WIN System is a series of 71 linked, or Intertied repeaters, most are 440, or UHF repeaters..
ham  radio  amatuer  network 
march 2012 by cameronl
HSMM-MESH
HSMM-MESH™ is a high speed, self discovering, self configuring, fault tolerant, wireless computer network that can run for days from a fully charged car battery, or indefinitely with the addition of a modest solar array. The focus is on emergency communications.
In its current form it is built using the Linksys WRT54GL wireless router.
wifi  mesh  maker  ham  radio  network 
february 2012 by cameronl
OSCAR Satellite Status page by KD5QGR
This web page was created to give a single global reference point for all users in the Amateur Satellite Service to show the most up-to-date status of all satellites as actually reported in real time by users around the world. Please help others and keep it current every time you access a bird.
ham  radio  amateur  satellite  status 
august 2011 by cameronl
Winrad.org
Winrad is a free amateur radio program conceived by Jeffrey Pawlan, WA6KBL, that implements many Software Defined Radio (SDR) functions which are needed for weaksignal reception... It also works well for general HF reception.
radio  software  computer 
august 2011 by cameronl

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