From 221e4d85465bca637dc4d1322238880ac30d68c7 Mon Sep 17 00:00:00 2001 From: drowe67 Date: Wed, 28 Oct 2015 20:11:01 +0000 Subject: [PATCH] latest notes git-svn-id: https://svn.code.sf.net/p/freetel/code@2477 01035d8c-6547-0410-b346-abe4f91aad63 --- sm2000/doc/sm202 Task List.txt | 63 +++++++++++++++++++++++++++++++++- 1 file changed, 62 insertions(+), 1 deletion(-) diff --git a/sm2000/doc/sm202 Task List.txt b/sm2000/doc/sm202 Task List.txt index a87fa87b..fe42668c 100644 --- a/sm2000/doc/sm202 Task List.txt +++ b/sm2000/doc/sm202 Task List.txt @@ -32,7 +32,24 @@ [ ] MDS (1200Hz) -135dBm, [ ] Tx phase noise -124dBc/Hz ?? + +[ ] Design + [ ] LNA selected with RF switch + [ ] switchable power as well + + as power consumption is so high + [ ] AGC in rx to facilitate SSB operation + + a control line from uC DAV/PWM? + + pump up/down GPIO + [ ] LO buffer that can be bypassed by DNL + [ ] put extra 0805/603 compons in parallel for Z matchhing and dnl + + e.g. on collectors and emitters of RF amps + [ ] Parts Selection + [ ] what constitutes a RFC? + + recc general part + + current consumption + + RF characterisistics + + e.g. for PGA 103 and RF amps [ ] New audio amp chip + bit better, higher power than LM386 [ ] should we add a LCD? @@ -111,4 +128,48 @@ [ ] where do we put sheilds [ ] how to fabricate? [ ] foot prints - + [ ] probe points + + VHF freindly with nearby grounds + + something I can sit a CRO probe in, with short ground, like 2 thru hole donuts + + 1k series resistor to 50 ohm points so we can probe with 50 ohm spec-an or scope + + can we get a 50-ohm probe for cro or spec-an? + So mechanically it can sit on board? + [ ] 50 ohm points for spec an? + [ ] ways to disconnect modules so we can insert tracking gen and spec an + + 0805 0 ohm jumpers + +[ ] Manufacture + [ ] is it feasible to have 6 turn coils with one turn taps in production? + + what are the alternatives + [ ] can people wind toroids? + [ ] How will we test and align? + +Unorg notes +----------- + +What we care about: + ++ Software defined waveform (even linear ones like PSK), so must be + linear up and down conversion, eg. direct FM is out ++ TDMA so needs a uC with bare metal, no USB and Host PC type devices due + to latenecies ++ Functional demos of advanced features ++ Your idea is you are willing to roll up you sleaves and make it happen. + +What we don't care about: + +Other people are good the aspects below, we are not. So we focus +where we can make a difference, like innovateive coding, good modems, +a new codec, and open source. We are doing enough! Don't have to +a tick all boxes first time around. + ++ minimal cost ++ your favourite radio architecture - there are many ways to up and down convert a signal. ++ High RF performance, such as phase noise, blocking, ACR, high tx + power, multi-band operation, low spurious, component selection, low + power consumption. ++ Your favourite chipset ++ Your idea unless you are willing to roll up you sleeves and make it + happen. ++ gold plating - is the feature you are proposing going to add to our + schedule? Will it introduce risk? -- 2.25.1