hi adam,
> i am adam/bd6cr from shanghai china. i have made a tinytrak
> according to your instructions on
>
http://www.dk7in.de/tinytrak_e.html. it can talk to configuration
> program. since i don't have gps receiver currently, i use a
> at89c2051 to simulate gps. i configure at89c2051 into 4800baud 8n1,
> and continuously send gprmc and gpgga sentences. these sentences
my version of tinytrak only uses the gprmc sentence. position, speed,
direction and the valid flag information is used.
> are all same, without any change in utc time. now i can't observe
> 1200/2200hz on tinytrak, i wonder whether the gps simulator can
> work with tinytrak, can you give me some idea? thank you.
you can force an aprs packet to be sent by closing the switch for
manual beacons on pin 11 of the pic for a second or two and then
release it. even without valid gps data this produces the modem tones
but with a message "no gps".
you should see if valid gps data is available on the yellow gps led.
normally the led is off with no gps data, blinking with invalid gps
data (during satellite aquisition) and on if valid gps data is
received. maybe you have no valid flag in your gprmc stream?
i have two hex files in the zip archive, with the 'r' version the
function of this led is inverted.
73 de rolf
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按照这个网页制作成功了tinytrak1.6，含smart beacon的部分功能。
其中，单片机使用pic16f84a-04/p，4m的，使用10m晶体，配合两个20p电容，单片机配置为hs振荡模式，禁止watchdog。
这个单片机程序还支持调试功能，在标准终端程序下输入esc t0/1/m可产生1200hz 2200hz mixed多种信号，已经通过测试。
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