100mW - VHF- 2M - TX

Low power compact and light weight VHF 2M TX .
The output power =100mw@.5VDC.
Apart from a couple of  Hertz drifting on start-up.
I was impressed with the frequency stability.
In testing I found it easy to forget that this TX is just  pro-type module !.
Stability led me to connected  my sound-card with UISS beacon on !.
On other side of the bound  (ie cross the workbench) I've copied every single beacon frames.
Did I hit the ISS with this low power ?? GOK.
Next pass,I'll try to hook it to the Yagi :-))

 

Baycom Modem !

A simple modem that functions the same as the classic "dumb" Baycom Modem.
For modulation a monolithic phase-locked loop (PLL) IC xr2211 used.
The demodulation  XR-2206  a monolithic function generator was used .
Calibrate the Mark tone 1200Hz at low TXDATA level , and
the space @ 2200Hz at high TXDATA .
Why do I need to build such an old style modem ?
1st because it a piece of the digital communication history .
2nd its a very good demo tool for the digital modulation topics.

STRaND-1 Received with Kantronic 9612 Plus and IC-910.

16:23  16:37   UTC

Orbit # 72

STRaND-1 Received with Kantronic 9612 Plus and IC-910.

Setup steps:

1st put the TNC in KISS mode.

Start Hyperterminal

 Select TNC Port # and other setting 9600,N,8,1.

 @ CMD type 

|2b to switch to 9600 port.

Intface kiss.

Reset.

Disconnect the Hyper-terminal .

Start OnlineKiss v8.4.0

Select TNC Port # and other setting 9600,N,8,1.

Rig with Doppler correction.

Remember to turn the 9600 bps data transmission on. 

Track and receive.

 I use the  previous OnlineKiss  version 8.2.2 to exit the KISS mode by

click (Set TNC in CMD mode ) bottom.

after the pass,  kissfile created at OnlineKiss.exe dir.

Use Kissdump or other decoder to display a KISS Files

OnlineKiss v.8.4.0 (the latest version ) works fine with Kantronics 9612 plus .

STRaND1 MODEM BEACON - Help me OBC Kenobi.
C0 10 DB DC 80 61 06 01 E0 00 00 07 26 C0
C0 10 01 E1 00 00 00 06 C0
C0 10 01 E3 00 00 00 00 C0
C0 10 01 E2 00 00 29 35 C0
C0 10 01 E4 00 00 00 00 C0
C0 10 DB DC 80 63 06 01 E0 00 00 07 26 C0
C0 10 01 E1 00 00 00 06 C0
C0 10 01 E3 00 00 00 00 C0
C0 10 01 E2 00 00 29 3D C0
C0 10 01 E4 00 00 00 00 C0
C0 10 DB DC 80 64 2E DB DC 53 54 52 61 4E 44 31 20 4D 4F 44
45 4D 20 42 45 41 43 4F 4E 20 2D 20 48 65 6C 70 20 6D 65 20
4F 42 43 20 4B 65 6E 6F 62 69 0D 0A DB DC 00 C0
MODEM BEACON - Help me OBC Kenobi..

Boot loader

MY HOMEBREW PIC TNC.

In 2005 Bob Ball published an article in QEX magazine about a modem-less TNC using a PIC microcontroller.Here is my version.