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AFSK 1200 Modem Based on PIC16c620 - Schematic Only__
Build a HamComm Data Slicer - Until recently many of the ham radio operating modes required specialist equipment that most often had to by build and was exclusive to the task. Enter the Personal Computer. The PC made life a little easier for the ham as it was now able to take over some of the jobs that bespoke hardware did. But it still wasn't quite there yet. The task of the PC was mainly to be a 'front end' to a now multi capable bespoke box__
Connect a Modem to a Basic Stamp - 09/16/99 EDN-Design Ideas - The 2400-bps modem in Figure 1 makes it easy to connect a Basic Stamp (Parallax Inc, www.parallaxinc.com) to a telephone modem. Using this circuit, you can call home via your PC and find out if the house is still there. The Basic Stamp2, BS2-IC, has the necessary programming space, and a 64-kbyte StampMEM memory-storage board enhances site data collection. Design by Ken Gracey
DSL Filter (phone-line) - The above diagram is a standard low-pass telephone line filter (L1, C1, L3, C2). L2 and L4 are needed since we're dealing with the 'Tip' and 'Ring' of a phone line which may carry up to 90VAC! __ Designed by Tony van Roon VA3AVR
E10-G RS232 Modem - How to connect a PC RS232 moden to you Pocket PC__ © Vassilis Serasidis
FSK Modem with PIC16C84 - schematic only __ Designed by shaunwilson19 @ yahoo.com
HAMCOM & SoundCard MODEM interface for digital modes using serial- or soundcard audio - Ham Radio - Modems and Soundcard interfaces - schematic __ Designed by Guy Roels ON6MU
HAMCOM (SSTV, RTTY, FAX, PSK31...) modem using PC-speaker for TX - Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX - Ham Radio - Schematic - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
HamComm Modem interface - I have recently done quite a lot of work on RTTY, using the HamComm program and been so impressed that I made a PCB to support the program. I think that I will continue to use the software, so I have registered it with the programs author: W. F. Schroeder, DL5YEC has obviosly put so much work into it. The program will send and receive RTTY up to 300 bauds as well as sending and receiving CW. I am very impressed with the programs ability to __ Designed by Harry Lythall-SM0VPO
KD2BD Pacsat Modem - The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface between a packet radio terminal node controller (TNC) and an amateur satellite ground station, and allows full-duplex access to the 1200 baud "Pacsat" constellation of amateur satellites. __ Designed by John A. Magliacane, KD2BD
Modem-access adapter reduces interference - EDN-Design Ideas - 07/22/1999 The modem-access adapter (MAA) in Figure 1 has features that reduce problems when modems and phones share the same line. The design also overcomes the shortcomings of modem interference protectors. Design by Thomas Schmidt
Null Modem cable 9-pin - Circuit only, no circuit description included. __ Designed by Tony van Roon VA3AVR
PTT and soundcard interface for the TM255/455 - Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
PTT and/or soundcard interface - Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU
Supervisory Monitors-modem connection - 04/09/98 EDN-Design Ideas - (Scroll to find this circuit) In telemetry or security applications in which a modem connection automatically establishes itself between two systems, a failure in one of the systems can interrupt the data exchange while the connection remains established until someone physically breaks the line or restarts the failed system. This situation Design by J Basilio Simies and Jorge Landeck, Instrumentation Center of the University of Coimbra, Coimbra, Portugal
The KD2BD Pacsat Modem - The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface between a packet radio terminal node controller (TNC) and an amateur satellite ground station, and allows full-duplex access to the 1200 baud "Pacsat" constellation of amateur satellites. __ Designed by John A. Magliacane, KD2BD
TM-441 9k6 packet Modification - Schematic only __ Designed by Guy Roels ON6MU |
