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N4XI X1W-2 Kit 
The 1-Wire outdoor humidity and temperature sensor kit was designed
to be used with the TAPR
T-238 APRS Weather Station or N4XI's
Linux based WXN weather server over APRS. It should work with any
other 1-Wire¨ based software as the design is based on the original
Dallas Semiconductor 1-Wire¨ Weather station. The humidity sensor with
the kit is an improved version over the original part. It has proven
stable with good accuracy over a wide range of temperatures and
conditions. The design is flexible in that power for the sensors can
be taken directly off the 1-Wire bus or from an external power source.
... Read more
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TAPR PIC-Encoder  The TAPR PIC-Encoder (PIC-E) is a general-purpose
packet radio encoder based on the Microchip, Inc.
PIC16F84 PIC microcontroller. The PIC-E was
designed to provide a generic interface between the
digital world (in the form of serial data streams) and
the amateur packet radio world (in the form of AX.25
packets) and is fully programmable by the user. For
example, the user can program the PIC
microcontroller to take serial data from a GPS receiver
or weather station and transmit it as formatted packet
frames. Virtually any data that can be provided to
the device as a serial input stream can be reformatted
and transmitted as 1200 bps packet radio... Read more
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N4XI X1W-4 Kit 
The EMP sensor kit was developed as a cost effective alternative to more expensive lightning detectors on the market. . Compared with commercial sensors, this unit is more sensitive, and allows repairs using readily available parts. Designed to be used with the X1W-1 or X1W-2 EMP interface, the output is fed to a simple 1-Wire counter which is then read by the system periodically.
. ... Read more
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TAPR VNA
The TAPR Vector Network Analyzer is a low-cost Vector Network Analyzer (VNA) that operates
from 200 kHz to 100 MHz, and connects to a personal computer using a USB
1.1 interface.
The VNA is one of the more useful pieces of test equipment for
designers and experimenters. The VNA allows measuring the forward and
reverse gain and phase response of a circuit, and the input and output
reflection properties (complex impedance). The VNA is used to measure
and adjust filters, coaxial cables, amplifiers, antenna input impedance
vs. frequency, just to name a few... Read more
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Atlas Backplane 
The Atlas back plane is the foundation for the HPSDR radio system. Read more
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DSPx DSP Module  The DSPx is a fully wired and tested Digital Signal Processing (DSP) Module
suitable for DSP development and learning, as well as embedding into your own
projects.
The DSPx is fully compatible with the W7PUA DSP-10 2-meter Software Defined Radio... Read more
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Compact Flash Adapter 
An updated interface board has been developed which allows CompactFlash
cards (Type I & II) or a IBM Microdrive™ to be used as a boot devices on a PC. It takes advantage of the "true IDE" mode of a CompactFlash™ Card that allows it to operate
as a true IDE hard disk drive. The original CompactFlash Adapter (Type I) was developed in 1997 to fill a need for a rugged boot disk, that networkers could use to run NOS or some other network node software... Read more
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DTMF Accessory Squelch 
The DAS (DTMF Accessory Squelch) acts like a switch connected in
series between the speaker output of your VHF or UHF transceiver
and an external speaker. DAS will monitor a radio channel for
you, with the speaker switch open so the speaker remains silent,
until someone sends one of the DTMF sequences you have selected.
When DAS hears your personal Touch-Tone ID sequence on the
radio channel it will light a LED, sound an buzzer and close the
series speaker switch so that you can hear the audio of the
calling station... Read more
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T238+Modem2 WX STN 
The T-238+ is a general-purpose Motorola MC68HC908GP32 microcontroller-based board intended for use with the Dallas Semiconductor 1-Wire(tm) bus and any device that needs a serial connection. The T238+ has been pre-programmed to interface with a Dallas Semiconductor 1-Wire Weather Station. Weather data is displayed on an LCD display and transmitted via the piggyback modem in APRS formatted weather packets. The T238+ can also be interface to a computer for data logging.
... Read more
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TNC-2 DCD Upgrades 
Proper operation of Data Carrier Detect
(DCD) is imperative for efficient sharing of a packet
channel. Many TNC's don't provide optimum DCD operation,
and version 2.0 of the AX.25 Level 2 protocol compounds
the problem. However, an inexpensive solution is now
available to combat the former case and progress is being
made in the latter case with proposed changes to AX.25
Level 2 Version 2.1. The TAPR DCD kits
were designed to make it a trivial matter to upgrade most
TNCs to improved DCD operation with the addition of a
simple board. These mods are extremely useful for both
VHF and HF operations... Read more
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PK-232 Upgrade Kits 
This kit is a simple PC board assembly you can build in an
evening and still have time left to operate your radio!
Once completed, it simply plugs into an IC socket inside
the PK232 and provides you with a 'Standard' TAPR modem
disconnect header. This header provides a convenient
place to connect the DCD State Machine upgrade kit, the TAPR 9600bps modem, PSK modem, or other items that need this connection. The result is a no-holes enhancement of
your PK-232 (or Heath HK-232)... Read more
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