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Welcome to my Web site!
M.A.Pinfold ZL1BTB
mapinfold@yahoo.com
Dunedin
Linear Repeater
Rotorua
Linear Repeater
The Rotorua linear Repeater MK 2 rebuild
Coaxial
Resonators
Codan HF SSB Repeater Project
DUPLEXER
FOR HF REPEATER
Contemporaneous
On-Frequency Repeater (not the Plessey patent)
The Plessey Avionics
PTR3411 Contemporaneous FM
repeater!!
Common
Channel communications
Direct Conversion FM
Receivers.
Circulators
(under construction )
Long
Range Bluetooth Data Transfer
Jamming Enforcement Doppler radar
a few thoughts!
Reciprocating
detector For SSB /DSB/ CW
Second
generation reciprocating detector
The Synchronous Oscillator
Frequency Demodulation assisted by Synchronous oscillator
Common Rail Diesel injector interference Isuzu
bighorn
updated nov
2013
Superregenerative detector operating
at H.F
Half
Wave Dipole Resonants Lengths @ H,F
A
Remote Controlled HF Communications
Receiver via DTMF ,
ICom IC-R75.
A motorcycle mounted 2m dipole antenna
Digital Radio Mondiale convertor 455 to 12 Khz
Double Sideband suppressed carrier
demodulation , MC1496 as squaring means
DSSC demodulation by the
squaring means diode doubler technique
simple narrow filters
Double sideband demodulator mk3
squaring loop
NE567 Tone
Decoder as AM FM demodulator at 455 KHz
29 MHz Coaxial resonator
for the 10m Band
Quartz crystals Where to purchase
inexpensive
Mini Circuits Low Pass
filters .... SMD
9:1 un-un for HF receive only
The SA828 UHF Transceiver Module
Measuring second harmonic level via
notching the fundamental frequency
NE567 AS AN EFFECTIVE RECEIVER MUTE
V/U chinese tracking generator and Spectrum
analyser
Chinese preamps off the
web
29 MHz J Pole
Super regenerative receivers , quench investigation
Amplitude
modulation of 2.5 GHz WBFM systems
Tuning
a ferrite Circulator
H.F Antenna
for RV Vehicle
R.F
splitters and combiners (3dB) for H.F.
Watchdog Timer for BYONICS Tiny Trak 4
\KIWISDR
Mk 2. serial No. 001
Choke
for H.F.
3dB
splitters and combiners for HF
Xiegu G90 Tuning Problems
This page was last updated on
01-12-2024.
M.A.PINFOLD ZL1BTB
Repeater Links try:
http://www.repeater-builder.com
RF test equipment links http://www.rftest.co.nz/
Digital radio solutions http://www.4rf.com
click below
Check out
my other site
that pays the bills to enable this site to
exist! 2.4 GHz video
cameras video senders, receivers , 802.11b Wireless Lans, Motorcycle intercom
radios, 2.4 GHz antennas bone conduction mics, Vox units etc.......all in
$NZ (much less
than $US!!)
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