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Welcome to my Web site!
M.A.Pinfold ZL1BTB
mapinfold@yahoo.com
1.
Dunedin
Linear Repeater
2.
Rotorua
Linear Repeater
2a The Rotorua linear Repeater MK 2 rebuild
3.
Coaxial
Resonators
4.
Codan HF SSB Repeater Project
4a DUPLEXER
FOR HF REPEATER
5.
Contemporaneous
On-Frequency Repeater (not the Plessey patent)
6
The Plessey Avionics
PTR3411 Contemporaneous FM
repeater!!
7
Common
Channel communications
8
Direct Conversion FM
Receivers.
8.
Circulators
(under construction )
9
Long
Range Bluetooth Data Transfer
10
Jamming Enforcement Doppler radar
a few thoughts!
11
Reciprocating
detector For SSB /DSB/ CW
12
Second
generation reciprocating detector
13 The Synchronous Oscillator
13A
Frequency Demodulation assisted by Synchronous oscillator
14
Common Rail Diesel injector interference Isuzu
bighorn
updated nov
2013
15
Superregenerative detector operating
at H.F
16
Half
Wave Dipole Resonants Lengths @ H,F
17
A
Remote Controlled HF Communications
Receiver via DTMF ,
ICom IC-R75.
18
A motorcycle mounted 2m dipole antenna
19
Digital Radio Mondiale convertor 455 to 12 Khz
20 Double Sideband suppressed carrier
demodulation , MC1496 as squaring means
21
DSSC demodulation by the
squaring means diode doubler technique
22
simple narrow filters
23 Double sideband demodulator mk3
squaring loop
24 NE567 Tone
Decoder as AM FM demodulator at 455 KHz
25
29 MHz Coaxial resonator
for the 10m Band
26
Quartz crystals Where to purchase
inexpensive
27
Mini Circuits Low Pass
filters .... SMD
28
9:1 un-un for HF receive only
29
The SA828 UHF Transceiver Module
30
Measuring second harmonic level via
notching the fundamental frequency
31
NE567 AS AN EFFECTIVE RECEIVER MUTE
32
V/U chinese tracking generator and Spectrum
analyser
33
Chinese preamps off the
web
34
29 MHz J Pole
35
Super regenerative receivers , quench investigation
36
Amplitude
modulation of 2.5 GHz WBFM systems
37. Tuning
a ferrite Circulator
38.
H.F Antenna
for RV Vehicle
39.
R.F
splitters and combiners (3dB) for H.F.
40.
Watchdog Timer for BYONICS Tiny Trak 4
41 R.F
splitters rf
splitters.combiners.htmand combiners (3dB) for H.F
This page was last updated on
28-02-2024.
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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