Welcome to my Web site!
1. Dunedin Linear Repeater
2. Rotorua Linear Repeater
2a The Rotorua linear Repeater MK 2 rebuild
3. Coaxial Resonators
H.F. 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
V/U chinese tracking generator and Spectrum
33 chinese preamps off the web
34 29 MHz J Pole
35 new page
This page was last updated on 26-06-2020.
M.A.PINFOLD ZL1BTB firstname.lastname@example.org
Repeater Links try: http://www.repeater-builder.com
RF test equipment links http://www.rftest.co.nz/
Digital radio solutions http://www.4rf.com
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!!)