|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Comrod wideband antenna 66-88
MHz
Civil defence
|
|
|
|
|
|
|
|
Military
Diskcone Antenna 30 - 80 MHz
|
|
|
|
|
|
|
|
Coaxial
Dipole
Coverage: 50 - 52 MHz
Rebuilt from a Procom VHF antenna
|
|
|
|
|
|
|
|
Coaxial
Dipole
Coverage: 50 - 52 MHz, SWR < 1.5:1
Rebuilt from a Procom VHF antenna
Choke Balun by 3 turns of the RG213 coax
The mounting gap is made by a wood pole
|
|
|
|
|
|
|
|
Coaxial
Dipole
Length calculations
|
|
|
|
|
|
|
|
Allgon wideband antenna 68-88 MHz
|
|
|
|
|
|
|
|
Allgon wideband antenna 68-88 MHz
SWR Curve
|
|
|
|
|
|
|
|
Allgon
GP Antenna 78/79 MHz
|
|
|
|
|
|
|
|
Allgon
dipole antenna 70 MHz
|
|
|
|
|
|
|
|
Allgon
folded dipole antenna 85 MHz
|
|
|
|
|
|
|
|
Diamond
X300, 145/434 MHz
|
|
|
|
|
|
|
|
Wideband
Shortwave antenna
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Bandpass-filter 4 Meter
Adjustable for 66-88 MHz
|
|
|
|
|
|
|
|
Bandpass filter UHF
Adjustable for 430 - 470 MHz
-10 dB @ + - 2 MHz
|
|
|
|
|
|
|
|
Autophon Duplex Filters UHF
Adjustable for 430 - 470 MHz
|
|
|
|
|
|
|
|
|
Bandpass filter 66 - 88 MHz
The shorter filters are rebuilt for 145 MHz
|
|
|
|
|
|
|
|
|
|
|
|
Duplex filters 432/434 MHz
BpBr Wacom 678-R2
Mod. for 2 MHz offset
Typical performance: 1.0 dBm loss and < -80 dBm notch
|
|
|
|
|
|
|
|
Duplex filters 434 MHz
Left: Wacom Bandpass/Bandreject, rebuilt for 2 MHz
Right: BpBr, Rebuilt from 4 meter Bandpass Filters,
Insertion loss: 1.0 dBm
|
|
|
|
|
|
|
|
BpBr
Filter 434 MHz
Rebuilt from 4 meter Bandpass Filter
Coupling loop and adjustable piston Capacitor
|
|
|
|
|
|
|
|
BpBr
Filter 434 MHz
-30 dB Notch @ - 2 MHz
|
|
|
|
|
|
|
|
BpBr
Filter 434 MHz
Homebuilt
|
|
|
|
|
|
|
|
BpBr
Filter 434 MHz
Homebuilt
|
|
|
|
|
|
|
|
Bandpass
Filter CFB 1045
400 - 470 MHz
|
|
|
|
|
|
|
|
Bandpass
Filter CFB 1045
Mod for BpBr 434 MHz
|
|
|
|
|
|
|
|
Bandpass
Filter CFB 1045
Coupling Loop for BpBr 434 MHz
|
|
|
|
|
|
|
|
Bandpass
Filter Kathrein, Type K 651221
420 - 470 MHz
|
|
|
|
|
|
|
|
Bandpass
Filter Kathrein, Type K 651221
Center freq: 434 MHz
Hor: 5 MHz/div, Vert: 10dB/div
|
|
|
|
|
|
|
|
Filter
setup for 434 MHz Repeater
Three filters on TX side and three filters on RX side
Single antenna
|
|
|
|
|
|
|
|
Bandpass filter 145 MHz
Rebuilt from a 66-88 MHz filter
|
|
|
|
|
|
|
|
Bandpass filter 145 MHz
Coupling Loops
|
|
|
|
|
|
|
|
Bandpass filter 145 MHz
Adjusting a filter with Sweep Generator and Spectrum Analyzer
|
|
|
|
|
|
