My Antennas and Filters
All photos are Copyright SM7GYT
 
 
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2x Aerial Oy AV1312-2, 144 - 174 MHz VHF

 

 




UHF

 

 




Procom CXL 70-8HD UHF and Aerial Oy AV1312-2 VHF

 

 



Allgon UHF 430 - 470 MHz

 

 




Military UHF 

 

 




Aerial Oy AV1915-H UHF 350 - 470 MHz and AV1312-2 VHF 144 - 174 MHz

 

 




Diskcone VHF

 

 




Wideband antenna, 66 - 88 MHz
Civil defence

 

 




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

 

 





Misc. antennas

 

 




Misc. antennas

 

 




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