Hassan -I read this QRZ question about the Hagenuk 500 HF Amplifier
I have the Bandpass Filter and PA protection removed from Hagenuk HF equipment,
that I acquired several years ago.
I am looking for a manual or circuit diagrams (schematics) in order to use or adapt
these parts for a DIY Build project.
I have sent inquiries to other amateurs, that have Hagenuk radios, but they have not yet replied.
If you can help, I would appreciate it.
all the best
From you photo, this bandpass filter has SIX distinct filters, that should match a 6 position Band Switch on the Hagenuk radio.
A picture of that Band Switch (front panel of the Hagenuk radio or amplifier) should tell you the HF frequency range (e.g. 14 - 15 MHz) for each selection.
This bandpass filter is RELAY Switched, you can see the Relays for each band section and a control / interface section one end of the board.
Did this come from a Hagenuk HF transceiver (100 watts RF output) or a Hagenuk HF amplifier (~500 watts RF Output) ??
Based on components, it looks like it came from a 100 watt HF transceiver.
IF you look at the HF Projects Low Pass Filter Board .. you will note the similarity to your Hagenuk board.
[i]In your board, Air Wound coils are used -- while the HF Projects board used coils wound on Torroid cores
That should help get you started.
You will need to determine the control / relay switching and RF IN/OUT ports.
73, greg - w9gb