Ham Radio Club Cologne - Hammerhead Project

[DB3JHF]

Hello everyone,

We're going to build five Hammerhead Rev D detectors as a group project in the Ham Radio Club Cologne. Almost all parts have arrived only the boards are missing (DIY by one of our members and will be ready in the next days). Additionally we designed a coil housing (to be printed with the 3D-printer) and other useful parts to built the detector.
We will add more infos and photos of our progress with the project here.
There are already some pictures of the 3D parts and the relevant files if somebody likes to use them: https://www.thingiverse.com/thing:2478864

[geoscash1]

This thread is a build blog that is unfinished but will be one of these days so please don't pollute it with off topic stuff or unrelated info.

Here is an idea, why don't you start your own thread in the hammerhead forum???....

Hello everyone,

We're going to build five Hammerhead Rev D detectors as a group project in the Ham Radio Club Cologne. Almost all parts have arrived only the boards are missing (DIY by one of our members and will be ready in the next days). Additionally we designed a coil housing (to be printed with the 3D-printer) and other useful parts to built the detector.
We will add more infos and photos of our progress with the project here.
There are already some pictures of the 3D parts and the relevant files if somebody likes to use them: https://www.thingiverse.com/thing:2478864

[Qiaozhi]

This thread is a build blog that is unfinished but will be one of these days so please don't pollute it with off topic stuff or unrelated info.

Here is an idea, why don't you start your own thread in the hammerhead forum???....

Good idea.
I have moved this project to its own thread called "Ham Radio Club Cologne - Hammerhead Project".

All the best with the project, and please make sure to keep us informed of progress.

[DB3JHF]

Thanks folks, sorry for getting it wrong with 'build blog'. So our experiences will be updated here.
As of today our kits are almost complete, still waiting for the PCBs...

[geoscash1]

No worries, its just makes it easier for everyone when searching for a particular subject or project instead of trying to remember where something was posted and searching forever...

Nice kit by the way...

Thanks folks, sorry for getting it wrong with 'build blog'. So our experiences will be updated here.
As of today our kits are almost complete, still waiting for the PCBs...

[6666]

Great 3D printer work.

[DB3JHF]

Thank you all very much for your answers and comments!

Here are some pictures of our first assembly:


We decided to design two different types: one with a single tube using a simple handle, another version with a two-tube design and optimized handle.
The rear end of the tube gives space for the batteries (8x C-Cell) for long power-on time and which also work as counter balance. The basic idea of this design is to give everybody the chance to change or add other (improved) parts which fit the personal needs.









Please feel free to post your impressions, comments and tips for improvement.

Jens, DB3JHF

[6666]

You have some good ideas there.

[DB3JHF]

PCBs have been delivered and the first one is ready for power-up and calibration !

[DB3JHF]

Power up was successful, we had to replace R53 with 22kOhms because we use -6Volt / +6Volt regulators instead of the -5 / +5 Volt regulators. We decided to do that for some more stability - the SA555 runs almost at minimum voltage with 5V. For diodes D1 and D2 we use BAT 42 (with low 0,33V forward voltage) instead of 1N4148.

[DB3JHF]

Here are some pictures of our first assembly. It is working fine (so far). We're testing another FET IRFP 640A (with lower internal resistance) as coil driver Q3. So the RX coil current is about 12% higher, but is tending to ring faster. We will see...

[kt315]

1/ foil will kill all sens
2/ why with this nice enclosure you do not do double field coil?

[DB3JHF]

We are going to use a second coil (for RX / Bucking). The photos were taken just at the early tests. We wanted to keep it simple and tried to reduce the amount of possible error causes - like a 2nd coil.

1/ foil will kill all sens
2/ why with this nice enclosure you do not do double field coil?

[6666]

What material did you make the orange coil former from and what did you use to glue it together ? thanks.

[DB3JHF]

The orange parts are all 3D printed PLA plastic. We use RTV silicone to fix them and to seal coils and connections. More pictures and the parts can be found at Thingiverse:
https://www.thingiverse.com/thing:2478864

We also designed a special to type battery pack / holder:
https://www.thingiverse.com/thing:2529149

What material did you make the orange coil former from and what did you use to glue it together ? thanks.