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Diamond X510N

Published by in Ham ·

During a storm in 2012 my Diamond X510N antenna support pipe was broken, the antenna was supported only on the N-connector and cable….

The antenna was dismounted and put away (horizontally) on the roof of my carport, this for several years…After give it some thoughts I decided to disassemble this antenna for restoration.

To handle this antenna during transportation it is split in 3 elements, each specific section have its own brass rods, coils or capacitors depending of its function in this double band antenna.

Before I did any disassembly of the elements itself, I measured accurately every length and thickness of all components, also all capacitors.

A big surprise came with disassemble this antenna, the top element was split in pieces…..also some nasty corrosion was visible. (Water leakage?)

I thought after reading some fairly positive reviews of this antenna that all radiated elements would be solid brass rods….instead of thin pipe… Should there be a reason why thin pipe is used instead of rods? Maybe to gain weight? Flexibility? I`m not sure here, probably cost effective?

To investigate all rod`s I used first a stereo magnifier (2X), and found evidence of rod #3 which was cracked, to speeding-up some things  I used a side cutter, ( using force of only 2 fingers), and found in total 3 thin tubes.

The connections between the coils and rods are done by a simple connector which is mechanical pressed to make contact, some room for improvement here…

Eventually I used some brass distance holders which I solder directly on the rods (on one side), the other side of the distance holder went treaded.
I bought some 3mm brass rods from a local company to replace the 3 thin pipes.

After all sections finished with new connections and new capacitors, I measured all lengths again and I put new foam on the sections and assembled the antenna.

Investigating  the “water leakage” , previous mentioned in this article, is due to the fact that the antenna was lying horizontally this for years on a roof….the antenna is made for vertically use.
I made sure that the holes next beside the connector went free from any obstacles…to drain any condensation.
Also some self-vulcanizing tape is used to water-resistant the brackets.

For the new support pipe I used some thicker material and reinforced the construction of the lock screw.

Before connecting the antenna to a transceiver I made some measurements with my earlier build vector network analyzer.
You have to consider, measuring directly on an antenna with this kind of equipment can kill it ! or even you …due to static energy ……
(The vna went calibrated with my 50ohm cal set)
On 192MHz this antenna is also resonant with specifications similar as on 144MHz.

Can this antenna be further optimized? maybe..., but that is not my goal for this moment, it is a dual band antenna and is performing fine for my needs.


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