Tag: kelvedon hatch

Operating GB0SNB special event call from the Kelvedon Hatch SNB

On Saturday I operated from the Kelvedon Hatch Secret Nuclear Bunker near Ongar. The bunker is a large 3 level underground site, with a 50 meter mast on the roof. The bunker was active until 1994.

The bunker has a permanent special call sign GB0SNB and is open to the public as a museum.

Working with George M1GEO we completed some QSO on 5 MHz, 14 MHz and some VHF contact on 145 MHz.

You can read more about the bunker online, and if you’re local why not plan a visit. The current owner Mike Parish gives you a virtual video tour below.

The Icom 7100 provided HF and VHF. To the left is the TYT MD380 and right Icom E92

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Operating is completed from the original home office radio room, although this equipment is on the back wall its only for show.

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Here you can see George M1GEO tinkering with the IP and the co-located GB7KH DSTAR repeater.

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GB0SNB – Kelvedon Hatch Secret Nuclear Bunker.

Spent some time this weekend operating from the Secret Nuclear Bunker at Kelvedon with George M1GEO. The bunker has a permanent special call GB0SNB and we put this on the air both VHF and HF today. It was nice to see 7 MHz in good shape, full with the JOTA and WAG contest.

Here are a few pictures from the day.

More information on the bunker is available at the GB0SNB website.

Here is George M1GEO maintaining the GB7KH repeater.

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Ever wondered what the inside of a DSTAR repeater looks like  (TXM)

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Inside a DSTAR repeater.

And the Icom 7100 with retro microphone

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73 Dave M0TAZ

New antenna testing at GB0SNB

Exposed on the side of a 50 meter mast the antenna often requires maintenance. George M1GEO and Chris G8OCV have over the years perfected the best way to mount the antenna, and on this occasion is had lasted close on 2 years. Antenna maintenance in the afternoon sun is much preferable to winter rain, so we too advantage of the weather to pull up the new doublet antenna.

 

The doublet is 40m per leg, into 300 Ohm ladder line and then a 4:1 Balun.

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The centre of the antenna is made from a plastic chopping board from one of the discount value stores, ideal for insulators. The wire is multi strand 13A flex, ideal for antennas and hopefully robust enough to survive the winter weather.

The centre of the antenna is pulled up onto the mast, elevated to 20m and the ends are on one side into a tree and the other a warning siren.

Dave M0TAZ (Left) and Chris G8OCV working 80m SSB

 

 

Its quite difficult to locate suitable points for the antenna ends, and elevation without snagging in the local trees is always a challenge. Once setup we managed a couple of QSO on 80m.

73 Dave M0TAZ

© 2015 Dave, M0TAZ