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1296 MHz Antenna for SOTA?


#1

Hi folks

Looking for ideas for a homebrew portable 23 cm antenna. I don’t fancy carrying a 10el yagi through the Aussie scrub. Anyone have a practicle antenna solution for 23cm SOTA?

73 Andrew VK1AD


#2

Make one of these, about 9dBd gain.


#3

There were some 23cm antenna ideas on another thread.
I use this one hand held. Got me 200+ KM on 1 W of FM at Easter.
[URL=http://s1019.photobucket.com/user/Comptonallen/media/SOTA%2023cm%20yagi_opt.jpg.html][/URL]
Compton


#4

I have one of those PC board Yagi antennas. Went to the local surplus store yesterday to get the parts to connect it to my vintage Yaesu FT-911 HT which makes a massive 1 W on 1.2 GHz.

I’ll post when I have the whole contraption soldered and working.

These are great little antennas from WA5VJB. 6 dB for $6 US.

http://www.wa5vjb.com/products2.html

wunder


#5

It looks a bit fragile to be stuffed into a backpack or even attached to the front side of the pack. It needs something to protect the quads. Perspex perhaps?

Andrew VK1DA/VK2UH


#6

Looks to me like it is mounted on the inside of a plastic sandwich box cover… sneeky

David
G0EVV


#7

This is mine:

http://www.marwynandjohn.org.uk/GM8OTI/proj23cm15eleyagi/proj23cm15eleyagi.html

It straps on the outside of the rucksack and it’s not fragile :slight_smile:
73
John GM8OTI


#8

You mean like this when packed with the 23cms handy and cables etc.

and


#9

Ok now I see how it’s constructed. Very neat!


#10

Neat Andy, and nice carpet too! :grin:


#11

I use the WA5VJB PCB Yagi like Compton’s most of the time. It’s 3db less gain than the double quad but 30db less volume!


#12

Thanks for the feedback. Some good examples of homebrew 23cm antennas and construction techniques to consider.

73 Andrew VK1AD


#13

My 23cm mb handmade antenna.


#14

Hi folks

I said I didn’t fancy carrying a 10el yagi around the Aussie scrub, well I constructed a 12el 23cm Yagi to carry around Aussie peaks with little to no scrub. The design is a DL6WU for 1296 MHz using VK5DJs Yagi Calculator.

The boom is 18 x 18 mm Wester Red Cedar, reflector and director elements are 3.1 mm dia aluminum rod, driven element is 2 mm copper wire and the balun is RG316. I will post construction details on my blog in the next day or so.

Homebrew 1296 MHz 12el DL6WU Yagi by VK1AD


#15

Hi Andrew,

Very neat construction! Moreover, you have used recyclable material for the boom to keep the CO2 footprint low!

This conversation about 23 cm antennas for SOTA started right when I wanted to buy a new VHF/UHF handheld and it prompted me to go for an Alinco tribander! I will have a 23 cm antenna soon, thinking about a double quad, MFM design in a lunch box.

73 Heinz


#16

Hi folks

Today from Big Badja VK2/SM-059 (QF43SX) using a SG-Lab 23 cm transverter and a homebrew 23cm 12el yagi, I worked Dave VK2DJS (QF46PV) on SSB over a distance of 324 km. My best long distance 23cm contact in only four weeks of operating on 23 cm. :slight_smile:

The signal had mulitpath characteristics with an obvious audio ‘flutter’ indicating possible aircraft enhancement AE.

FT-817 IF feeding a SG-Lab 23cm transverter 2.5 watts

view south from Big Badja VK2/SM-059

view north beaming at Dave VK2JDS from Big Badja

73, Andrew VK1AD


#17

I would put money on it!

Great performance considering the low power from these transverters (and good ears at VK2DJS).
What was used at the other end?


#18

Based on the photo Dave sent me, just after the QSO, plus reading his QRZ page, it would appear Dave is using a 4.6 metre dish. His 23cm station is at 940 metres ASL

Cheers

Andrew VK1AD


#19

< Louis Balfour > Nice! < /Louis Balfour >

:grin:


#20

Dave VK2JDS is an experienced EME operator on 1296.