Magnetic loops for HF pedestrian mobile - Part 4

Another look at the lightweight magnetic loop suitable for HF pedestrian mobile work.

In this video I discuss the variable capacitors used and improve the mounting of the coupling loop, using common garden irrigation fittings. You'll also see a smaller and lighter case to carry the transceiver and battery.

The loop is again taken along the beach. Ten metres proves rewarding with contacts to VK6 (approx 2500km distant). And a member of the public suggests the loop should be on 'New Inventors'.

Stations worked and whose voices are on this video include: 40m: VK2AXB, VK3MQ, VK3ATA, VK5NJ, VK5FTCT & 10m: VK6HOT, VK6BMR.

Category:

Science & Technology

Tags:

• amateur
• HF
• radio
• QRP
• portable
• magnetic
• loop
• pedestrian
• mobile
• SSB
• FT-817
• homebrew

[vk2tpm]

I think you should consider a kite antenna. Awesome.

[vk3ye]

@vk2tpm I've wondered about that - but might run out of hands - and I'd hate it to tangle with a parasailors!

[melbourneradio]

Peter, really keen to build one of these. I take it beehive caps are rare as I can't locate them in AU. Ebay has some at 30pf which I guess would reduce the available bands. Where is the best place to source electronic parts (hamfests)? Jaycar aren't really good. Could try rockby I guess.

[vk3ye]

@melbourneradio I'd be buying a couple of those eBay caps. 2 in parallel will give you up to 60pF which will be fine. It might be hard to get low enough minimum capacitance for 10m but you could always make the loop slightly smaller to compensate (I'm thinking of doing this for mine so I can cover 29 MHz FM on mine).

Look for old VHF radios for beehive trimmers - preferably lowband - moorabbin hamfest in a week or so is your best bet.

[saforbes99]

What a great video! I'm looking to build a loop for the patio. I'm thinking walking around with one is good for picking up the ladies now ;)

[MADCAT501]

Hi Peter! Just had a QSO with you on 40 meters. Most enjoyable!! Thanks! It ends up Ive seen quite a few of your videos allready mate! Both Matty and I are very impressed with your work! We Will keep an ear out for you mate!! Best 73's!! VK1MAD. (Shane).

[vk2bpw]

Excellent Peter! Thank you

[rvisokey]

Operating over salt-water is cheating! :-)

[melbourneradio]

Thanks for the tip. Marked in the diary.

[MEverett98]

Thanks Peter for clearing up the Bee-hive cap. I've never seen these before.