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1
Antennas / Re: My Take on The NVIS X-Pole
« Last post by cockpitbob on January 20, 2018, 06:05:19 PM »
That looks nice.  Since this antenna requires a tuner I suppose it could be used for the higher ham bands too.  Of course they would be more for DX than NVIS, but it's always nice to have lots of communication options.

I'll have to remember this one.  Here in New England we have more trees than we know what to do with, so I could leave the poles at home and throw a line over a 15' branch.
2
Antennas / Re: My Take on The NVIS X-Pole
« Last post by scarr on January 20, 2018, 07:45:33 AM »
Nice work Andy - I'm working on something similar, basically a doublet cut for 80M with the legs in an Inverted-V config, also working from a 6M flag pole.

My yard is only 11M long, so this will mean putting a backpack on and finding a field!

It would be great to try and organise a sked at some point, since we're at a low ebb in the solar cycle, working other Irish or UK stations on HF is a real challenge. I think the low 1/2 wave doublet for 80M should allow it.

I don't intend operating in the dead of night, otherwise I'd probably need to look at 160M... that would be fun trying to set up.
3
Antennas / Re: My Take on The NVIS X-Pole
« Last post by gil on January 20, 2018, 03:26:20 AM »
Great. I saw the dxengineering page a while ago and some others, even using coils. I might give it a shot some time...

Gil

Sent from my SM-G928F using Tapatalk

4
Technical Corner / Re: Armored BitX40.
« Last post by gil on January 20, 2018, 03:23:33 AM »
Well looking at the circuit schematic, if you aren't going to use the supplied 10K pot to tune the VFO, then pins A0-A3 and A6 and A7 that are tracked to the CONTROLS header will be unused.

On the OSCILLATORS Header there are a number of pins unassigned already, D2 to D7 this should give you enough pins to map using the schema that Cockpitbob came up with.
Thanks Andy. I need to get back to it... But then there is the new uBitX... And I have been building other kits...

Gil

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5
Military Radios / Re: Man Pack Handset Question
« Last post by Sparks on January 19, 2018, 06:57:55 PM »
6
Antennas / My Take on The NVIS X-Pole
« Last post by Andywragg on January 19, 2018, 05:37:04 PM »
Hi Folks

Finally finished my attempt at an NVIS antenna for use in the field. Based on a mashup of designs from the military, Commsguy (via another social medium) and a paper by DX Engineering, here it is...(see attachments)

The X-Pole as I'm calling it is good for 80 and 40m and is self supporting. The mast (a lightweight fibreglass 6m telescopic flag pole) threads through the hole in the middle and stops at 15 feet where the diameter of the pole equals the hole in the middle. The 2 inverted V dipoles at 90 degrees support the mast when pegged out at 42 feet from the mast centre.

Made from 6mm Perspex (from my radio club), M6 stainless wing/nuts and bolts, and some bits from SOTABeams, plus a bit of 2mm Grizly Cub cord. I've got 30m of feeder cable to go with it as well, just need to put the BNC ends on it.

I hope to test it out once the weather calms down and gets a little warmer.


Design Doc from DX Enginneering can be found here...

http://static.dxengineering.com/pdf/WP-NVIS-Rev2.pdf

Cheers

Andy

7
Military Radios / Re: Man Pack Handset Question
« Last post by gil on January 19, 2018, 04:37:53 PM »
Quick question, does anyone know what kind of mic plug man pack handsets use?  I was wondering if these could be switched out.  Any information would be helpful.
See my thread on the armored Bitx40...
Gil

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8
Military Radios / Re: Czech Military RF-10 Radio.
« Last post by gil on January 19, 2018, 04:29:47 PM »
It's likely wide FM, being a low VHF band, mil set.
Definitely FM, but not sure about wide or narrow. Like Ray I'd assume wide.
Gil

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9
General Discussion / Re: Ordering from QRP Guys
« Last post by gil on January 19, 2018, 04:28:06 PM »
Hi Guys

I got a Paypal update last night saying that the item had been notified and is now in the USPS tracking system. Good news.
What did you order?
Gil

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10
CB / Re: Best CB radio for inside a jeep
« Last post by gil on January 18, 2018, 04:44:12 PM »
LOL, those hormones are terrible, fortunately we don't get all crazy anymore now ;-)

My KX2 is unlocked. Well, except for the CB band.  I wish Elecraft would allow it. Yaesu does... Of course I would not transmit out of HAM bands either but for an extreme emergency. The reason is partially legal, but mostly because I don't want to cause interference. It's like not littering... Some people won't do it, some don't care...

Gil

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