AmateurRadio.com

Portable, Ground Plane for 2 Meters made with BNC antennas

that you can ‘take down’

Its a compact ground plane antenna for portable use!

2 Meter Ground Plane Portable Gizmo Antenna in Operation 2

This antenna is built on a 2 inch washer. Holes were drilled in the washer to accommodate 4 radials. The center hole for the BNC to BNC connector was already there, but had to be reamed out. This (male to male) connector is where the coax from the radio is attached on the bottom of the washer. It also serves to hold (the center radiator element)! 

(Note: The radiator, in the center, needs to attach to a BNC MALE connector, the cable from the radio also needs a BNC MALE connector. I used a male to male adapter for this purpose. It didn’t fit tightly so I used an old bike inner tube to cut a small spacer for taking up the slack. I’d have used a metal washer for ‘fitting’ the adapter, but I had already make 3 trips to the hardware store, so I used what I had)

Gizmo Portable Antenna 

without the cover

Center Post of BNC Connector for the Radials are Shorted to the Shell Side

I used BNC female connectors from, Digikey, a good source for components! The center post of this connector is shorted to the ‘shell side’ to provide a ground plane with all the radials!

The 24 inch antennas from China were purchased on Ebay! CHEAP!  The 2 inch washer is from the local hardware store. Everything fits on this washer, a 2 inch space, but the center coax is tedious to attach with all the radials in place, especially if you have big fingers.

The Cap is from a spice bottle!

I live alone so it was not a problem! LOL

Spice Bottle Cover

I love to use things for which they were never intended! This spice bottle cap is a good example of this. At this point, I’m not sure if I’ll seal it to the top BNC antenna radiator element or not? If I seal it (with hot glue, maybe) , the cap becomes permanently attached to the radiator element, and would be difficult if not impossible to remove. The whole idea here is to use this antenna as an impromptu portable antenna!

2 Meter Ground Plane Portable Gizmo Antenna Hanging from a Taped Tie Wrap

A tie wrap is used to ‘hang’ the antenna. Its hanging from a hook on my porch at the condo. I put 50 watts into it to get a repeater 10 miles away. SWR was 1:1 This is a portable antenna! Its not meant to be a permanent one. If you have ever needed a 2 meter antenna that you can pull up into a tree with a string or rope, this is it! Hauling it up 40 or 50 feet on a rope will get you better results than at ground level.

There is a joke that says, have you ever seen a golfer with only 1 club? Ham radio antennas are in the same category as golf clubs. You just can’t have too many! 

All the elements can be removed for easy storage and transport, (radials as well as the vertical element)! I’m sure some clever ham will come up with a suitable case for this entire assembly. If I had one of those nifty clear plastic shipping tubes, I’d store in that! I’ll be on the lookout for one!

I was out running errands over lunch and I had my VHF radio scanning the local ham repeaters. It was almost noon, which meant it was time for all of the talking controllers to start telling me the time. It’s a bit annoying – some of these systems only transmit to tell the time, as their users have either passed away or moved away. Even more annoying to me was the fact that none of their clocks were synced to an accurate time source. And then one of the repeaters started rebroadcasting the NWS severe weather outlook for this afternoon.

What may be annoying to me is experimentation and fun for others. I’m sure that the repeater builder that did the NWS radio interfacing had a good afternoon, weekend, or even week of experimentation to get it all to work. And the ham that programmed his custom macros into his controller probably had a hoot getting it all setup and customized.

I got to wondering…are all of these automated and retransmissions legal? This led me down one of my favorite rabbit holes – www.repeater-builder.com. There I found this posting from WA6ILQ, The article is about weather radio interfacing to repeaters….but the fun part is near the bottom where he quotes an old ham about don’t asking for permission…just go do it.

> The words were "Don't even (expletive deleted) THINK about it".
> As in don't make that (expletive deleted) phone call, don't write 
> that (expletive deleted) letter. Just build your wondertoy and use 
> it - but do it carefully, and cleanly (as in spectrally clean), and 
> make sure that you have your technical and legal arguments worked 
> out well in advance. Make sure that you aren't doing the A, B, or C 
> that the FCC forbids amateurs to do. If the FCC does't like your 
> brand new wondertoy or it's effects or emmissions they will send a 
> certified and return-receipt-requested cease-and-desist letter telling 
> you to stop doing it. At that point you stop doing it and send a 
> registered and certified and return-receipt-requested letter back  
> the next day (call in sick to work if you have to). In that letter 
> you say "I received  your letter on date (X) and at time (Y) 
> and at time (Y+5 minutes) I shut off the offending transmitter and I am sorry, 
> I didn't realize it was illegal and my thinking was (yadda yadda yadda) 
> and (yadda yadda yadda) and (yadda yadda yadda) and how can we resolve this?".
> (and you thought that those creative writing classes in college and 
> university were a waste of time...)

Words to live by. In ham radio, don’t ask, just do. And who am I to complain? I can always update my scan list. I’m glad I’m a part of a hobby that lets this stuff happen!

I was out running errands over lunch and I had my VHF radio scanning the local ham repeaters. It was almost noon, which meant it was time for all of the talking controllers to start telling me the time. It’s a bit annoying – some of these systems only transmit to tell the time, as their users have either passed away or moved away. Even more annoying to me was the fact that none of their clocks were synced to an accurate time source. And then one of the repeaters started rebroadcasting the NWS severe weather outlook for this afternoon.

What may be annoying to me is experimentation and fun for others. I’m sure that the repeater builder that did the NWS radio interfacing had a good afternoon, weekend, or even week of experimentation to get it all to work. And the ham that programmed his custom macros into his controller probably had a hoot getting it all setup and customized.

I got to wondering…are all of these automated and retransmissions legal? This led me down one of my favorite rabbit holes – www.repeater-builder.com. There I found this posting from WA6ILQ, The article is about weather radio interfacing to repeaters….but the fun part is near the bottom where he quotes an old ham about don’t asking for permission…just go do it.

> The words were "Don't even (expletive deleted) THINK about it".
> As in don't make that (expletive deleted) phone call, don't write 
> that (expletive deleted) letter. Just build your wondertoy and use 
> it - but do it carefully, and cleanly (as in spectrally clean), and 
> make sure that you have your technical and legal arguments worked 
> out well in advance. Make sure that you aren't doing the A, B, or C 
> that the FCC forbids amateurs to do. If the FCC does't like your 
> brand new wondertoy or it's effects or emmissions they will send a 
> certified and return-receipt-requested cease-and-desist letter telling 
> you to stop doing it. At that point you stop doing it and send a 
> registered and certified and return-receipt-requested letter back  
> the next day (call in sick to work if you have to). In that letter 
> you say "I received  your letter on date (X) and at time (Y) 
> and at time (Y+5 minutes) I shut off the offending transmitter and I am sorry, 
> I didn't realize it was illegal and my thinking was (yadda yadda yadda) 
> and (yadda yadda yadda) and (yadda yadda yadda) and how can we resolve this?".
> (and you thought that those creative writing classes in college and 
> university were a waste of time...)

Words to live by. In ham radio, don’t ask, just do. And who am I to complain? I can always update my scan list. I’m glad I’m a part of a hobby that lets this stuff happen!

The Scorpion Antenna is mounted in a good spot in the rear of my pickup truck bed. Seen here at Hagen’s Cove in Perry Florida on the Gulf of Mexico in the ‘big bend area’!

Going Mobile, Rag Chews, Nets, CW, its all available and very doable when you are on the road!

Mobile HF radio adds yet another dimension to Ham Radio. This is my second go, at HF Mobile operation.

Years ago, when ‘real life’ happened to me, I had no home QTH to operate from so I bought a new (at that time) Icom 706 M II G radio.  It was a great choice. A DC to daylight rig, and its still working 15 years later. This next episode of HF mobile is greatly improved over my previous one. A good antenna at the time, was made by High Sierra. It was a screwdriver type. (the original mobile antenna’s were nick named ‘screwdriver’ because they used an electric screwdriver for moving the coil)

High Sierra no longer makes mobile antennas, but the good news is there is a good company making them in Arizona, Scorpion antennas!

Scorpion Antennas

The Scorpion antenna is a heavyweight, at 18 pounds and it needs a very robust base to hold it. Breedlove Mounts

Its the Rolls Royce of Mobile screwdriver type antennas, and not just because I bought one, it is indeed, a very rugged and carefully crafted antenna.

I’m primarily a CW op so I incorporated a touch sensitive paddle to do CW on the move or sitting still in a local park like this one at Hagen’s Cove, on the Gulf of Mexico in the ‘big bend area of Florida!’

The cap hat ‘whip’ is a 3 foot rod of solid aluminum. It shortens the overall whip. This is nice for parking my truck in the breezeway without hitting the roof.

A motorized coil is moved up or down electrically! Listening for the greatest noise, depending on the band of choice, puts me in the ball park for checking the SWR. A 1:1 ratio is easily obtainable if care is taken during installation. Bonding straps are a must. All the parts of the truck body, door, tailgate, hood, fenders and truck bed, must be bonded together to from a good RF ground. Not a DC ground, mind you, but an RF ground plane. (The ‘other half’ of the antenna’)

All the body parts of the truck must be bonded together with straps. RF flows on the surface not the cross section of a conductor, so the wider the better. Copper flashing best carries RF current but a compromise is make for braid due to continuous flexing while opening and closing doors, and tail gates.

Bonding is one of the things that separates a good installation from a poor one. I had fun with the first truck and radio set up back in 2001 but I learned a lot about mobile HF radio since then and did things differently this time.

Location, location, location! It sells real estate and its very important for HF Mobile Antennas!

What makes a good location on a vehicle?

I’ve seen many examples of HF radio antenna installations that work, but some work much better than others. Besides bonding, another good trick for a good installation is to use a very good location; the main mass of metal must be Directly under, not near, the base of the antenna. Will a bumper mounted antenna work? Yes, but one with a mass of metal directly beneath the antenna will work better.

Its simply a case of, more bang for the buck!

Positioning the bottom of the movable coil above the truck side wall is best.

The Scorpion antenna movable coil still has the protective bubble wrap on it in this picture.

Scorpion Antennas

Clearance is important!

The bottom of the coil must have clearance from metal objects like the side wall of the truck.

Detailed installation instructions come with the scorpion antenna. This is very important. A good installation will insure good operation.  Skimping on installation will only hurt you in the long run.

I installed an auxiliary battery in the back set compartment of the truck. Its a sealed lead acid 75 Ah battery made by Optima. I bought it trough Apex Battery.

Optima Blue Top from Apex Battery co.

Optima Blue Top 75 Ah Auxilliary Battery

I can use either the auxiliary battery or the truck battery or both at the same time, thanks to a marine dual battery manual switch.

See its picture below.

I used #4 wire to connect the truck battery in parallel with the auxiliary battery in the back seat area. This large gauge wire greatly reduces voltage drop between the batteries. For extended stays in one place, I can operate on the auxiliary battery, without running the engine. This insures that the separated truck battery will start the truck when I’m done operating.

I have not yet mounted this switch on a back board, but that is coming. I need both hands to operate the switch now and I want to be able to do it with only one hand!

Perko Switch

Dual Battery Switch in the -Both-Battery- Position

The business half of the IC 7100 is mounted to the floor of the truck on the hump. The battery box can be seen with a power pole connection box on top.
The control box for the IC 7100 rides up front on the center console as does the touch sensitive paddle. The microphone hands on the cup holder.

I have a Warren Gregoire headset for SSB. It features a noise cancelling microphone. Warren Gregoire Headset (no relation to me)

(Special note here; its illegal to have both ears covered with a headset in Florida while you drive.)

Its a stupid law because you can legally drive in Florida even if you are stone deaf! So that kills the reasoning for ‘listening to sirens’ on emergency vehicles!

Okay, that rant is done!  Back to the Mobile installation.

Battery Box, with Power Pole Box,-top, IC 7100-bottom

AA1IK, Using Warren Gregoire Headset 2
Join me on a new Yahoo Group for HF Mobile ops.
New HF Mobile Yahoo Group

Here I am using the Warren Gregoire headset. This headset has a noise cancelling mic so its a good fit for mobile HF radio. SSB is a new thing for me. I’ve been a CW op, for most of my ham life. I’m having a great time meeting new folks all around Florida on 40 Meter SSB. Ham radio has lots to offer and I’m glad I have not yet exhausted all the possibilities. I have not forsaken CW, but SSB is a fun mode, as I’m sure many of you already know.

The IC 7100 is a two part radio. You saw the ‘business end’ in a previous photo. This photo shows the control head and the touch sensitive paddles Touch Sensitive Paddles They are held in place with a bungee cord. The black plate that you see here is a small plastic clipboard with the clip removed. It is glued in place to the light brown plate, and that is also a clipboard with the clip removed. Both clipboards are held in place with bungee cords. This allows me to remove the control head and the paddles for security reasons.

IC 7100 and Touch Paddles

Remote Switch-top, SWR/RF PWR Meter-left, Speaker-right

The remote switch for moving the antenna up and down to tune in each band is show in the little cubby hole. The SWR/PWR meter is stuffed into a hole where the ‘never has been used-ashtray’ was. The speaker is mounted just above the cup holder.

Remote Switch Moves Antenna Up and Down to Tune Each Band

This photo shows the remote switch. It is hand held, and easily put away after the antenna is tuned.

So! That is pretty much the end of a walk through in my new mobile ham radio shack. So far, I’ve listened to CW on the road but have not called CQ or talked to anyone while driving. I became interested in CW Mobile early in my ham radio career.

The first requirement for operating CW Mobile, according to an article that I read on the subject, said to ‘become a dynamite CW operator! Its been almost 25 years since then and I’m still working on that first requirement.

I’ll keep trying!

De AA1IK

Ernest Gregoire

There is a new sunspot region rotating into view, producing moderately-strong (M-class) x-ray flares. This video shows you the first 11 hours of May 5, 2015

Expect flares throughout this week, which will degrade HF propagation DURING the flare, but enhance propagation overall (due to the higher Radio Flux). There might be occasional coronal mass ejections, too.

https://www.youtube.com/watch?v=lgis5Bg8dBk