October 28, 2012

Considerations For A New Antenna - Part 2: Installing a 6m Antenna

In "Considerations For A New Antenna - Part 1" we discussed the criteria and considerations for setting up new antennas in our new location.  In this article, we share how we went about setting up our first antenna in the new location.

We decided our first effort would be to set up a 6m ground plane antenna on a mast mounted on top our chimney.  6m is a wonderful band offering DX possibilities along with access to local repeaters.

For this project we would need:
  1. 6m ground plane antenna
  2. Chimney mast mounting kit
  3. Standard 1.5 inch x 5 foot antenna mast
  4. Low-loss 50-ohm coaxial cable (we use Bury-FLEX 1.1 dB of attenuation /100 FT at 50 Mhz)
  5. UHF connectors
  6. 8-foot copper clad steel ground rod
  7. Lightning arrestor (we use ICE coaxial lightning/EMP suppressors)
  8. Solder
  9. Soldering iron
  10. Electrical tape
  11. Self-sealing silicone rubber tape
  12. Ladder
  13. Rope and bucket
  14. Crescent wrench
  15. Leather work gloves
  16. Pair of HT's (optional)


In days gone past, items such as chimney mast mount and masts were commonly available in local hardware or electronics stores serving the needs of customers with TV antennas.  We went shopping in local area stores and found none had chimney mast mounts or even 5 foot antenna masts; though, they did have an 8-foot ground rod.  The ubiquity of cable TV seems to have reduced the need for TV antennas.  Thankfully, these items are still available through Internet retailers.

We ordered a Ronard chimney mast mounting kit and Winegard 5 foot mast and they arrived quickly.  The Winegard mast was more substantial than expected.  The mast was 18 gauge steel tubing without any visible seem.  The Ronard chimney mast mounting kit included stainless steel straps and heavy duty hardware.  The chimney mast mounting kit included very basic instructions for setting up the straps.

We had picked up an older 6m ground plane antenna brand new in the box at a ham fest several years ago for $20.00.  We had used this antenna with a 18 foot painters pole for an easy-to-setup ARRL Field Day antenna.  We used our MFJ-269 antenna analyzer to cut the antenna centered around the SSB DX calling frequency of 50.125 Mhz (see 6m band plan below).

We also had a lightning suppressor, electrical tape, self-sealing silicone tape, coaxial cable, UHF connectors, and the tools already available in our shack.

Safety First

Amateur radio is generally a very safe activity.  There are potential risks to consider and take the necessary precautions.  Among these is coming in contact with high voltages and currents, falling from heights, and having something fall on you.  Our motto is, "safety first" and this mindset helps us avoid accidents.

Installation Preparation

The first step was call the local utilities and request them to identify buried cables and gas lines.  They came out within a few days and marked everything clearly with spray paint and flags.

We next surveyed the work areas looking for hazards. It is critical before starting to make sure that any new antenna installation cannot come in contact with overhead wires or buried utilities.  We confirmed that no hazards were present.

We assembled all the parts and tools at the base of the chimney and enlisted a helper.  This job could be done by one man; however, two hams are better than one.  It is considerably safer to work with a helper since ladders and heights are involved.

We also brought out a pair of 2m HT's to aid with communication between the roof-top work and the ground-work.  This is so much effective than yelling back-and-forth at the top of your lungs and being misunderstood.  We are hams after all.  There is typically a fair amount of wind noise up on a roof that can interfere with being heard without the aid of a radio.  This helped avoid a comedy exchange, "I said, send up a WRENCH not go sit on the BENCH!!!" or "What was that?  Did you say, GO! or NO!?"

Installing the Chimney Mast Mount

The Ronard chimney mast mount included directions for fastening the stainless steel strap to the strapping clip.  However, no other directions were provided.  The mount itself is a fairly simple device and perhaps assembly is self evident.  Installation is another matter.  Installing the mount took a bit of trial-and-error to get it right.  Here are a few things we learned:
  • Wear leather gloves when handling the stainless steel strap.  The strapping is razor sharp.  We didn't think to bring gloves to the roof top and by the time the installation was complete our hands had a dozen or so nicks.
  • Pre-bend the strapping into shape before placing around the chimney.  The strapping wants to return to its coiled shape unless you counter this with new bends.  It is much easier to handle the strap when it is in the approximate shape of the chimney than if it is in the approximate shape of a tightly wound coil.
  • Wire cutters won't cut stainless steel strap.  Perhaps there is a better tool?  We didn't discover this until we were on the roof so we ended up using metal fatigue to break the strapping in the desired place. 
  • Prepare the strap and strapping clips on the ground.  If we had it to do over again we would pre-cut the strap to the desired length and pre-install the strapping clips all on the ground.  This would avoid the possibility of losing one of the small clips on or over the side of the roof.  It would also be easier and provide more convenient access to tools in the workshop.
  • We kept our hands free while climbing the ladder and roof and used a rope and bucket to hoist up parts and tools from the ground.  Here is our helper made the biggest contribution.

Installing the 6m Ground Plane Antenna

Attaching the mast and ground plane antenna was the easiest part of the installation.
  • Build the antenna on the ground.  The antenna has 5 main parts that needed to be assembled.  Once assembled the antenna is light and somewhat bulky.  We choose to build the antenna on the ground for ease and safety.
  • Hoist up tools to the roof with the aid of a bucket and a line.  Communicate with the helper on the ground with an HT.  Make sure the helper stands well away from the roof line or where anything could fall.
  • Hoist the mast from the ground to the roof with a line.  We passed the line through the mast from one end to the other.  We tied a wooden dowel to the rope at the end of the mast and hoisted it up.  This kept the mast in the same orientation as the line and made it very easy.
  • Hoist the antenna from the ground to the roof with a line.  We tied the rope to the bottom of the antenna and also at the top.  This allowed for an easy hoist in a vertical orientation to the roof.
  • Hoist the coaxial cable from the ground to the roof with a line.  We tied the rope to the coaxial cable and hoisted it up with ease.  Take care there are no twists in the coax that could turn into a kink (bad for coax) while hoisting.
  • Seal the coaxial connection.  Some people prefer coax seal.  We prefer applying a couple of tight layers of good quality electrical tape followed by a wrapping with self-sealing silicone tape.  This will prevent water intrusion and corrosion. 
  • Secure the coax to the mast with electrical tape or cable ties.  This prevents the coaxial cable from bouncing around against the mast in high winds.  Provides some strain relief as well.
6m Ground Plane Vertical Antenna Close Up

Installing RF Grounding System

We used a step ladder to stand on to drive the 8ft ground rod with a 8 pound hammer.  This made it easy to keep the hammer on-target as it went into the ground.  We switched to a larger sledge to drive the last foot or so.

We attached an ICE suppressor bracket with 2 ICE lightning suppressors mounted to the top of the ground round.  One lightning suppressor for use on 6m and the other for an HF antenna.

We placed the lightning suppressor and cabling within an enclosure to provide some protection from the elements.

Lightening arrestor system

First 6m QSO

We connected the cabling to our Kenwood TS-480SAT and powered up.  We had a local Pittsburgh 6m repeater already programmed into memory (51.740 Mhz with a PL tone of 100.00 Hz) so we dialed it up and found a group of hams in a ragchew.  So far so good on receive.  We were wondering if the antenna would tune up and transmit?  We hit, "tune" and sure enough it tuned immediately.  This was a good sign that everything was in order.  We waited for a pause and then transmitted giving our call.  One of the hams came back immediately acknowledging our call and inviting us into the group.  Voila!  6m ground plane vertical antenna project success!

6m Ground Plane Antenna mounted on chimney

Since our first QSO, we have enjoined joining into the Pittsburgh 6m repeater net and finding a few other local 6m repeaters we can reach.  We are also eagerly awaiting a 6m opening when we can give 6m DX a workout with the new antenna and make progress toward our ARRL 6m DXCC award.

The 6m band is the "magic band" and has something to offer everyone - from DX'ing, repeaters, ragchew, CW, digital, ...

ARRL 6 Meter Band Plan, 50.0-54.0 MHz 50.000-50.100 CW and beacons
50.060-50.080 Automatically controlled beacons
50.100-50.600 SSB 50.125 SSB DX calling frequency 50.200 SSB domestic calling frequency (Note: Suggest QSY up for local & down for long-distance QSOs)
50.600-51.000 Experimental and special modes 50.700 RTTY calling frequency
50.800-50.980 Radio Control (R/C) channels, 10 channels spaced 20 kHz apart (new)
51.000-51.100 Pacific DX window
51.000-52.000 Newly authorized FM repeater allocation
51.100-52.000 FM simplex
52.000-52.050 Pacific DX window
52.000-53.000 FM repeater and simplex
53.000-54.000 Present radio control (R/C) channels, 10 channels spaced 100 kHz apart

Shortwave Reception

An unexpected side benefit was the antenna's receive capabilities.  While tuning around HF we discovered the antenna performed nicely as a shortwave receive antenna.  We were surprised how well it received shortwave stations.  We attribute the quiet performance to having a good RF ground and installing the antenna above the roof line.  In the past, we have always used horizontal wire antennas (i.e. long wire, dipole, and fan-dipoles) for shortwave reception.  This antenna has given us a new appreciation for a VHF vertical for shortwave reception.  This is also something to keep in mind when in an emergency situation - a VHF antenna is an asset for both VHF and HF reception.



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October 27, 2012

CQ World Wide DX Contest

10m opened up world wide to the great enjoyment of hams participating in this weekend's CQ World Wide DX Contest.  We joined in the fun and participated in the contest with our modest station.  The QSO's were plentiful.  We completed 170 QSO's with 97 countries earning a final score of 47,854.

The cold and wet weather provided additional motivation to stay in the shack.  No sense in getting to know "Sandy" the so called Frankenstorm any more than on a first name basis.

We rather liked the Italian IO5O qrz.com webpage with the club's live streaming video of their participation in the contest.  A unique way to view radio.  Thanks for the contact Ten-Fifty Contest Group.



October 26, 2012

Warm Glow of Linear Amplifier Tubes

Autumn is wonderful time of year.  No better way to warm up the shack then by powering up the gear and getting on the air.  We didn't need a flash when we took this photo of these Ameritron linear amplifier tubes at work.

Warm Glow From Ameritron Linear Amplifier Tubes

October 24, 2012

Antenna Coaxial Cable Conduit Fill Considerations

Conduit fill is the percent of the area inside the conduit taken up by cables.  Conduit fill is an important consideration when selecting and planning your antenna projects since it is not possible to use 100% of the conduit's area.  There is no sense in going through the expense and effort of trenching, laying conduit, and pulling your antenna coaxial cable only to find later that the conduit is too small to support the area consumed by the cables.
We recently ran across two handy Internet resources related to conduit fill: Conduit Fill Chart and Conduit Fill Calculator.

Here is an example of the conduit fill calculators output:

The conduit fill is: 17.9%

Based On:
Conduit Type: Rigid PVC Conduit, Schedule 40
* Conduit Size: 2 inch(es)
Internal Diameter: 2.047 (in.)
Conductor #1: 3 conductors with an outside diameter of .5 inches.
Conductor #2: 0 conductors with an outside diameter of 0 inches.

**Warning: There is some probability of jamming.



October 19, 2012

55th annual Jamboree on the Air (JOTA) is October 20-21

The 55th annual Jamboree on the Air (JOTA) is October 20-21. This 48-hour event runs from 0000 (local time) on Saturday, October 20 (right at midnight Friday) through midnight (local time) on Sunday, October 21. JOTA is an opportunity for Cub Scouts, Boy Scouts, Girl Scouts and Girl Guides from all over the world to experience the magic and excitement of Amateur Radio.

Radio amateurs do not have to be registered to get on the air during JOTA. In addition to the World Scout Frequencies, the BSA has listed a US frequency guide that includes frequencies for 80-6 meters (SSB, CW and PSK31), 2 meters, 70 cm and D-STAR, as well as dedicated IRLP and EchoLink nodes.

In our local Pittsburgh area, the Skyview Radio Society has organized JOTA events including a radio merit badge class.  This is sure to be a wonderful event and everyone involved is looking forward to it.

Be sure to get on the air this weekend and make some contacts with scouts (the future of amateur radio).

October 14, 2012

How To: Lock Together Anderson Powerpole Connectors

Anderson Powerpoles are a wonderfully useful invention for radio amateurs.  They are connecting power to more and more amateur radio equipment every day and have become the defacto standard for 12v power connection.  Interestingly, radio manufactures are still catching up on this trend.

When two Anderson Powerpole connectors are connected together they snap together but are not locked.  This allows quick connect / disconnect and works just fine in many situations.  However, there are several situations where locking the connectors together is required.
  • The power cable is subject to movement which could work the connection apart.
  • The power cable with a vertical orientation and connection where gravity could pull the connection apart.
  • The power cable and connection is being pulled during routing which could cause a disconnect.
There are commercially available retention clips to lock Powerpole connectors together.  These cost around $0.60 / clip.  Hams are nothing if not thrifty.  Why buy expensive clips when there is an alternative way to lock together Anderson Powerpole connectors for next to nothing?

The secret is to use a suitably sized wire tie.  Wire ties are cheap, fast, easy, and work perfectly to lock Powerpoles together.

Select a wire tie slim enough to pass through the small holes on the Anderson Powerpole connectors.
Anderson PowerPole connectors and wire tie

Just slip the wire tie through the holes on each Anderson PowerPole. 
Anderson Powerpole connectors locked together with aid of a wire tie

Voila!  The two Anderson Powerpole connectors locked together.  To disconnect just give the wire tie a quick snip with wire cutters.


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October 6, 2012

Eye Catching Store Front

We stumbled onto an eye catching store front window display in Sault Ste. Marie, Ontario recently. 
Loved the stacks of boat anchor gear and brick HT's.  The next day we returned to Sonic Northern Group during business hours and met the manager, Ken.  Not surprisingly, Ken is a ham and collector of classic radio gear.  We had an interesting chat about amateur radio in the area.

By the way this article was composed on an Android device as an experiment. 

October 5, 2012

EPC Russia DX Contest 2012

EPC Russia DX Contest 2012. The contest starts at 04:00 UTC 06.10.2012 and ends at 04:00 UTC 06.10.2012. The objective of the contest is to establish as many contacts as possible between radio amateurs around the world and radio amateurs in Russia on BPSK63 mode. The Contest is annually held at the first weekend in October in BPSK63 mode on 160, 80, 40, 20, 15 and 10 meters bands. Every station can be contacted once per band. The operator may change the bands without any restrictions. The output power should not exceed 10 watts on 160 meters and 100 watts on other bands. Only one transmitted signal is permitted at any time.