Windcamp proves its worth in Samford CP activation

Today I activated Samford Conservation Park VKFF-1639 once more in an attempt to secure four contacts to bring my total to ten. It would also be the first time I would use my new Windcamp LiPo battery.
Setting up my long wire antenna was interesting: I needed a heavy tree branch to act as an end support. The far end was supported by my squid pole.

It’s all about improvisation.

At the start of the activation, my internal Windcamp LiPo was putting out 12V which allowed me to operate at a full 5W. By the time I had made four contacts, I had been operating solidly for an hour and seven minutes. The voltage on the display was now reading 11.8V.

I am more than happy with that.

Advertisements

New battery power for my FT-817

I have long wanted/needed to upgrade my battery power for my Yaesu FT-817. The prompt came when the internal battery died. My choice was the kit put out by Windcamp; a 3000mAh internal LiPo battery and new battery compartment lid for the radio that comes fitted with a PCB and charging circuitry that allows the supplied mains charger to charge the battery while inside the radio.

The parcel arrived from China beautifully packed. The battery and the new replacement lid came packaged in very nice plastic cases, which, together with the instructions and charger, all fitted into a compact cardboard box for shipping.

The contents of the parcel.

After extracting the individual components from their packaging, it was time to think about installing the battery into the radio.

It is a tight fit but the components plugged together as intended. Note the PCB on the underside of the new lid.

When the battery and associated wiring was all nice and snugly fitted, I popped the lid closed and got ready to charge the new LiPo battery.

The new lid in place and ready for charging.

The charger has a double-coloured LED to indicate the state of the charge: red for charging and green for a completed charge. The initial charge takes around 5 hours to accomplish.

According to the supplied documentation, the rated voltage of the battery is 11.1V, with the output voltage range stated as between 9 and 12.6V. The maximum output current is 4A.

Now to test it in the field.

Working F0-29

Now that I have worked an FM satellite (in my case SO-50) the next challenge was to try a SSB satellite.

The basics would be the same I figured, except I would need to use my Yaesu FT-817. In fact, all I needed to do was to switch rigs and take into account that I would be needing to run to 817 off my 7 a/h SLAB, which I would need to slip into a spare camera bag so I could carry it over one shoulder.

The battery is in a camera bag hanging on my left side, and the FT-817 is slung around my neck (I knew the strap would come in handy some day).

So that I could work the satellite single handed out in the field without the aid of computer software, this is what I did:

  1. Set the rig into split mode
  2. Set VFO A to 145.960. This is the uplink.
  3. Set VFO B to 435.840. This is the down link
  4. Make sure the antenna connection is set to the front connector on the radio
  5. Keep the radio set to VFO B

When I saw the satellite is within range (using Satellite Explorer on my PC), I went outside and pointed the antenna into the rough direction of the satellite’s approach. This was roughly north. Then I put out a call (the radio switches to VFO A automatically when the PTT is activated but returns to VFO B when it is released. Then I immediately began tuning down the band to listen for replies.

Sure enough, I heard Wal VK4CBW, George VK2WEL and Geoff VK2ZAZ. I had a very satisfying QSO with them, but it was challenging having to continually alter the receive frequency by hand during the receive cycle while altering the direction of the antenna to take into account changes to direction as well as height, all at the same time.

Next is to think about improving my operating setup, perhaps with some form of automatic tracking capability.

 

 

Springbrook National Park dissapointing

Sunday 21st May 2015 was to be a good opportunity to work some Park to Park contacts as the VK5 mob had organised a mass activation to coincide with the WIA AGM. So I decided to activate Springbrook summit VK4/SE-011 and Springbrook National Park VKFF-0463.

The only problem was that Cyclone Debbie had washed away all bridges leading up to Springbrook. The only access road was a back road through the Numinbah Valley. So my wife and I set off nice and early on the 1 hour 40 minute run, but missed the crucial turn and ended up going the normal way up, via the Gold Coast. By the time I realised my mistake it was too late; we were committed.

Just as we drove into the Springbrook National Park, we encountered a road block. Those manning it told us what I suspected. If we wanted to reach the summit we’d have to retrace our route back and go the back route – an additional 40 minutes they told us. So we decided to set up the station along the banks of the river just inside the boundary of the park.

My shack for the activation. Nice cover at least.

My rig for the day was the Yaesu FT-817 with an LDG Z-100 Plus ATU, 7a/h gelcell and an endfed antenna supported by a squid pole. My paddle was the Pico Paddle from Palm Radio in Germany.

This was the first time I used my new Sherpa pack. Fabulous.

All went well and I heard loads of traffic on 40m, all working the various VK5 parks. It was the first time I had been working against pile-ups! Fortunately I was able to tail gate a few contacts and worked two parks: Gerard VK2IO in VKFF-1278 and Rob VK2AAC/2 in VKFF-0004. That was the end of my SSB contacts as my 5W was no match for the 100W stations I was competing with. So it was out with the Pico Paddle and within a few minutes I worked Mike VK2CCW and Ian VK2BJT. CW is really great as it allows you to make contacts despite being low power.

I wasn’t able to activate the summit for SOTA; that will be another time now as I have unfinished business. But we did get to log four contacts towards WWFF and saw first hand the damage a cyclone can cause.

DSC01800

These are some of the trees that were up-rooted during the cyclone.

FT-817 Escort for portable work

I came across mention of the FT-817 Escort on You Tube recently and decided it looked like just the thing I needed. So I ordered one from Portable Zero (http://www.portablezero.com/). It arrived, together with a Sherpa Pack that I also fancied, in about a week.

 

The contents of the package, with a good set of instructions.

Installing the side rails and fold-out stand was easy enough, with no dramas at all. And the completed job looked real cool.

I ordered mine in military green; it also is available in black.

The stand eliminates one of my dislikes of the Yaesu FT-817: it’s hard to read the display when out in the field or even in the shack due to the lack of a tilt stand. The escort also offers protection for the knobs, which are easy to damage or move while in the field.

The stand tilts the rig up nicely. It folds away easily too for transportation.

I have enjoyed using the rig now in the shack and look forward to taking it on an activation.

The radio is use in the shack.

Activating Fort Lytton, VKFF-0179

I decided to activate Fort Lytton National Park  on Sunday 23 April 2017 for two reasons: firstly it has never been activated before and secondly, it’s considered to be the birth place of Queensland’s military history.

DSC01712

The above picture is of the Fort’s parade ground.

This coastal fortress served as Brisbane’s primary defences from 1881 until 1965. It was even used during WW11, when some 89 US submarines were docked here for repairs during the war.

There is an interesting museum there now, including a good display of military radio’s, which I particularly liked.

Resized_20170423_105344

I was fortunate in finding an excellent operating position, right alongside the river under a gazebo. The picnic bench was just perfect and it was unoccupied.

Resized_20170423_113559

Being a first activation meant that I was able to make a quick ten contacts, on both SSB as well as CW. The rig I used was my FT-817 that tuned an end-fed long wire by means of an LDG auto tuner. My key was my new pico paddle, which worked beautifully.

The weather was perfect, the exhibits were wonderful and the activation was a success. Will need to revisit this site again sometime.

DSC01689

Reverse Polarity Protection

As the Yaesu FT-817 doesn’t have any reverse polarity protection or an in-line fuse, I decided to build myself one seeing I do a lot of portable work on summits or in parks.
Diodes work fine but they do incur quite high losses in eventual output power, so with only 5W max available, this isn’t desirable.
The answer lies with the P channel MOSFET (FQP27PO6)
A quick search on line turned up this schematic.

Only one component!

This is quite a simple affair: when the battery is connected up correctly, the MOSFET is turned on allowing current to flow. When connected up incorrectly, it turns off.

It works thus: when the gate to source voltage is around -4V or less, it turns on. So if the battery is a 12V gel cell (as in my case), the voltage through the MOSFET  = 12V – 1V loss (due to the parasitic body diode) which equals 11V with respect to ground.The voltage at the gate is 0V as it is connected to ground. This means that Vgs = 0V – 11V = -11V. This is less than -4V so it turns on.

If the battery is connected up incorrectly, then we have Vgs = 0V –11V = 11V. so the devise turns off.

I mounted the MOSFET on a piece of vero board and used an ice cream stick as strain relief. I also included an in-line quick blow 5A fuse in the positive line.

All the components before final assembly.

Once the heat shrink had been slipped over the component, I heated it up with a hairdryer to achieve a nice, tight finish.

While I was at it I built another one for my Elecraft KX1.

Now it was time to test it.

 

All working as expected with the battery connected up correctly.

Now to switch polarity.

No voltage with reversed polarity.