Showing posts with label Kruger park. Show all posts
Showing posts with label Kruger park. Show all posts

28 April 2014

Kruger Park Satara, Pretoriuskop and Berg en Dal camps

Back from our morning drive near Satara on Saturday morning, I was on 40 meters at lunchtime with a 569 report from Barrie ZS6AJY. Band conditions were definitely down from the evening before. I then checked into the AWA (Antique Wireless Association net) and met Andy ZS6ADY and also a call from ZS6PTA  (Pretoria Radio club), Ray who was looking for points towards the QRP contest.

On Saturday evening we went for a drive towards Orpen Gate. Fantastic! We witnessed two young male giraffe 'necking' in the middle of the road. We watched them tangling with each other for quite some time competing for dominance. Thereafter we returned to camp for an evening braai under the stars. The  piri piri chicken was certainly spicy but went down well with a couple of glasses of red wine....

On Sunday morning we were up bright and early and heading along the S100. There they were! Two massive male lion walked out of the bush just in front of our car and crossed the road.

One of the large male lions crossing the road in front of our car.

We were treated to a wonderful private viewing. We switched off the car engine and watched them walking silently down to the river for a good drink.

At 9:30am I had a QSO with Monk ZS4SF. He was using a vertical half wave. His signal was definitely down (559). But he had worked some PY (Brazil) stations earlier. This is definitely a DX antenna.

We then headed for Pretoriuskop camp about 150 kms to the south, stopping for a pie and ginger beer lunch near Skukuza atop a granite outcrop 'called a dwala where we come from' with a 360 degree spectacular view of the veld.

Pretoriuskop and the surrounding bush has a much different feel to Satara. This being thick bush with fewer game. Ideal Rhino country. We checked into a rondavel with a great view of an open space area looking towards the swimming pool which is built into the side of a granite outcrop. Most picturesque.

My end fed antenna here was excellent. Completely in the clear. A sloper configuration. One end at 20ft and the other at 8ft. The band at 06:15 pm was in good shape with 569 reports received from Barrie, Bruce ZS6BK and Evert ZS6AQW (599). Evert  was using a fb older rig which I believe was a Halicrafters but not completely sure. QRM was high but the band was open for mid-distance 500Km QSO's with no problem.

Lamb Chops Sunday evening. Oh how we will miss South African lamb chops when we return to the USA!

On Monday April 21st I was up early, before the sun, listening to DX. Initially South America and then North America as the sun was rising. By 7 am the band was short enough that I was able to establish excellent contact with Peter ZS1JX in Cape Town (559/QSB), Barrie and Monk. We were surprised that the band was so good so early in the day.

End Fed Half wave wire at Pretoriuskop camp. In the clear and high
After an excellent hearty breakfast of roosterkoek, bacon and eggs at the outdoor bush restaurant I spent some time optimizing my antenna. I was able to get both ends up above 20 ft and completely in the clear. Judging by the 589 reports from Monk ZS4SF, this was a superior antenna. We spent about an hour comparing signal strength's from ZS4SF as he tried different lengths of end fed wire on 40m. The conclusion was that a true half wave of 66ft 4 inches yielded marginally better results when compared to a better balanced 61 ft antenna. This was an interesting set of experiments.

The view from our hut at Pretoriuskop


 At 11 am om Pierre ZS6A gave me a 579 report. It was nice to talk to Pierre again.

After a leisurely time spent swimming and exploring the camp I was QRV at 3pm. QSO's and good signal reports were made with Eddie ZS6BNE who was running 15 Watts, and another round with Monk. Thanks chaps!

Our evening game drive was fully rewarded when we came across two young male elephants fighting for dominance right in the middle of the road. We spent about 30 minutes watching them clash and push against each other in a show of strength. Eventually one of the young elephants stormed off into the bush and started to push over a number of small trees as if to emphasize his superior strength. At one point we were obliged to reverse the car to give then space. Certainly we had never experienced anything like this before.

That evening back at camp I enjoyed my contacts with Eddie, Evert and Monk before a dinner of braaied borewors and a glass (or two) of good red South African wine. Good night...

On Tuesday morning after a relaxed breakfast we set out for our final destination in the south of the park near Malelane Gate. A camp called Berg en Dal. We had about 60 kms to drive. Soon we were amongst a large group of elephant feeding on the lush vegetation.What a pleasure it was to watch these majestic creatures going about their daily routine in their own habitat.

By lunchtime we had arrived at Berg en Dal. Here in this lovely wooded camp we had the pleasure of meeting up with my brother Ed and his wife Linda. We spent an enjoyable few hours catching up on news while we sat in their caravan camp overlooking a large river. 

I deployed my antenna into some nearby trees and reasonably in the clear. Up about 20 ft. and sloping down to 15 ft. I received a good signal report from Monk before we headed out for our evening game drive.

We could not believe it when a young Leopard casually walked out of the bush in front of us and ambled down the road to the drift crossing the river below. What a magnificent sight! We crept down the road to obtain a second glimpse before the leopard was gone. This was the first time Berry and I had seen a leopard in the wild. Memorable indeed.

On returning to camp I had a nice chat with Barrie and Monk at 6pm. Excellent band conditions once again.
After an enjoyable evening with Ed and Linda we crept into bed for our last night in the bush. Hyena could be heard throughout the night calling from somewhere deep in the bush. When would we hear that sound again?

I awoke early on Wednesday, our final morning. It was still pitch dark when I called CQ. To my surprise I was answered by Adrian ZS1TTZ at 05:45am (439). The band was wide open to Cape Town and Welkom! After an enjoyable chat with Adrian and Monk, Ed and I were at the gate by 6 am for another early morning drive. This time we were rewarded by the sight of three Rhino sleeping side by side sardine fashion and a Hyena standing quietly by the side of the road. Surely the litter must have been nearby. 
What a lovely end to a wonderful trip!

Hyena near Berg en Dal
Rhino sleeping 'sardine fashion' at Berg en Dal
Our hut at Pretoriuskop

  

The operating position at Berg en Dal
A kudu bull with a large pair!

Pretoriuskop

The little table is perfect for QRP operations and can easily be moved around



My lovely wife Berry. How can I ever thank her for her tolerance of my hobby :)


QRP Field operations. Lessons learnt from the Kruger trip and many other field trips

Herewith in this blog are some of the practical lessons learnt on the Kruger trip and other field operations during my time in South Africa. These observations pertain to the deployment of a end-fed wire halfwave (#18 awg) and a counterpoise of 8ft 6 inches in length and the use of a tunable tank circuit as the coupler.

These comments relate to a simple operation where the aim is to get on the air easily in order to make local (South Africa wide) contacts and then to take down the system easily and quickly after a day or two of operations. It is assumed that a minimum system has been packed with very limited spares. In my case my whole station plus antenna and accessories easily fitted into a plastic container the size of a shoe box. Refer to my previous blog showing pics of the packed station.

For this type of deployment it is absolutely NOT necessary to try to get the wire up more than 15 - 20 ft in the air. Attempting to get it higher will almost guarantee difficulties in the form of multiple launch attempts, tangled cord and wire, frustration, and if it goes really badly, the loss of the whole antenna system.
  1. Be very patient when un-winding the cord and antenna wire. The total length of my 40m system is 66ft of wire with a 60 ft cord attached. If you let this get in a tangle then it can take another 20 minutes to un-tangle it. I wind this up over one hand and turning the wrap around every 10 winds or so to prevent it twisting. This can be easily un-wound by releasing each turn carefully. Once the wire and cord is lying on a nice bare piece of ground, make certain that the coils are laid so that the end of the cord is at the 'top of the pile.' It will then uncoil during the launch without incident. Use slippery plastic cord as found in the hardware store. 
  2. Make sure that the end of the wire that will connect to your radio is fixed before launching. Preferably tied to a convenient tree branch about 8ft above the operating position. Here I am assuming that the most likely deployment will be a sloper with one end up at 20ft and the other end up about 8 ft. Trust me it is no fun to watch the whole system end up in the tree. Been there done that!  
  3. If an error is made in the launch and you need to retrieve the cord then disconnect the weights before pulling the cord back through the tree. Do this every time and don't take a chance. The weights will hang.
  4. Consider a spare set of detachable weights. The chances of hanging in a tree are extremely high. The most likely is a situation where the weight and cord does not drop to the ground after the launch. Now you are forced to retrieve the cord by pulling it back through the tree. Very often the weights will snag in the 'Vee' of a branch joint making it impossible to retrieve. A good strong cord is an asset in this case because heavy pressure can be applied in an effort to try to dislodge the weight.  
  5. Spend time and be patient in carefully selecting the tree to launch over. Preferably launch over a tree as opposed to trying to select a specific branch. The tree is much easier to aim for. An ideal launch tree would be about 25 ft high. Select a tree that has smooth branches and few leaves if possible. Do not select an Acacia thorn tree! Optimize the tree selection taking into consideration the fact that you want to be QRV quickly, you want the weight to drop to the ground and you want to be able to easily recover the wire and cord after the operation.
  6. 1.3Ah battery easily lasts a week provided it is in good working order. I had many lengthy QSO's during this 5 day trip. This assumes the use of minimum power on 40m. In my experience it is easily possible to make regular QSO's throughout most of the day on +500km path lengths using 1.5Watts output power maximum. Refer to the battery power measurements below.
  7. Try to get as much of the antenna up in the air and horizontal to the ground. Ideally both ends at 20ft above ground between two trees. An inverted L with 46 ft horizontal and 20 ft vertical. It is amazing how much this configuration improves the signal strength. This is why I carry two cords. The same set of weights can be used to deploy each cord.
  8. Put some plastic putty over the joint between the cord and the antenna wire. This will allow it to glide through the tree easier.
  9. When laying the 8ft counterpoise along the ground be sure that it is not a safety hazzard. It is easy for people to trip over this wire.
  10. Pack away the radio and accessories each time after use. Leaving it set up is an invitation to the monkeys to pull the counterpoise and to try eating the battery.
  11. Take a small portable plastic table. One of those small green ones. They pack easily in the boot and allow the operating position to be set up comfortably under a tree. It can also be moved as the sun position changes.
  12. Consider using a length of coax between the radio and the tuner to avoid RFI issues. I certainly experienced RFI/common mode on this trip on one occassion when I had the tuner directly connected to the radio. I believe the end of the wire and tuner were too close to the radio.
  13. Build the coupler with a link switch so that you can connect the coax/ground to the counterpoise end of the secondary coil. Sometimes this will improve the match. Sometimes it will cause RFI.
  14. Make the coupler tunable with a small variable capacitor. The resonant point can change by up to 30pf depending on deployment conditions.
  15. If possible try to get the wire in the clear. However if it has to snake through the tree it will still work fb and no problem.  
  16. If possible have a variable power output rig so that when conditions are good you can reduce power and save battery. In South Africa the rig only needs to operate on a single frequency of  7020Khz CW. A simple DC Rx can be used with RIT and an attenuator. BCI is not an issue during daytime operations, however it is an issue during early evening unfortunately.   
  17. Always carry a Leatherman of Swiss Army type knife. Preferably with one of those spikes that used to be used to take stones out of horse's hooves. This spike can be used to loosen tight knots. The knife blade is useful for cutting off snake's heads and for general defense.
  18. Wear a hat and stay hydrated.
  19. Look after the XYL and the kids.
  20. Enjoy!

Audio Record by Jan ZS6BMN. Thanks Jan!

Audio Record by ZS6BMN.

Transcript of email received from Jan ZS6BMN.

"Hello Dick,
It was good to hear this morning that you were safely back in Fourways :-)
I have followed your Kruger Park trip/adventure all the way (with atllas and maps too) and it was obvious that you were enjoying the Park, the game and the QRP operation tremendously! Thank you for all the interesting CW operation from the Bush. I cannot recall when last there was such a lot of CW activity on 40m and also never realised how well the band was performing over these medium distances early in the evenings. Your 1.5 W Norcal did a sterling job and has often peaked at S9 on my simple setup with the small indoor whip antenna and TS-140S. Just a great pity that I was without an antenna as I have heard you calling CQ when nobody else was around and you thought that you were not getting out. Still, I have enjoyed listening and must thank you for again for providing such a lot of listening pleasure and for giving QRP operation so much positive exposure! You have even managed to get my old friend Evert to operate 40m after dark :-) BTW: I have listened on the little Rebel to his last QSO with you and then his signal was the first CW signal that could register a reading on that set's stingy S-meter - all of S2, but the reception was great and I could even hear the DX in the background. The Rebel was set up with the single band whip in the dining room while I also had the TS-140S running in the 'shack'.
I have a great recording of your first early evening's operation with Monk, Barrie and Dave all calling in. Later that same evening OM Monk, OM Peter, ZS1JX, and you were calling at different times on the same QRG and just missed each other. At that time OM Monk was putting in the strongest CW signal that I have heard to date and it has sounded like FM with 100% quieting! I have had a lucky break in that the noise was completely gone that day and the S-meter was idling at S1-S2 on background noise.
So all-in-all in the terminology of "1066 and all of that" your enjoyable weekend in the Park has been a 'good thing' for many others as well :-)
73 for now!"

BATTERY AND RIG TEST MEASUREMENTS

MEASUREMENT                            START OF TRIP                     END OF TRIP (after 5 days operations)        
Battery Voltage Radio OFF                   13.01V                                        12.3V
Battery Voltage Radio ON                     12.99V                                        12.22V 
Battery Voltage KEYDOWN                  12.75V                                        11.92V
Current RX                                           19.9mA                                       19.9mA 
Current KEYDOWN                                                                                 190mA
Power Output                                       1.58W                                          1.4W

NOTES: Measurements taken at 7020KHz with Keithley multimeter and AD8307 Power meter using a 36dB attenuator.





19 April 2014

Kruger Park Satara Camp

Here we are at the lovely Satara camp. The 569Km drive here from Joburg was quite uneventful in spite of the heavy traffic and packed facilities. This being Easter weekend. Our self catering bungalow is basic but very clean and pleasant. We are in a circle of rondavel huts numbering some 25 with a nice green space in the center with many trees.

Of course I had to deploy my antenna upon arrival. A single launch had the EFHW over  a strong branch about 20ft high. A non-thorn tree! Soon I was QRV using my Norcal 40A at 1.5 Watts. The following in my log:

LOCAL   RST (R)  RST(S)    CALL
17:08         599         599        ZS4SF  Monk in Welkom indicating some QRM but a FB signal
17:20         599         599        ZS6AZP  Dave in Centurion indicating rising QRM
17:30         549         599        ZS6AJY   Barrie in Benoni / QRM

The band was definitely going long and an hour later I was unable to make a QSO as I heard european stations coming in. The reports received were very satisfying, convincing me that the system was working ok.

After a delicious braai of short ribs and salad we retired for a good night's sleep.

LION SPOTTED!
This morning we were up bright and early before sunup and joining the queue of vehicles waiting for the gates to open at 6am. We headed for the famous S100 road where there are purported to be a large pride of lions in residence. Yes we were lucky! Right there walking alongside the road were a beautiful lion and lioness. This was certainly the highlight of the morning for us. What a memorable sight to behold in the golden morning sunlight.

We stopped at a nice picnic spot where we rented a 'skottle' with which to cook our breakfast consisting of eggs. tomato, fried banana and tea.

What a great start to our Kruger trip..

Picnic spot near Satara camp and overlooking Mozambique



17 April 2014

Kruger Park Easter April 17th - 23rd

This coming weekend we are excited to be going to the Kruger Park.

We will be in the park from the afternoon of Friday April 18th through the morning of Wednesday 23rd. We will stay in self catering accommodation at Satara, Pretoriuskop and Berg en Dal. This should be fun!

I am taking along my QRP 40m station as stored in a plastic food container, including my end fed halfwave system. I do hope that I will be able to make a few CW QSO's with my CW friends.

Thank you in advance for trying to work ZS6RSH.

I will take my laptop along and thus I plan to post blogs covering our experiences at the park.

Details of my working conditions as follows:

OPERATOR: ZS6RSH
QTH's:      April 18th evening - April 20th morning SITARA
                 April 20th afternoon - April 22nd morning  PRETORIUSKOP
                 April 22nd afternoon - April 23rd Morning BERG EN DAL
OPERATING TIMES  Noon 12:00-1:30,  Early evening 18:15-19:00, Other casual times.
QRG: 7020KHz
MODE: CW
RIG: NORCAL 40A, 1.53 Watts
ANTENNA SYSTEM: End Fed Half Wave (66' 4") + Tank coupler + 8" 6" Counterpoise
PADDLES: Palm field model
POWER: 12V, 1.3Ah SLA, Car Battery power as backup

------------------------
List of Equipment:

  1. Plastic Food storage container
  2. Norcal 40 A, 1.53 Watts output, QRP, 40m Rig. 
  3. Granadila Tin homebrew end fed half wave coupler
  4. LED SWR Meter
  5. Palm Paddles
  6. 66ft 4inches, #16 AWG, 40m Halfwave antenna, with launch cord attached.
  7. 8ft 6inch Counterpoise
  8. Launch cord with 3 fishing weights attached
  9. Spare cord (20ft)
  10. 2 X BNC barrel connectors
  11. SLA Battery, 12V, 1.3Ah
  12. SLA power cable and 2A fuse
  13. Car Battery extension power cable
  14. 2 X 2A fuses
  15. Keyline
  16. Earphones
  17. Leatherman
  18. Mini Multimeter, Radio Shack
  19. Plastic tuning screw driver
  20. Pen
  21. Paper
  22. Operator ZS6RSH 
Some interesting links:


Kruger Game Park.  http://www.krugerpark.com/

Satara Camp http://www.krugerpark.com/self-catering/satara-restcamp/
           GPS :-24.3976800 (latitude), 31.7777800 (longitude)

Pretoriuskop Camp http://www.krugerpark.com/self-catering/pretoriuskop-restcamp/
           GPS: -25.1722 (latitude), 31.2692 (longitude)

Berg En Dal Camp http://www.krugerpark.com/self-catering/berg-en-dal-restcamp/  
           GPS: -25.4200(latitude), 31.4512 (longitude)