Welcome to Tropical band

To most people the phrase "tropical bands" bring a pretty clear picture to mind - a bunch of shirtless guys playing calypso music. But to experienced shortwave DXers those two little words express the most challenging and enjoyable part of the radio hobby. The phrase kindles memories of a DXer's best catches and favorite QSLs, of exotic stations, music and of early morning listening sessions. (Don Moore)
I like the "Tropical band" name for new 60m allocation. (OK1RP)

Effective from 1st Jan 2017 please paper QSL via OM-bureau only.

Wednesday, September 20, 2017

Upcoming DXpeditions...

Hi all,

there are the upcoming DXpeditions possible to find them also on 60m...

CT9 - Madeira island Sept 17 -27

Burkina Faso - XT2AW BY DF2WO, Sept. 29, to Oct. 30. QSL to M0OXO

H40 - TEMOTU PROVINCE H40GC Sept 30, to Oct. 30

KG4 - Guantanamo Bay Oct 6 for 2 weeks

3Y0 - BOUVET ISLAND: From their website

The January-February, 2018 3Y0Z Bouvet Island DXpedition team has posted a propagation page on their website (http://www.bouvetdx.org). It has videos showing propagation predictions for that early 2018 timeframe. The tab for the propagation is in the header menu. You can choose time, frequency and signal strength for your QTH. This is based on the average sunspot numbers forecast for January, 2018.

More information can be found here by Joe, W8GEX.

73 - Petr, OK1RP

Sunday, September 10, 2017

ARES Teams in Three West Central Florida Section Counties Ready to Support Shelters

ARES Teams in Three West Central Florida Section Counties Ready to Support Shelters

As Hurricane Irma moves closer to the Florida Peninsula, ARRL West Central Florida Section Manager Darrell Davis, KT4WX, reports that Amateur Radio Emergency Service (ARES) teams have been requested to provide communication support at evacuation shelters in Highlands, Hillsborough, and Polk counties.

“Other counties in the West Central Florida Section are considering shelter operations,” Davis said. “Therefore, in support of these activations or planned activations, West Central Florida Section ARES is going to a Level 2 activation to provide any needed support for these activations, either current or planned.”

As of 1500 UTC, Hurricane Irma was about 75 miles east-northeast of Puerto Plata, Dominican Republic, and about 120 miles southeast of Grand Turk Island. Maximum sustained winds have abated somewhat to 175 MPH. The storms present movement is west-northwest at 16 MPH.

The National Hurricane Center (NHC), has issued a hurricane watch for the Florida peninsula from Jupiter Inlet southward and around the peninsula to Bonita Beach, including the Florida Keys, Lake Okeechobee, and Florida Bay. A storm surge watch has been issued for the Florida peninsula from Jupiter Inlet southward and around the peninsula to Bonita Beach, including the Florida Keys.

A hurricane watch means that hurricane conditions are possible within the watch area. A watch is typically issued 48 hours before the anticipated first occurrence of tropical-storm-force winds — conditions that make outdoor preparations difficult or dangerous.
Davis called on all ARES, ACS, and CERT personnel to continue closely monitoring National Hurricane Center advisories on Hurricane Irma and to be in communication with their respective leadership, in case their assistance with communication support is needed.

Davis said a special session of the ARRL West Central Florida Section ARES Net was being planned.

73 - Petr, OK1RP

Carribean Emergency Response – Update [ IARU ]

Carribean Emergency Response – Update [ IARU ]

Hurricane Irma is currently progressing through the USA state of Florida and Hurricane Jose is still threatening the Carribean. At the same time Mexico is still dealing with the after effects of the Earthquake which affected that country earlier this week and the remains of Hurricane Katia. To add to the problems, an X8.2 solar flare is causing a major HF blackout in the Americas which will potentially affect communications until Monday (UTC).
As Hurricane Irma progresses through Florida there will be more HF frequencies in use by local ARES groups but these will lie mostly outside the IARU Region 1 band allocations ( West Central Florida planning to use 3940, 3950 and 7247 kHz for example ). More information on this should come from the ARRL .
Updates to frequencies in use are;

7060 and 7080 kHz to deal with the Earthquake and Hurricane Katia

St. Maarten
14290 and 7190 kHz ( Voice or PACTOR )

US Wide Area traffic handling
14115, 7115 and if necessary 10115 kHz ( all CW )

Carribean Emergency and Weather Net ( CEWN )
3815, 7188 and possibly 7162 kHz

FNRASEC in France are reaching out to French speaking areas in the Carribean on 14132kHz.

As Irma moves away from the Carribean islands, Radio Amateurs are entering the area to help. The Red Cross asked for assistance on Sint Maarten where communications had been badly affected. Tom Braam PJ2DD volunteered for this task and left September 8th on one of the first relief flights to Sint Maarten with a Pactor HF station and 9 VHF/UHF handheld radios to start providing communications. Frequencies in use are as above.
Enquiries about persons in the affected areas should be referred to the various Red Cross websites set up for this purpose. ‘Welfare’ messages from outside the area are not expected to be handled for at least three days, with thousands of displaced people, locating them for message delivery is difficult.
As always, please listen carefully and avoid causing QRM to frequencies in use for distress and emergency traffic. The operators in the affected areas already have a difficult job, please give them as much room as possible to work.



As we are worrying about all of our mates from Caribbean isles and close to FLA, GA... please let us know how you survived Irma hurricanes and if you and relates are ok!

Please let me/us know if we can help somehow! Do not hesitate to ask for help or support by email or ham radio...!

73 - Petr, OK1RP

Tuesday, September 5, 2017

FEMA Announces Regions that Could Activate on 60-Meters for Hurricane Irma !

FEMA Announces Regions that Could Activate on 60-Meters for Hurricane Irma

The below listed Federal Emergency Management Agency (FEMA) Regions, including call signs, could be activating the 5 MHz/60-meter band frequencies in support of a possible response to Hurricane Irma on September 5.
  • Region 1 — KF1EMA
  • Region 2 — KF2EMA (includes Puerto Rico and US Virgin Islands)
  • Region 3 — KF3EMA
  • Region 4 — KF4EMA
  • Region 6 — KF6EMA
  • Maynard MERS — NF1EMA
  • Thomasville MERS — NF4EMA
  • Denton MERS — NF6EMA

The following suppressed-carrier reference frequencies, also known as dial frequencies or window frequencies, 5330.5 kHz, 5346.5 kHz, 5357.0 kHz, 5371.5 kHz, and 5403.5 kHz, may be used as part of the event. FEMA POC:

KG4BIR, FEMA Spectrum Manager, (540) 272-4605.

73 - Petr, OK1RP

Thursday, August 31, 2017

5Z - Kenya gets 5275 – 5450 kHz allocation at 400W PEP!

Hi all,

following a request from the Radio Society of Kenya (RSK), Kenya state radio regulator, CAK (Communications Authority Kenya) advised the RSK that a new 60m allocation has been granted between 5275 kHz and 5450 kHz on a secondary basis. All modes are permitted with a maximum power of 400W PEP.

Tnx: Paul, G4MWO, 5Z4XB, 5Z4NU, VK3XXX, CAK

Kenya National Frequency Allocation Table (p.52)

Kenya is considered by many to be the safari epicentre of the world as the country contains some of the greatest varieties and concentrations of wildlife on Earth. Kenya hosts the “Big Five” which consists of the lion, elephant, rhinoceros, buffalo and leopard. The “Big Five” was a term coined by hunters to encompass the most difficult and dangerous animals to hunt as well as the most desired trophies.


UNESCO has listed three Natural World Heritage Sites in Kenya, they are Mount Kenya National Park, Mijikenda Kaya Forests and Lake Turkana National Park. Along with these World Heritage Sites are over fifty national parks and reserves that account for more than 17,000 square miles or 8% of Kenya’s total landmass. These areas include many different ecosystems like forests, wetlands, savannahs, marine and arid and semi-arid regions. There are 23 terrestrial national parks, 28 terrestrial national reserves, 4 marine national parks, 6 marine national reserves and 4 national sanctuaries. Parks offer complete protection of natural resources and the only activities within them are for tourism and research while reserves allow certain human activities under specific conditions (ie. fishing in a marine reserve).

Along with the designated parks and reserves, Kenya Wildlife Services (KWS) also maintain a further 100+ field stations and outposts outside of the protected areas. These are incredibly important because much of Kenya’s wildlife lives outside of protected areas as they are not fully fenced. Wildlife therefore moves in and out looking for new pastures and water throughout the year. This can cause problems as the wildlife sometimes has interactions with people on private and community lands. To aid this, Kenya Wildlife Services works with communities to educate them on the effects of human/wildlife conflicts and to prevent such conflicts in the future. The main goals of the KWS are to enhance wildlife and visitor security, to minimise human/wildlife conflicts, to support community conservation initiatives and to complete research.


Kenya is famous for the Great Migration which witnesses millions of animals travelling through the Maasai Mara Reserve to the Serengeti in search of greener pastures. It is estimated that around 1.3 million wildebeest, 200,000 zebras and 18,000 eland antelope make the journey annually. Over 250,000 wildebeest die each year as a result of drowning, from general weakness, attacks by predators or from injury due to the stampede. Despite this massive loss, there are still nearly 400,000 calves born each year. The Mara River is considered to be one of the best places to truly experience the Great Migration in action.

Apart from the “Big Five”, Kenya is also home to gazelles, impalas, antelope, zebras, wildebeest, waterbucks and Maasai giraffes. Cat families include cheetahs, the smaller serval, civets and the caracal. Primates in Kenya include olive and yellow baboons as well as colobus, vervet and golden monkeys.

More than 1,135 bird species inhabit the country including the world’s largest bird, the ostrich, and one of the smallest, the sun bird. Interestingly, Kenya also hosts the “Little Five” which is made up of the ant lion, the elephant shrew, the rhinoceros beetle, the buffalo weaver and the leopard tortoise.

The entire World has the impession that Kenya is dominated by violence. The truth is different. Lets show the world their Beauties of Kenya … and they have many of them...

73 - Petr, OK1RP

Sunday, August 27, 2017

ES - Estonia on 60m band By Arvo, ES1CW


The 60m will became available in regular basis to Estonian (ES) class A and B amateurs on September 1st 2017 by local time (= 21 UTC Aug 31’ 2017). Band segment and max allowed power according by the last ITU rules: 5351,5 to 5366,5 kHz, max 15W EIRP. We have possibilities to use also freq segment 5370-5450kHz with max power 20dBW (100W) TX output but unfortunately so far only on special permission base and only for local rescue communication.
De Arvo/ES1CW, c/o ES9HQ

(Tnx info Joe, W8GEX)

Estonia is a dreamland for nature lovers. This is the place where the land meets the sea, bogs are interspersed with virgin forest, fields  and rivers and lakes. Estonia might easily be called the kingdom of bogs  since approximately one quarter of the country is covered in marshes. From any point on Estonia’s mainland, the nearest marsh is al-ways less than 10 km away.

Altogether, five national parks and hundreds of other preserves have been established to maintain nature’s unique value. Estonia is considered one of the world’s best bird-watching destinations due to its prime fly-way location. We have low human population, empty roads and good infrastructure. It should be also noted that Estonia’s low population density offers nature-loving adventurers plenty of space to themselves. The mobile telephone and internet reception found all over the country enables communication with the rest of the world in the most remote locations: isolated beaches or deep in the forest.

Our nature offers yearlong opportunity for nature watching. Temperate climate rules here between the continental and maritime climate, a diagonal line between the limestone-base and the slightly poorer sandstone, in addition we also lie on the Southern border of the coniferous forest zone.

Estonia has untouched beaches, more than 1,000 small islands, heritage landscapes, primeval forests, swamps, bogs, winding rivers with natural riverbeds which are all habitats for many rare species of animals and birds.

Estonia is situated on the East-Atlantic migratory path of Arctic waterfowls, every year millions of waterfowls travel through our coastal waters. What is more, our western taiga forests are especially rich in species. Estonia is, for example, one of the few countries in Europe where it is possible to observe eight different species of woodpeckers. In addition to that, you can meet a lot of galliformes here e.g. the Hazel Grouse, the Capercaillie, and the Grouse.

A lot of such species that cannot be found anywhere else still inhabit our forests. For example, the flying squirrel who can only be seen in Estonia and Sweden. Our forests are made even more fascinating by the mammals living here e.g. lynx, wolf and bear. The lynx and the wolf can be seen during any season but the best period for bear, beaver and elk-watching is from April to September.
Our coastal and wooded meadows are no less important than the forests. It is common to see such plants in these places that have become extinct or rare in the rest of Europe. For example, 76 species of vascular plants were counted in the summer of 2000 on the wooded meadow of Laelatu. This makes Laelatu special in the whole world and it is also a record in North-Europe.

73 - Petr, OK1RP

Wednesday, August 23, 2017

Canada proposes to add 5 MHz and to keep five existing domestic channels !

Canada proposes to add 5 MHz and to keep five existing domestic channels

The Government of Canada has just released a consultation document to implement the changes from World Radio Conference 2015 (WRC-15) including 60 metres. Note that these are in addition to continuing the domestic allocation of five channels congruent with the United States.

The announcement was made in Gazette Notice SMSE-005-17 which can be found at:http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf11254.html

The consultation document “Proposed Revisions to the Canadian Table of Frequency Allocations (2017 edition)” is available at: http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf11306.html

The consultation is the first step in the process for regulatory changes. After the 60-day period, responses are tabulated, made public and the regulator Innovation, Science and Economic Development Canada (ISED) then determines how to proceed – with no fixed schedule it can be months or much longer.

Please note that even when these are added to the Canadian Table of Frequency Allocations, until RBR-4 – Standards for the Operation of Radio Stations in the Amateur Radio Service RBR-4 (regulations for Amateur Radio) is updated to include them, they would not available for Amateur use.

I hope this may be helpful to us to use as an example to other International Amateur Radio Union (IARU) Region 2 countries to convince them to both keep any existing 60m domestic allocation and add the ITU allocation as well.

73, George Gorsline, VE3YV
RAC International Affairs Officer
International Amateur Radio Union Region 2 Director Area A


73 - Petr, OK1RP

Wednesday, July 26, 2017

DU - DXCC #74 on 60m band CW only...


I am so happy to report over here that #74 DXCC on 60m band CW only I worked few days ago on 22/7/2017. How it was achieved? ...hard but finally done.

I tried to hear George, DU1GM for several days on 60m band and sometime I was able to copy his sigs on JT65 around 5357kHz. As I am operating CW only I asked for QSY to CW and our trials has been started.

Unfortunately propagations was against from the beginning...

When I tried to call George on desired frequency at around 19Z I was a bit surprised that he was able to hear me but it was very hard to copy my sigs and mainly I did not hear from George more that just few beeps in high noise at around S5.

Simply I had still lot of light outside so in my opinion it was too early for my QTH unfortunately.

After that I realized that I am using the short vertical towards the dipole at 20ft on the George's side. George is having also the choice of the vertical and dipole antennas but it looked like there is no gain from the vertical usage so we decided to use dipoles on both sides mainly cause of lower noise level on these antennas.

Also we had to postpone our trials a bit in order to gain more from my Sunset in QTH so we started at around 19:30Z next days.
Unfortunately the noise level on my side even using the Inverted V dipole at the center of post stamp lot garden about 10m high was still around S3... so it was nightmare to copy sigs from DU.

I decided to prepare for another day special configuration of my QTH. I switched all equipment at home OFF by main breaker and tried to listened just using the battery powered K3 and external RX loop antenna Mini-Diamond, W2PM.

Bingo, I was able to read sigs from George, DU1GM at my QTH and copy him enough for trial QSO. The problem was that propagations has changed a bit down and my sigs were copied by George really hard.

Even although George suggested to postpone all tests again for next day (he had 4:30 local time...) I tried to call him again and again.

I was really surprised when I got the call back and copied his report. I copied his 419 for me for the first time but I was not sure with that so I gave him my report and asked to repeat my RST again.

For second time I copied his 419 for me quite clear and at the peak I copied his regards as same as 73 and both call-signs at the end of our QSO. So I repeated the same from my side and his third part for me was again readable perfectly. I heard even the well known and commonly used friendly "dit dit" at the final.

My god, I worked Philippines on 60m band using my very moderate setup even although George is using just low profile dipole and WRC-15 horrible power limit...!

When we postponed the time of trials to 19:30-20:00Z we reached the SS/SR gray line phenomenon on both sides so it helped a lot I guess.

Many thanks to George, DU1GM for his effort and excellent operating skills. My DXCC #74 only CW on 60m worked...

73 - Petr, OK1RP

Monday, July 3, 2017

DU - Philippines on 60m band by George, DU1GM

Hello all,

Philippines regulators have now granted access for amateurs on a secondary basis to 60m commencing July 7 2017. Band as per IARU R3 5.3515MHz to 5.3665MHz. No further information, power levels etc. Presumably as per IARU R3 15W eirp.

"I have already received some EU stations on the band in the past few months using JT65a and will be QRV on opening day here!
de George, DU1GM"

(Many thanks for good news to George, DU1GM)

Philippines nature attractions are a chief reason why tourists will fly from all over the world to this archipelagic country to see nature at its best.
In a country whose diverse beauty is a primary attraction, it becomes important to establish the type of location you would like to visit. This is because with more than seven thousand interconnected islands, it is obvious there is a wide variety of natural attractions.

Take on the volcanic mountains and go for a nature trek. Spectacular views, breath-taking scenery and simply the adventure of taking on Mother Nature. One of the most popular mountains to go trekking is Mount Pinatubo, best known for the second biggest eruption in 1991.

Another popular option for travellers wondering what to choose from in the list of Philippines nature attractions is the sheer number of gorgeous rivers. The Puerto Princesa Underground River (PPUR) in Palawan. This river is included in the list of New Seven Wonders of Nature, thanks to its intricate cave systems and length that spans 5 miles to the sea.

The number of islands is mind-boggling, but you cannot afford to tour Philippines and not experience Boracay Island. The 2.5 mile stretch of coastal strip is home to lavish establishments from where you can enjoy the natural scenery on the island.

The hilly Chocolate Ranges are also a delightful experience. The hills are one of the world’s Famous Natural Attractions, and the symmetrical cone-shaped hills that spread to the horizon make it easy to see why.
With so many islands and Philippines nature attractions, it is understandable why the country is home to numerous marine reefs. One of the most prominent reefs is Tubbataha Reef situated in the Sulu Sea. The marine sanctuary is also home to diverse bird species, so bird watchers are set to enjoy the treat of a lifetime.

73 - Petr, OK1RP

Tuesday, June 13, 2017

6Y - Jamaica has access to 60m band

In a recent update to their National Frequency Allocation Table published by regulator the Jamaican Spectrum Management Authority (SMA), the WRC-15 60m Amateur Secondary Allocation of 5351.5 – 5366.5 kHz has been granted under ITU Footnote 5.133B, which in the case of Jamaica means a maximum power of 25W EIRP.

Spokesman for the Jamaican Amateur Radio Association (JARA), 2nd Vice-President  Ivor, 6Y5DW, said that JARA is advocating use of the new IARU Region 2 60m bandplan.
Jamaica SMA National Frequency Allocation Table (p.8)
Jamaican Amateur Radio Association (JARA)
(Tnx: Paul, G4MWO, 6Y5DW, 6Y5HN, SMA, JARA)

More info on new Jamaica 60m  WRC-15 Allocation from their national society’s president to Paul, G4MWO:

Hi Paul, confirmation from our Spectrum Management Authority. Apparently any ruling which is made at WRC level immediately applies to Jamaica as we are a participating country in these matters.   Hope you can make a contact with 6Y as not many of us have 60 meter capability, but I am sure if you really want to have a try I will speak with some members who may be able to do something in this area.

Our Field Day is coming up on the weekend of June 23-25 where we will be setting up communications both voice and digital in the town of Port Antonio in the Parish of Portland on the North Eastern end of the Island. We will be operating  under the Jamaica Amateur Radio Assoc. (JARA) club's callsign 6Y5RA/p.  If you would like to make a 'sked' let me know. We can probably resonate an all band wire ant. somewhere within this "new" band. Nigel 6Y5HN.

Jamaica's biggest natural attraction is certainly its miles of coastline and visitors flock to white sand beaches around the island for relaxation, natural beauty, watersports and parties. The island is also home to more nude beaches than any other Caribbean island.

One of Jamaica's most famous offerings is Seven Mile Beach in Negril, which is considered one of the most beautiful beaches, although its occasionally aggressive vendors and nudity-friendly areas make it not for the timid.

Treasure Beach
Those looking for a more serene alternative should explore the south coast's Treasure Beach, a set of quiet fishing villages on six miles of shoreline that include Billy's Bay, Frenchman's Bay, Calabash Bay and Great Bay. Treasure Beach is known as much for its snorkeling, surfing and swimming as for its friendly residents, many of whom work as farmers or fishermen.

Miss Jamaica Universe 2011

The area is considered Jamaica's "desert coast" as it receives the lowest levels of rainfall on the island and the vegetation is markedly different here than elsewhere on Jamaica. Just east of Treasure Beach is Lovers Leap, where legend holds that a slave couple jumped over the 1,700-foot cliff to their deaths to avoid being separated.

Treasure Beach
Those looking for a more serene alternative should explore the south coast's Treasure Beach, a set of quiet fishing villages on six miles of shoreline that include Billy's Bay, Frenchman's Bay, Calabash Bay and Great Bay. Treasure Beach is known as much for its snorkeling, surfing and swimming as for its friendly residents, many of whom work as farmers or fishermen. The area is considered Jamaica's "desert coast" as it receives the lowest levels of rainfall on the island and the vegetation is markedly different here than elsewhere on Jamaica. Just east of Treasure Beach is Lovers Leap, where legend holds that a slave couple jumped over the 1,700-foot cliff to their deaths to avoid being separated.

YS Falls
YS Falls on the south coast is a series of seven waterfalls in a tropical forest; the falls boast the shortest place name in all of Jamaica and portions are open for swimming. Somerset Falls in Port Antonio and Mayfield Falls in the Glenbrook district with two falls and 21 mineral pools also welcome guests.

Green Grotto Caves
With their striking limestone stalactites and stalagmites, the Green Grotto Caves are worth a trip when visitors need a break from the sun. The caves have purportedly served as a shelter for the Arawak Indians (also known as the Tainos) who were early Jamaican residents, a haven for runaway slaves and a hiding place for arms dealers. They now play host to visitors who wander through passageways and take in the Grotto Lake, a subterranean body of water that guests can cross in boats during their visit.

73 - Petr, OK1RP

Monday, May 15, 2017

XE - Mexico 60m band allocation


The Mexican telecommunication regulator IFT - Instituto Federal de Telecomunicaciones has approved amateur radio operation on the new WRC-15 the 60m band allocation on secondary basis. The band is 5351.5 - 5366.5 kHz with maximum permitted power of 20W EIRP.

Mexican National Frequency Table is available here:http://cnaf.ift.org.mx/Consulta/Index

(Tnx: Paul, G4MWO, XE2O, FMRE)

It has miles of virgin beaches.Mexico has over 11,000 kilometers of coastline along the Pacific and the Atlantic, and in fact is one of the few countries in the world that has more coastline than land borders.

It has 10 times as many islands as Hawaii. According to the National Commission for Biodiversity, there are 1,365 islands scattered along the coast of Mexico. They amass an area of 5,127 km2, equivalent to 0.3 percent of the total national territory.

In most American films, Mexico appears as a desert country, full of ghost towns. However, less than 40 percent of the territory of the country is arid or semi-arid. The desert in Mexico is characterized by different types of cacti and drought-tolerant species and varies greatly in flora and fauna.

It is one the most bio-diverse countries in the world.Thanks to the heterogeneity of its terrain and the fact that it’s between the tropics, Mexico has a great variety of ecosystems. These range from high mountain cloud forests to sea bottoms abundant in coral reefs, deserts, and coastal lagoons. The territory has about 50,000 square kilometers of humid forests–equal to all of Costa Rica.

Throughout the landscape you find prehistoric ruins. As the center of hundreds of Mesoamerican cultures and civilizations such as the Maya and Aztec, Mexico, there are 187 archeological sites managed by the Institute of Anthropology and History, and still others yet to be discovered. In the Yucatan Peninsula there are more ruins than budget to unearth them (excavating a pyramid can take up to 20 years.)

The terrain is full of mountains. For some strange reason, people rarely associate Mexico with mountains. But note all the ranges: The Western Sierra Madre–essentially the considered the Rockies from the US and Canada–extends over 1,250 km from Sonora to Nayarit. Paralleling that is the eastern Sierra Madre range which spans 1,300 km from Texas to Oaxaca. The Southern Sierra Madre reaches from Jalisco to the Isthmus of Tehuantepec in Oaxaca. Finally, the jagged sierras of Chiapas and Baja California rise up through those statesas well.

73 - Petr, OK1RP