OK-OM DX SSB Contest [SSB | 160,80,40,20,15,10]


1. Contest sponsors
The Czech Radio Club, ČRK in cooperation with Slovak radioclub SARA is pleased to
announce  International “OK-OM DX SSB Contest – 2023“

2. Contest Period
second weekend in April,. i.e. 1200 UTC 8 April – 1159 UTC 9 April 2023

3. Categories:
· SOAB – Single Op, All Bands,
· SOAB Single Op, All Bands, Low Power 100 watts
· SOAB Single Op, All Bands, QRP 5 watts
· SOSB – Single Op, single band, (6 different band entries, separately
· 160, 80, 40, 20, 15, 10 m)
· MOST – Multi Op, All Bands, Single transmitter,
· MO2T – Multi Op, Two transmitters,
· SWL – Single Op, All Bands
All bands, 1.8 through 28 MHz, WARC bands excluded.
3.1 The participant can operate and enter in six different single band categories. This
allows a station, for example, enter seven cathegories for, ALL, 160m, 80m, 40m, 20m,
15m, 10m and all of them count towards awards.
3.2 Single Band entrants operating other bands during the contest are encouraged to
submit their logs for more than one band to aid in the log cross-checking process.
3.3 All entries separated by World, Europe, Czech Republic, Slovak Republic

4. General Rules
4.1. Transmitters and receivers must be located within a 500 meter diameter circle. All
antennas used by an entrant must be physically connected to the transmitters by wires
4.2. All categories of entrants are allowed to use packet and WEB clusters.
4.3. Using any IP net for the remote receiving, including web radiostations is
unsportsmanlike and the entry is subject to disqualification.
4.4. Self-spotting is not allowed. Soliciting contacts by telephone, telex, internet, packet mail
during and before the contest is forbidden.
4.5. Using other stations call signs for the following – keeping the working frequency on the
other bands, making schedules, DX-spotting, moving the multipliers to the other bands – is
4.6. Single Operator participants may change bands and modes without restrictions. Only
one signal can be transmitted at any given time.
4.7. Single Operator: Those stations at which only one person performs all of operating,
logging, and spotting functions.
4.8. MOST stations are limited by “10 minutes” rule. Start time is determined on the first
QSO made on that particular band. Only one signal can be transmitted at any given time.
Exception: two signals on different bands are allowed if and only if the station on another
(only one) “multiplier” band picked up a new multiplier. This “multiplier” band should also be
changed on “10 minutes” rule. Contacts, violating both rules, should be shown in the log,
they will neither be counted nor penalized for an entrant, but counted for the station
4.9. MO2T (Multi Op, Two transmitters): A maximum of two transmitted signals at any time
on different bands. Each transmitter may make a maximum of 8 band changes in any clock
hour (00 through 59 minutes). For example, a change from 40 meters to 80 meters and then
back to 40 meters constitutes two band changes. Both transmitters may work any and all
stations. A station may only be worked once per band.

5. Exchange:
5.1 Non-Czech and Slovak stations: signal report + QSO number, starting with 001.
5.1.1 MOST (Multi Op, All Bands, Single transmitter) can use separate serial numbers for
each band or chronological serial numbers.
5.1.2 MO2T (Multi Op, Two transmitters) MO2T (Multi Op, Two transmitters) can use either
separate serial numbers for each band or separate serial numbers for each transmitter.
Each QSO in the submitted log must have transmitter identifier.
5.2 Czech and Slovak stations: signal report + County code (three letters).

6. QSO Points.
6.1 Czech and Slovak station:
· QSO with your own country – 2 points,
· QSO with a different country on your continent – 3 points,
· QSO with another continent – 5 points.
Remark – OK – OM QSO is different country i.e. 3 points.
6.2 Non-Czech and Slovak stations:
· QSO with Czech and Slovak station – 10 points,
· QSO with your own country – 1 points,
· QSO with a different country on your continent – 3 points,
· QSO with another continent – 5 points.
6.3 /MM stations are not the multipliers, but worth 5 points for any participant.
6.4 SWL stations must copy one or both exchange numbers, points are scored on
common rules.

7. Dupes
7.1 Dupes are contacts made with the same station on the same band. If the first contact
between stations is valid, dupes have 0 points value. If the first contact is not valid, second
(dupe) contact is accepted.
7.2 Dupe contacts should not be marked in the log. Moreover, entrants are strictly
recommended to leave DUPES in the log file. DO NOT DELETE DUPES!

8. Multipliers
Two types of multiplier will be used:
· A multiplier of one (1) for each different Czech and Slovak counties contacted on each
· A multiplier of one (1) for each different country (DXCC entity list + WAE multipliers list)
contacted on each band.

9. Final Score
All stations: the final score is the result of the total QSO points multiplied by the sum of
Czech and Slovak counties and country multipliers. The total score is calculated by the

10. General Log Submission Requirements
10.1 Logs are accepted in CABRILLO electronic format only.
10.2 Logs are accepted via okomdx.crk.cz webpage only.
10.3 All times must be in UTC.
10.4 All sent and received exchanges must be logged.
10.5 In the header part of the electronic log submission you must specify entry category
and your full mailing address and email, suitable for receiving certificates and trophies.
10.6 Participants of Low Power and QRP categories must clearly identify equipment used,
as well as antenna types by band. Use the comments/soapbox of your Cabrillo log.
10.7 If you are unable for reasons unknown submit the log via the web page you might
send it via email – okomdx@crk.cz

11. Log Submission Terms
11.1 Logs must be submitted to the contest sponsors within 7 days after the end of
the contest .. (APR 16, 2023, 2359 UTC)

11.2 Receipt of the log is automatically confirmed by E-mail, as well as placement into
“Logs received list” page on OK-OM DX SSB Contest WEB page.

11.3. Since the CABRILLO format does not support SWL cathegory, it was decided that we will accept SWL LOGs in any reasonable format. Only SWL LOGs can be send via e-mail: okomdx.crk.cz, SWL LOGs are not accepted through the web.

12. Awards
12.1 Special Plaques will receive winner of each categories. One station can be awarded
maximum up to one plaque per year, for the category with the maximum points.
12.2 Each participant will be able to download a certificate from OK-OM DX SSB Contest
WEB page in pdf format. Paper awards are NOT send out.

13. Contest-Related Information
13.1 Every participant who sends his electronic log will see on the web page after the
evaluation his personal UBN-list with his claimed/confirmed results separately by
bands/modes and QSO list, containing his errors and errors of worked stations. Also
confirmed Czech county list for award “OK Counties Award” would be available.
13.2 Any OK-OM DX SSB Contest related questions should be sent to the
e-mail okomdx@crk.cz
13.3 OK-OM DX SSB Contest committee decisions are final.
Contest committee invites all the radio amateurs to take part in the first OK-OM DX SSB Contest.

Logging programs: http://okomdx.crk.cz/index.php?page=software


OK/OL Districts

APA – Praha 1
APB – Praha 2
APC – Praha 3
APD – Praha 4
APE – Praha 5
APF – Praha 6
APG – Praha 7
APH – Praha 8
API – Praha 9
APJ – Praha 10

Central Bohemia
BBN – Benesov
BBE – Beroun
BKD – Kladno
BKO – Kolin
BKH – Kutna Hora
BME – Melnik
BMB – Mlada Boleslav
BNY – Nymburk
BPZ – Praha zapad
BPV – Praha vychod
BPB – Pribram
BRA – Rakovnik

Southern Bohemia
CBU – Ceske Budejovice
CCK – Cesky Krumlov
CJH – Jindrichuv Hradec
CPE – Pelhrimov
CPI – Pisek
CPR – Prachatice
CST – Strakonice
CTA – Tabor

Western Bohemia
DDO – Domazlice
DCH – Cheb
DKV – Karlovy Vary
DKL – Klatovy
DPM – Plzen mesto
DPJ – Plzen jih
DPS – Plzen sever
DRO – Rokycany
DSO – Sokolov
DTA – Tachov

Northern Bohemia
ECL – Ceska Lipa
EDE – Decin
ECH – Chomutov
EJA – Jablonec n. Nisou
ELI – Liberec
ELT – Litomerice
ELO – Louny
EMO – Most
ETE – Teplice
EUL – Usti nad Labem

Eastern Bohemia
FHB – Havlickuv Brod
FHK – Hradec Kralove
FCR – Chrudim

FJI – Jicin
FNA – Nachod
FPA – Pardubice
FRK – Rychn n. Kneznou
FSE – Semily
FSV – Svitavy
FTR – Trutnov
FUO – Usti nad Orlici

Southern Moravia
GBL – Blansko
GBM – Brno mesto
GBV – Brno venkov
GBR – Breclav
GHO – Hodonin
GJI – Jihlava
GKR – Kromeriz
GPR – Prostejov
GTR – Trebic
GUH – Uherske Hradiste
GVY – Vyskov
GZL – Zlin
GZN – Znojmo
GZS – Zdar nad Sazavou

Northern Moravia
HBR – Bruntal
HFM – Frydek – Mistek
HJE – Jesenik
HKA – Karvina
HNJ – Novy Jicin
HOL – Olomouc
HOP – Opava
HOS – Ostrava
HPR – Prerov
HSU – Sumperk
HVS – Vsetin


OM Districts

Bratislava, prefix OM1
BAA – Bratislava 1
BAB – Bratislava 2
BAC – Bratislava 3
BAD – Bratislava 4
BAE – Bratislava 5
MAL – Malacky
PEZ – Pezinok
SEN – Senec

Trnava, prefix OM2
TRN – Trnava
DST – Dunajska Streda
GAL – Galanta
HLO – Hlohovec
PIE – Piestany
SEA – Senica
SKA – Skalica

Trencin, prefix OM4
TNC – Trencin
BAN – Banovce n. Bebr.
ILA – Ilava
MYJ – Myjava
NMV – Nove Mesto n. Vah
PAR – Partizanske
PBY – Povazska Bystrica
PRI – Prievidza
PUC – Puchov

Nitra, prefix OM5
NIT – Nitra
KOM – Komarno
LVC – Levice
NZA – Nove Zamky
v SAL – Sala
TOP – Topolcany
ZMO – Zlate Moravce

Zilina, prefix OM6
ZIL – Zilina
BYT – Bytca
CAD – Cadca
DKU – Dolny Kubin
KNM – Kysucke N. Mesto
LMI – Liptovsky Mikulas
MAR – Martin
NAM – Namestovo
RUZ – Ruzomberok
TTE – Turcianske Teplice
TVR – Tvrdosin

Banska Bystrica, prefix OM7
BBY – Banska Bystrica
BRE – Brezno
DET – Detva
KRU – Krupina
LUC – Lucenec
POL – Poltar
REV – Revuca
RSO – Rimavska Sobota
VKR – Velky Krtis
ZVO – Zvolen
ZAR – Zarnovica
ZIH – Ziar nad Hronom
BST – Banska Stiavnica

Kosice, prefix OM8
KEA – Kosice 1
KEB – Kosice 2
KEC – Kosice 3
KED – Kosice 4
KEO – Kosice-okolie
GEL – Gelnica
MIC – Michalovce
ROZ – Roznava
SOB – Sobrance
SNV – Spisska Nova Ves
TRE – Trebisov

Presov, prefix OM0
PRE – Presov
BAR – Bardejov
HUM – Humenne
KEZ – Kezmarok
LEV – Levoca
POP – Poprad
SAB – Sabinov
SNI – Snina
SLU – Stara Lubovna
STR – Stropkov
SVI – Svidnik
VRT – Vranov nad Toplou

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