YO3FVR's WEBsite

Ham Radio Activities, Topics and Tools

My callsign on APRS Map

VHF Propagation Map 

Emergency messages via APRS network

Commands for APRS services

Make QSOs via CQ APRS group (CQSRVR)

Using this feature, you can make contacts with other APRS users, which are part of CQ group. This feature uses a special APRS server, named CQSRVR (this service was developed by AE5PL). In order to use this service, you should do the followings:

  • prepare a new message to CQSRVR;
  • in the body message type a string with the following format:  CQ [group_name] [main_message];
  • in this string, [group_name] is CQ and all registered users to this group will receive your message, specified in the [main_message] field. After this message, maybe somebody will respond.

Other groups could be: AMSAT, JOTA, ECHOLINK (Send CQ and the give local node), ISS etc.

When you send a CQ message to a group, you will be automatically registered in that group. In order to indicate your continous presence on specific group, you must send a CQ message to this group at every 30 minutes. If you are innactive for more than 12 hours, you will be unregistered automatically. Same rule is applied also for the group.

To unregister from a group, send an APRS message to CQSRVR with the following format: U [group_name].

The CQSRVR service provides also another useful commands:

  • ? - list of all active groups
  • ? [group_name] - how many users are in the group
  • L - list all groups where you are member

Another special APRS server is ANSRVR. It is similar with CQSRVR but allows to join quietly to a group and also to send announcements to other users.

An announcement can be send via an APRS message to ANSRVR, with the following body text: CQ <Group> "Announcement Text".

Other commands supported by the ANSRVR server are the following:

  • ? - Show all groups (# in parenthesis is number of members)
  • ? group - Show member count in group
  • D show groups with descriptions, also sending D <group> description text, will supply a description of the group to the server
  • L - List groups you are a member of (with member count including self)
  • J group - Join group quietly
  • K group1 group2 group3 … - Quietly Keepalive multiple groups (be careful of APRS message length limits)
  • CQ group text - Join group and send text to all current members, if the group does not exist it will be created and you will be the owner
  • U group - Leave (Unjoin) the group

Satellites prediction using APRS

Any APRS platform capable to handle message, can be used to predict the next passes of some amateur satellites. For this purpose, you have to send an APRS message to a satellite name available between brackets at the following link:


This file contains the TLE coordinates used by a lot of prediction applications for ama.

If you decide who is the recipient (which means what satellite pass you want to predict), then, in the message body you have to enter your call-SSID. Prior to this, we assume that recently, your position for this call-SSID was sent via APRS.

 As a result, you will receive a message about the next or current satellite pass, as follows:

  •  If there is more then one hour to the next pass, you will be informed about the AoS (Acquisition of Signal) start time and direction plus maximum elevation of this pass;
  • If there is less than one hour to the next pass, the information will contain the start AoS and direction, followed by maximum direction and elevation and finally the LOS (Loss of Signal) direction and total time between AoS and LoS;
  • If the satellite is already in your sight, in ascension phase, you will get the current direction and elevation of the satellite, followed by the direction and maximum of the predicted elevation and at the end, the direction and time remaining till LoS.
  • If the satellite is in your sight, but in descending phase, you will receive the current direction and elevation of the satellite, followed by the direction and time remaining till LoS.

You can test this APRS feature starting with the International Space Station, during evening and nights with clear sky, because you can really see the object. First, beacon your position, then send an APRS message to ISS with text body yourcall-SSID. Be sure that yourcall-SSID is the same used when you prior beacon the position.

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My QSL policy

  • Any QSO recorded in my logbook (YO3FVR @HRDLOG.NET) is 100% confirmed very soon on eQSL.cc and with a QSL card via buro or direct for countries with no buro.
  • The QSL buro from YO3 send QSL cards at 6 and/or 12 months intervals. If you don't receive a QSL card from my side after 12 or 18 months from the QSO date, please send me an E-mail and I will correct this with a direct QSL.

About me

  • Radio equipments:
    • FT-817 ND
    • LDG Z-817 ATU
    • Hendricks PFR-3 QRP, abt. 5 wtts pwr, CW only, used mainly in 40 and 20m
    • Softrock SDR RX/TX Ensemble, for 40/30/20 m bands (still in tests)
    • MAAS DX-5000, 10/11 m bands only, up to 15 wtts for CW/AM/FM and up to 30 wtts for SSB
    • MAAS AHT-2UV, VHF/UHF Transceiver, 5W / 4W power
    • Wouxun KG-UV8D and KG-UV9D VHF/UHF Transceivers, 5W / 4W power
    • Baofeng UV9R+HP VHF/UHF Transceiver, 8W/ 7 W power
    • Baofeng UVB2+ VHF/UHF Transceiver, 5W / 4W power
    • Baofeng GT-3DMR Mark IV Analog & Digital, VHF/UHF Transceiver, 5W power
    • AP510 / AVRT5 APRS Tracker Transceiver, 1W power
  • Antennas:
    • random or long wire, various lenghts, depending on field conditions
    • MAAS HVT-400B portable multiband antenna, HF 80/40/20/15/10 m, 6 m, VHF 2 m and UHF 70 cm
    • PROXEL PRO-X1 portable multiband antenna, HF 80/40/20/15/10 m, 6 m, VHF 2 m and UHF 70 cm
    • Whip antenna for 10/11 m bands
    • PROXEL EX-108-UV/SMA, for 2m and 70cm mobile operations
    • PROXEL EX-211 UV/SMA, for 2m and 70cm mobile operations
    • Nagoya NA-771, for 2m and 70cm mobile operations
    • Nagoya NA-805, very small antenna for 2m and 70cm mobile operations
    • Pryme AL-800, for 2m and 70cm mobile operations
    • Home made dipole, with telescopic arms, tunable for VHF/UHF operation
  • Prefered operating modes:
    • CW, PSK31/63, JT65HF/FT8 and SSB in 40, 20, 15 and 10m bands
    • APRS in 2m band
  • Member of:
    • YO-QRP Club: #036
    • Essex CW ARC: #088
    • 9A QRP Club: #097
    • ARPOC (Amateur Radio Portable Ops Club): #129
    • LIDS CW: #140
    • WSC (World SSTV Club): #311
    • HPC (Hellenic PSK Club): #733
    • CTC (Croatian Telegraphy Club): #2983
    • NAQCC (North American QRP CW Club): #3901
    • SKCC (Straight Key Century Club): #5909
    • EPC (European PSK Club): #24308
    • QRP Club Forum (qrpclub.org): no number

The RoLink Network

RoLink is a national coverage network in YO, which uses mainly UHF nodes, but also VHF nodes, spreaded in the main Romanian cities and interconnected via Internet network. Using this network, radio hams can have remote contacts at national level, using only VHF/UHF handheld transceivers. Because the voice is carried between nodes over Internet network, RoLink is accessible also via Echolink (YO3KXL-L / 476786)

The following frequencies must be saved on the transceiver and used depending on region:

  1. Duplex RX = 439.100 MHz, TX = 431.500 MHz (shift -7.6 MHz), CTCSS TX = 103.5 Hz
  2. Simplex RX/TX = 439.100 MHz, no shift, CTCSS TX = 103.5 Hz
  3. Duplex RX = 439.075 MHz, TX = 431.475 MHz (shift -7.6 MHz), CTCSS TX = 103.5 Hz
  4. Simplex RX/TX = 439.075 MHz, no shift, CTCSS TX = 103.5 Hz
  5. Simplex RX/TX = 145.2875 MHz, no shift, CTCSS TX = 103.5 Hz
  6. Simplex RX/TX = 145.3375 MHz, no shift, CTCSS TX = 103.5 Hz

More details can be found on the following links:

Radio Restrictions in YO

!!! In Citizens' Band (26,960 – 27,410 MHz), the channels having the following central frequencies, are excluded from the use of the general public: 26,995 MHz, 27,045 MHz, 27,095 MHz, 27,145 MHz şi 27,195 MHz. These frequencies are reserved for radio devices used for remote movement control

World Wide frequencies for Emergency

Global Voice Channels:

  • 3.791     MHz USB
  • 7.1855   MHz USB
  • 10.1455 MHz USB
  • 14.346   MHz USB
  • 18.117   MHz USB
  • 21.4325 MHz USB
  • 24.932   MHz USB
  • 28.3125 MHz USB

Citizen Band:

  • Channel 9, 27.065 MHz AM
  • Channel 19, 27.185 MHz AM

IARU Region 1:

  • 3.760 MHz
  • 7.110 MHz
  • 14.300 MHz
  • 18.160 MHz
  • 21.360 MHz

IARU Region 2:

  • 3.750 MHz, 3.985 MHz
  • 7.060 MHz, 7.240 MHz, 7.275 MHz
  • 14.300 MHz
  • 18.160 MHz
  • 21.360 MHz

IARU Region 3:

  • 3.600 MHz
  • 7.110 MHz
  • 14.300 MHz
  • 18.160 MHz
  • 21.360 MHz

Atlantic area - Especally in the hurricane seasons, pay attention and listen carrefully the below frequencies, before start to transmit:

  • USA:
    • Maritime Mobile Service Net: 14.300 MHz
    • Hurricane Watch Net: 14.325 MHz
    • Salvation Army Team Emergency Radio Network (SATERN): 14.265 MHz
  • Caribbean Emergency & Weather Nets: 7.162 & 3.815 MHz
  • Eastern Caribbean Panama: 7.085 MHz Narrow Band Emergency System Net: 7.036 MHz USB (Olivia & MT63)
  • Caribbean Emergency: 14.185 MHz
  • Republica Dominicana: 7.065 & 3.780 MHz
  • Cuba: 7.045, 7.080, 7.110, and 3.740 MHz
  • Central America: 7.090 & 3.750 MHz 
  • Nicaragua: 7.098 MHz
  • Guatemala: 7.075 MHz
  • Mexico: 7.060 & 3.690 MHz

Credits, copyrights and trademarks

Resources used in this website:

Images used in this website:

Copyrights & Trademarks:

  • APRS®, Bob Bruninga, WB4APR

And, all hardware and software names used are brand names and/or trademarks of their respective holders

Could be a nice motto for radio hams ...

"The amateur works from moral pleasure and what he produces it always like; the artist works from intellectual needs and very rarely he likes what he does ... "

"Amatorul lucreaza din placere morala si ce produce ii face intotdeauna placere; artistul lucreaza din nevoie intelectuala si foarte rar ii place ce face ..."

Ion Luca Caragiale, 1852 - 1912: Romanian writer, very appreciated for how he succeed in illustrating the Romanian society of his time, which, in many ways, is unchanged, even after 100 years.