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The Maryland - Delaware - DC (MDD) Traffic Net

MDD is the NTS Cycle 4 Section Traffic Net for the MDC and DEL Sections of ARRL.

MDD meets daily at 7:00 PM and 10:00 PM local time on 3.557 MHz.

MDD Protocol

Side channels, in order of preference - Up 2 (3.559) - Up 4 (3.561) - Up 6 (3.563, early MDD only)

Net Call-up - CQ MDD de [NCS callsign] MDD de [NCS callsign] MDD QND QNZ V V V

MDD QNA (rep list, one at a time, as in MDD QNA MEPN, etc.)

(If liaisons are called in sequence, each may be called simply by each net name after the first use of QNA, as in "MDD QNA MEPN," the station checks in with traffic list; the NCS then sends "BTN," and that station checks in with traffic list, etc.)

Rep List Early - 7:00 PM local (2300 UTC in EDT or 0000 UTC in EST)

from MEPN

from BTN

to MSN

to / from PKT

from DTN (Weekdays)/DEPN (Saturdays)

to / from MARS (during defense activities)

to 3RN


Rep List Late - 10:00 PM local (0200 UTC in EDT or 0300 UTC in EST)

from 3RN

to / from MSN

to DTN (Weekdays)/DEPN (Saturdays)

to / from PKT

to / from MARS (during defense activities)

to MEPN if traffic hanging out for MD


After reps have checked in, send MDD QNI - and take all comers, stations using the single letter two-step check-in method.

As soon as a station lists traffic, NCS looks for a receiving station and sends them off frequency to pass the traffic.

When all traffic has been dispatched, NCS excuses stations without traffic or relay job, individually, with - [Station's Call] 73 QNX. Then, if no other stations check in with traffic, the liaison stations may be excused. The point is that a station with traffic should try to be available when the net is opened to avoid surprises later in the net.

If time is short and a bunch of stations are waiting to be excused, it is good form to excuse them in a group.

If two stations are off frequency with a big load of traffic to pass while the rest of the net business is complete and all other stations are excused, NCS may QSY the net to the side frequency to meet the two remaining stations and catch them when they finish, excuse them and close the net right there. It is not good form to close the net before all stations have reported their traffic work completed when they have not been excused. It is permissible to dispatch stations off net, excused in advance, and followed by closing the net, but the NCS should go to the side frequency (the "stack") to listen to verify that the dispatched traffic was passed.

Normally, when NCS has wrung out the last bit of traffic, one last call for QNI, then close with:

MDD QNF de [NCS call] SK


Standard Format for Net Control Station Report to Net Manager

= ("BT" on air, "=" or "BT" in email)
MDD SUN SEP 29 0200Z
= ("BT" on air, "=" or "BT" in email)

Note - Use UTC times and UTC dates, so in summer the late (0200 UTC) session is next day, and in winter both sessions (0000 UTC and 0300 UTC) are one day ahead of local time. The day of the week (SUN) should be the local time day, so we have Sunday nets on September 28 (2300 UTC) and September 29 (0200 UTC). Not everyone does this, but it makes it easier for me to check and digest the data correctly.



NTS MDC Linked Cycle 2 Nets:

3RN 3.917 (3.913) 4:00 PM local

MEPN 3.820 6:00 PM local

NTS MDC Bridges Between Cycles 2 and 4:

BTN 146.67 6:30 PM local (145.33 backup); inbound from MEPN, outbound to MDD.

MEPN to MDD early net liaison.

NTS MDC Linked Cycle 4 Nets:

MDD 3.557 7:00 PM local

MSN 3.563 7:30 PM local

3RN 3.557 7:45 PM local

EAN 3.577 8:30 PM local

3RN 3.557 9:30 PM local

MDD 3.557 10:00 PM local

Third Region Cycle 4 Net Information for MDD Liaison Operators:

3RN Cycle 4 Protocol:

Net meets daily at 1945 and 2130 Local time on 3.557 MHz.

In summer, if 80 meters goes down, alternate is 7.070 MHz.

Reps to/from EPA, WPA, MDD and EAN

Usually over quickly

Side channels up 2 (3.559) and up 4 (3.561)

3RN traffic is divided so -

EPA gets PA Zip Codes 17xxx, 18xxx, 19xxx, 169xx

WPA gets PA Zip Codes 15xxx, 16xxx, 172xx

MDD gets all MD, DE, and DC.

All else goes EAN.

(All call signs used in examples are generated artificially and in no way related to the actual license holders, if any.)


Information provided by Robin (AA3SB) Schaefer

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