Brushbeater Commo

Brushbeater Commo 1

This is the first in a series of Brushbeater commo posts that I’ve reposted to give you some ideas on commo gear and use.

__________________________________________________________________

Keypounder sends-

“You are the lead station operator in the Resistance receiving station
mentioned in the first question.  You have received the message sent by
the operator in the capital at 1 pm local time in the first example on
160 meters and must now forward the vital information received to
Resistance HQ via HF radio.  Once you transmit this message, you will
immediately relocate to another predetermined location you have selected.

Assume the following:

-your station is located at approximately 65 degrees West and 10 degrees
North;
-Resistance HQ is located somewhere in the Intermountain Western united
States, New Mexico to Montana, Eastern Oregon to the Western Dakotas;
-Resistance HQ has receive capability 24/7/365 and will be waiting to
copy your message during whatever window you have told them to listen on
whatever frequency segment(s) you have specified;
-The message from the capital of Venezuela consists of 25 each 5 letter
encrypted groups.  You will re-encrypt the message prior to
retransmission using a OTP, but there will still be a minimum of 125
random letters to transmit;
-You are required to use any of the ITU region 1 authorized amateur
radio frequencies and modes from 1.8 to 29.7 mHz;
-You will have been onsite for at least a week prior to receiving the
message from the capital of Venezuela, and will have access to a small
house nearby the station site, but are forbidden to set up equipment at
the house;
-You are required to complete the transmission to HQ in less than 20
seconds, and to evacuate the transmit site in less than 15 minutes after
completing the transmission leaving no material behind.  You have 4
dedicated helpers with no electronics or radio training available;
-You have a compact 4wd crew cab pickup truck for transport, and
everything, your crew included, must fit into the truck.  No radio
equipment may be visible from outside the vehicle;
-Assume the ground is level farmland with very rich loamy soil planted
in low-growing crops or grass, with tall trees (>50′ high) at the field
boundaries with steel t-post electric fences around each field, and that
the field lines run north-south/east-west.  Further assume that each
field section is 8 hectares in area square. The surrounding general area
is agricultural, both crops and stock.”

Questions-

What frequency segment and time will you select to minimize DF
likelihood and maximize the chance that HQ will acknowledge it?  What
will your alternate(s) frequencies be, and under what circumstance will
you use them?

What antenna(s) systems will you use for transmitting this message?
How high will they be placed?  How will you orient and erect them and
take them down to minimize possibility of observation? Explain in
detail, including specifics of antenna and transmission line.

What mode will you use for transmitting the message?  If digital,
which specific mode and why?

Before you leave for Venezuela, you will be given an opportunity  to
study data available through NOAA on radio propagation.  Which ionosonde
stations will you study, and why?

What will your cover story be if you are stopped by Venezuelan security
forces?

Thoughts?

____________________________________________________________________________________________

JCD

 

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