Ohmic Resistance, LLC
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We provide professional services designed to improve the skills of military communicators and radio direction finding specialists
1
Basic High Frequency Radio And Antenna Theory
We discuss high frequency radio wave propagation, antenna polarity, antennas, wave forms, and other basic concepts to help the communicator maintain and improve his or her communication skills.
Mission Essential Task List
MET: 113-625-4002: Manage Radio Systems Network (HF)
MET: 113-625-1005: Establish HF Radio Communications Link
MET: 331-18E-3046: Configure HF Radio with Embedded COMSEC
MET: 113-625-4014: Perform Frequency Management Planning
2
Frequency Propagation Class
We learn to use online tools to learn how to operate as a frequency manager. This includes the use of VOACAP, great circle azimuth computation, maiden head grid square determination, space weather effects on propagation, and ionosonde frequency mapping.
Mission Essential Task List
MET: 113-625-4012: Manage the Electromagnetic Spectrum
MET: 113-625-4014: Perform Frequency Management Planning
MET: 331-18E-3081: Plan to Employ Tactical Radio Systems
MET: 17-EW-4010: Conduct Electromagnetic Spectrum Management Ops
3
Radio Direction Finding Through Radio Networks
Understanding how high frequency propagation paths function is a critical component to the unit's radio direction finding efforts.
We offer classes in the history of RDF and how the detection and location of high frequency signals has not changed that much over time. We listen to signals and look at the waterfall to visualize patterns.
We dicuss propagation paths and their prediction as starting points for operators to begin their detection efforts.
After we complete the academic portion of instruction, we move to a field location to set up the unit's RDF equipment and transition into the detection phase.
As part of the course, we require the students to detect, locate and characterize high frequency signals. We accomplish this by locating upwards of a dozen communication nodes that operate from 30 to 1,000 miles from base in both long distance and NVIS configurations. The station comes on the air at a planned time to send SSB voice, 2G, 3G and other message formats.
Mission Essential Task List
MET: 34-CM-1103: Conduct Electronic Surveillance.
MET: 34-CM-2104: Perform SIGINT Geolocation.
MET: 17-EW-4001: Conducte Electromagnetic Spectrum Operations (EMSO).
MET: 34-INT-0001: Conducte Intelligence Operations in Support of MDO.
4
Field Expedient Antennas
The student receives classroom instruction about how to create field expedient antennas with materials sourced from local commercial supppliers.
We review several antenna types to include directional long wire, multiband, sloping, NVIS, vertical and horizontal antennas. The class includes the mathmatical formulas needed to calculate antenna lengths in various wavelength formats.
Next, we give materials to the students to allow them to make an antenna or two of their choice.
Finally, we take the students to the field. There, using their newly fabricated antennas, attached to PRC-160 or PRC-137 radios, we operate the radios in a network and attempt to contact radio stations in NVIS range and out to 1,000 miles.
Mission Essential Task List
MET: 331-18E-3044: Construct Sloping Vee Antenna
MET: 331-18E-3047: Construct (VHF/UHF) Expedient Ground Plane Antenna
MET: 113-596-1071 Construct a Near Vertical Incidence Skywave (NVIS) Antenna AS-2259/GRA.
MET: 331-18E-3056: Operate High Frequency Radio (PRC-160 or PRC-137).
MET: 113-571-1004.Operate in Radio Nets.
5
Manual Encryption Techniques
In an emergency, under a scenario where a unit no longer has access to its primary Type One or Type Three encrypted radio, but must send an encrypted message, or must hand deliver an encrypted message, this class covers authorized manual encryption techniques (as part of the E in PACE) that might be used when no other viable message encryption format is available.
The class reviews several versions of poly alphabetic, aperiodic, substitution cipher sytems. We learn to use a one time pad and how to create a one time crypto key. We utilize Vigenere’s Tableau, also called the tri-graph, to encrypt messages using trignomes. The students learn to create the tri-graph, and are required to successfully encrypt and decrypt messages.
Mission Essential Task List
MET: SAVSERSUP: 7. Prepare A
Tri-graph.
MET: SAVSERSUP 7: Identify Alternate Encryption Keys.
MET: SAVSERSUP 7: Manually Encrypt and Decrypt Messages.
6
Operating In Radio Networks
Coordinating with other operators, your unit's operator can operate in a widely dispersed HF radio network. This allows the operator to practice their HF radio and antenna crafting skills.
We can provide DX or NVIS practice sessions.
Mission Essential Task List
MET: 113-611-6005 Plan an HF Communications Network.
MET: 113-571-1004.Operate in Radio Nets.
MET: 113-596-1098 Construct Field Expedient Antennas.
MET: 113-630-2045 Perform Multiple Net Control Station (NCS) Community Operational Procedures.
MET: 331-18E-3046: Configure HF Radio with Embedded COMSEC.
7
Special Communications Projects
Please let me know if you wish to design a specific exercise or project. I can tailor a course to a unit's specific needs.
For example, I have created training scenarios involving units infiltrating into an urban or rural area that also incorporate using HF signals to "resistance forces" in advance of and during the unit's deployment.
Some of these training scenarios allow the unit's communicators to teach members of the resistance force how to operate certain types of radios or to engage in clansestine communication activities.
I can also provide fixed locations for units to conduct meetings and other operations.
FAQs
Common Questions
How do I register?
To register for our training programs, please visit our website's registration page or contact us directly for more assistance.
What skills do we cover?
Our courses cover basic radio theory, high frequency propagation tools, practical communication exercises, radio direction finding network exercises, manual encryption techniques for PACE plan, and antenna construction for high-frequency radio operations.