1. 10 GHz … Northwest Style
Pacific Northwest VHF Society Conference, Seaside Oregon
Mike Reed KD7TS and Bob Larkin W7PUA
10 GHz...NW Style KD7TS & W7PUA Sept 2005

2. Ingrediants for Successful QSO’s
Portable Operation from High Spots
Home Stations Exploiting Propagation
10 GHz...NW Style KD7TS & W7PUA Sept 2005

3. Portable Operation W7LHL in Graham WA 10 ft TVRO Dish
Az and El Control
Microwave Gear at Antenna
4 Watts
DB6NT Preamp
10 GHz...NW Style KD7TS & W7PUA Sept 2005

4. 10 GHz Portable QSO’s Often Line-of -Sight Choose Locations for Access
Trees, Brush and Rock Path Obstructions
Challenging Roads!
10 GHz...NW Style KD7TS & W7PUA Sept 2005

5. 10 Milliwatt + Horn QSO’s Basic Low-Cost Setups
10 Milliwatt Crystal Control
Small 17 dB Horn Antennas
Example: 91 km (56 mile)path
20 dB S/N
Sufficient for CW & SSB
Distance 91 km (563 miles) and propagation is line-of-sight, with ground reflections Free Space path loss is dB This report says is that the path will have 153 db of loss, i.e., the received power will be 153 dbthan the transmitted power and lower in front of the distant end, and may go 16 db lower during fades The transmitter has 10 mW (+10 dbm), and we get to add the transmit antenna gain to this, for an equivalent transmit signal for no antenna gain of of +27dbm. Without any antenna gain, this arrives at -126 dbm. We add the receive antenna gain of 17 db and we have an -109 dbm level coming from the antenna Assuming a receive system NF of 2 db and a bandwidth of 500 Hz, we have a noise level of about -149 dBm with an average S/N ofof (-149) or 40 dB!
Fading may reduce this level or enhance it some.
10 GHz...NW Style KD7TS & W7PUA Sept 2005

6. 10 Milliwatt + Horn QSO’s Basic Low-Cost Setups
10 Milliwatt Crystal Control
Small 17 dB Horn Antennas
Example: 91 km (56 mile)path
20 dB S/NSufficient for CW & SSB
Distance 91 km (563 miles) and propagation is line-of-sight, with ground reflections Free Space path loss is dB This report says is that the path will have 153 db of loss, i.e., the received power will be 153 dbthan the transmitted power and lower in front of the distant end, and may go 16 db lower during fades The transmitter has 10 mW (+10 dbm), and we get to add the transmit antenna gain to this, for an equivalent transmit signal for no antenna gain of of +27dbm. Without any antenna gain, this arrives at -126 dbm. We add the receive antenna gain of 17 db and we have an -109 dbm level coming from the antenna Assuming a receive system NF of 2 db and a bandwidth of 500 Hz, we have a noise level of about -149 dBm with an average S/N ofof (-149) or 40 dB!
Fading may reduce this level or enhance it some.
10 GHz...NW Style KD7TS & W7PUA Sept 2005

7. The 17 dB Horn Simple Easy to Build
Polarization as shown is Horizontal
10 GHz...NW Style KD7TS & W7PUA Sept 2005

8. Horn Pattern
-3 dB at 10 degrees
-8 dB when 9 degrees off

9. Portable Station Upgrades
1 Watt Transmit Amplifiers
2 foot Parabolic Dish Antennas
!-Watt amplifiers are available at reasonable cost from the San Diego Microwave group. These are surplus from Qualcomm equipment and must be converted down in frequency from 14 GHz. Full instructions are available for this, but it requires working with very small parts.
Commercial amplifiers are available ready-to-go at powers up to 10 Watts or so.
The 2-foot dish size is easily handled in a portable environment. Surplus offset dishes are inexpensive, but again reqire modification for the frequency of use. Spun aluminum dishes are available requiring the construction of a centered feed.
For a dish up to 2-feet, the support can be a camera tripod.
10 GHz...NW Style KD7TS & W7PUA Sept 2005

10. Portable Upgrade Performance
Transmit Power +20 dB
Transmit Antenna +16 dB
Receive Antenna +16 dB
Signal +52 dB over 17 dB Horns and 10 mW

11. Portable Upgrade Performance
Transmit Power +20 dB
Transmit Antenna +16 dB
Receive Antenna +16 dB
Signal +52 dB over 17 dB Horns and 10 mW

12. Be On Frequency! 100 Hz at 2-meters is 7.2 kHz at 10 GHz
Stability is Important
Use Harmonics of Reference
24 x is

13. Antenna Pointing can be Crucial!
A 2 ft Dish has a 2 degree Half- Beamwidth
Losing half power is not good!
A high Quality Compass is Invaluable

14. Hand Bearing Compass

15. View through Compass Readable to 1/2 degree Scale Overlays Sight
Requires Headings
Maps
Calculations - BD.EXE

16. Magnetic Declination True-Magnetic Difference
From /geomag/jsp/Declination.jsp
Slow change with time

17. 10 GHz Home Station Operation
Greatly increases potential use
Bigger antennas are possible
Rare and non-summer propagation
Slower data rates are practical
It really works!!

18. W7LHL at Home W7LHL in Graham WA 10 ft TVRO Dish Az and El Control
Microwave Gear at Antenna
4 Watts
DB6NT Preamp

19. KD7TS at Home KD7TS in Des Moines WA 2 foot Offset Dish
Az and El Control
Microwave Gear at Antenna
1 Watts
DB6NT Preamp

20. W7SZ

21. 10 GHz - Beyond Line of Sight
Tropospheric Scatter
Rain Scatter
Upper-Troposphere, aka “Green GOES”
Airplane Scattering
Tropospheric Ducting - PNW???

22. 10 GHz Tropospheric Scatter
Scattering by Tropospheric “Blobs”
Similar to Lower Frequencies
Useful to Hundreds of Miles
Requires Low Takeoff Angles

23. 10 GHz Rain Scatter

24. 10 GHz Rain Scatter Scattering by Precipitation
Doppler Shift & Spreading
Relatively Strong Signals
Andy Flowers, K0SM Program:

25. K0SM Rain Scatter Program

26. 10 GHz Upper-Tropo Scatter
Scattering by Water Vapor or Ice Crystals
Very Weak Signals
Useful to Hundreds of Miles
Capable of Working Over Hills
Narrow Signals
Info:

27. KD7TS to W7PUA Typical Obstructed Home-Station Path
Common viewable volume high in troposphere
Well equipped stations
1 Hz frequency Control & DSP-10 at both ends
Path Worked Digital, CW and SSB
Distance 91 km (563 miles) and propagation is line-of-sight, with ground reflections Free Space path loss is dB This report says is that the path will have 153 db of loss, i.e., the received power will be 153 dbthan the transmitted power and lower in front of the distant end, and may go 16 db lower during fades The transmitter has 10 mW (+10 dbm), and we get to add the transmit antenna gain to this, for an equivalent transmit signal for no antenna gain of of +27dbm. Without any antenna gain, this arrives at -126 dbm. We add the receive antenna gain of 17 db and we have an -109 dbm level coming from the antenna Assuming a receive system NF of 2 db and a bandwidth of 500 Hz, we have a noise level of about -149 dBm with an average S/N ofof (-149) or 40 dB!
Fading may reduce this level or enhance it some.
10 GHz...NW Style KD7TS & W7PUA Sept 2005

28. GOES WV4 Maps
Distance 91 km (563 miles) and propagation is line-of-sight, with ground reflections Free Space path loss is dB This report says is that the path will have 153 db of loss, i.e., the received power will be 153 dbthan the transmitted power and lower in front of the distant end, and may go 16 db lower during fades The transmitter has 10 mW (+10 dbm), and we get to add the transmit antenna gain to this, for an equivalent transmit signal for no antenna gain of of +27dbm. Without any antenna gain, this arrives at -126 dbm. We add the receive antenna gain of 17 db and we have an -109 dbm level coming from the antenna Assuming a receive system NF of 2 db and a bandwidth of 500 Hz, we have a noise level of about -149 dBm with an average S/N ofof (-149) or 40 dB!
Fading may reduce this level or enhance it some.
10 GHz...NW Style KD7TS & W7PUA Sept 2005

29. 10 GHz Reference URL’s
KD7TS VHF/UHF/Microwave:
DSP-10 I-F Radio:
W7CQ Eugene 10 GHz Beacon:
GOES Water Vapor Map: