Moon-Net discussions

The following discussions took place in the Moon-Net reflector. I found the subjects so interesting that I decided to put together all related messages in a page, so that they can be used for future references.

Propagation:

• Polarization of signals and ground gain

• One way propagation 

• Libration fading and the scattering properties of the lunar surface  

• Long Delayed Echoes (LDE) on EME signals

• The ionosphere at VHF and its influence on the EME signals

Cables / Transmission lines

• How to attach hard-line coax to the tower and how to protect hard-line coax connectors 

• Open wire feeding and baluns 

• Velocity factor of an air-insulated line  

Power splitters / dividers / combiners / phasing

• Asymmetric power splitters/combiners  

• Maximum allowable error when cutting the phasing lines 

• How to calculate the phasing lines

Antennas / Stacking

• Best metal to use for boom to mast plates 

• Effects of boom sag in antenna gain 

• Use of offset dishes 

• Advantages/disadvantages of grounding antenna booms 

• Nesting of multiband stacked Yagis

• Aluminium oxidization and protection of Yagi elements

• H/V polarization for portable eme-station

• Deep of flat dishes?

Power amplifiers / Preamplifiers

• Preamplifier design software 

• Silver plating 

• Preamplifier and antenna relay configuration 

• Best HV connector 

• Combining (phasing) amplifiers

• Cooling PHEMT amplifiers

Rotators

• Variable speed control of a 3-phase azimuth motor

• Rotators for EME arrays

Operating

• Reducing precipitation static 

• Eliminating interferences from 88-108 FM stations  

• Lower limit for EME

• Setting the right QRG on EME

• Minimum EME antenna gain requirements

Measuring

• Measuring the NF (Noise Figure)

• How to find true North

• Solar noise measurement

Misc.

• Phase locking a microwave oven for EME use?

Other related links

EA6VQ's Ham radio pages

Moon bounce (EME) information and links

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