Yoredales Region
Parts of  SD86, SD87, SD88, SD94, SD95, SD96, SD97, SD98, SE05, SE06, SE07, SE08


Aries ARC, along with the Phoenix ARC (MX0PHX) undertake many joint activities. Outline information is given on the Programme page. Additional details will normally be published close to the event or activity.
Vertical & Horizontal Polarization
Notes
Ideally, signals transmitted using a vertically polarised antenna (mostly FM transmissions) should also be received on a  vertically polarised one, otherwise there will be a 'loss' in signal strength (see below). Conversely, horizontal polarised transmissions (mostly SSB) are best received on a horizontal antenna.

If antennas of different polarisations to each other ('cross-polarisation') are used the signals will appear to be attenuated by as much as 20dB.  That is just over 3 S-points, and in some instances this may make the received signal too weak to resolve, or (especially on FM) to push the signal into the noise making it difficult to understand.

Clearly it would be best for YHARG to have both horizontally and vertically polarised antennas during each activity. However, while keen DXers and contesters may have horizontal antennas specifically for SSB, the majority of radio hams whom we contact do not.

In reality, the polarisation of radio waves can vary along their paths due to reflections and refraction (over hills or in the troposphere and due to 'aircraft scatter') and may be of mixed polarity at the receiver.  This applies equally to horizontally and vertically polarised antennas, so the situation is always less than 'perfect' and losses may be more or less than can be calculated theoretically.


For more information about propagation on VHF please see the PARC  Propagation Page .

 For more information on Phoenix Amateur Radio Club activities please follow these links:

www.phoenixarc.org.uk