This page gives a breakdown of the MOULD Radio Scheme by Home Defence Region. The individual networks within each Region and the site or sites used to rebroadcast them are listed. This is historical data as the system has been switched off and dismantled.
Overview
Key to Map
A full description of the MOULD radio scheme is given on the main article, linked via the tabs above or from the bottom of this page. A 'Net' or network consists of one or more hilltop sites all broadcasting the same messages. The right hand table show the 'Nets' within the Region and the site(s) they broadcast from. The map shows the radio links between hilltop sites used to create these networks.
Links between hilltop sites were either single channel at VHF or UHF frequencies or two channels per link frequency using a 1 + 1 carrier system. VHF links being used across longer hops or difficult terrain where UHF couldn't provide a reliable path. These are shown on the map according to the Key here. In some places two separate radio links connected hilltops together.
For those interested to know the frequencies that were in use by MOULD rebroadcasters, perhaps to compare notes with you own list of scanning frequencies, please have a look at the last topic on this page.
Hilltop Radio Frequencies
Frequencies - PDF
This 33 Kilobyte PDF document requires the case sensitive password RingBell on opening.
Each hilltop site had between one and five rebroadcasters working in VHF low band. The transmitter radiated on 74 to 76 MHz and received on 79 or 84 MHz. Most of the frequencies were used more than once across the whole country. The separation between sites using the same frequency being sufficient to avoid interference. This document lists the Hilltop Transmit Frequency, Receiver Frequency, Channel number in the Pye 914 Radio, Site Name and Net Name.
To prevent undesirable indexing of this PDF document by Web Crawlers, it has been encoded and requires the stated password to be used Note: it is case sensitive. I am sorry if this is a nuisance but html allows whole pages to be excluded from search engine indexes but not documents linked from a page.
