GB3PC and GB3PD Repeaters
These are the two repeaters maintained and managed by the Solent Repeater Group.
Location
GB3PC / GB3PD is situated in the lift room above the 20th floor of a building near Portsmouth Dockyard at Maidenhead locator IO90KT. This location was chosen as it provides one of the best possible radio locations in the City of Portsmouth. We have maintained a 145MHzv Repeater at this site since 1990. GB3PC Specification
waiting for an update from are engineer as the tail 300 should be in use
GB3PC uses a Skymast co-linear aerial (type HS.C6) fed by 10D-FB cable. The repeater control logic is a GB3US type II board, salvaged and completed by Andy Blagg (G4JXL). The radio used to do the work of the repeater is a Yaesu VXR 5000, with 12.5kHz channel spacing. The channel spacing is an important issue GB3PC conforms to the 12.5kHz bandwidth requirement. Stations using radios with deviation above +/- 2.5kHz will probably have trouble raising the repeater, if you have this problem, don't blame us!
GB3PC Frequency
The input frequency of the repeater is 145.175MHz, and the output frequency is 145.775MHz (channel RV62, or R7 in old money). The repeater delivers an effective radiated power of 25W, or 14dBw if you prefer. In order to raise GB3PC, you must transmit a 1750Hz toneburst lasting at least 300ms with audio. With NO dropping of carrier in between) The CTCSS is 71.9Hz.
GB3PC Identity signal
The repeater identifies itself with the phrase "GB3PC" sent in Morse code at 12wpm each time it is successfully accessed, and the phrase "GB3PC IO90KT PORTSMOUTH" is sent every
20 minutes. The extremely smart control panel for the repeater was hand-built by Andy Blagg (G4JXL) it is as professional as all his other work to date, and a real tribute to the philosophy that if a job's worth doing, it's worth doing well. |
|
GB3PD
GB3PD also uses a Skymast aerial. In this case it is a model LS.EF1. It's also fed along the excellent 10D-FB low-loss coaxial cable. The transmit-receive diplexer for this repeater is based on the WB5WPA design. It consists of six stubs manufactured using Andrews' Heliax by Andy G4JXL. The repeater develops 25W of effective radiated power from a Tait 300 series transceiver. The logic board used to control the repeater is an NHRC2 system, based on a PIC chip.
GB3PD Frequency
The input frequency of GB3PD is at 51.350MHz, and it outputs at 50.850MHz. Maximum permitted deviation is +/- 2.4kHz, and the CTCSS tone required is 71.9Hz (category B). GB3PD times out after 3 minutes in a single over, so no waffling! The repeater transmits the Morse code phrase "GB3PD B IO90KT" once every twenty minutes, and the phrase "GP3PD B" is sent upon successful access. All Morse code is sent at 12wpm.
GB3PD has recently returned to an "On air" status. Thank you to Brian G6FLX for his assistance with this project. |
