PI3EHV 2m repeater
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||145.100 MHz (71.9 Hz CTCSS)
||6 Watt (minus cable loss)
||Procom CXL 2-2C, 65 meter high
||Philips Natuurkundig Laboratorium, Waalre
The 2 m repeater PI3EHV services the Eindhoven area since around 1980.
The repeater is installed at Philips Research in Waalre.
The repeater is completely home-brew
and was originally constructed using modern concepts as
When the building was renovated
(stripped to it's concrete carcass en completely renovated),
the relay was
temporary installed at another location
and thoroughly reviewed.
The machine has been re-installed at it's old location and has
- The old controller proved to be unreliable and
has been replaced completely.
The repeater now behaves in a similar fashion like the other Eindhoven
- To access the repeater, CTCSS is required. The tone used
(71,9 Hz) is the tone used in all repeaters in the South of the Netherlands,
see VERON Vademecum for details.
The repeater ID's 'PI3EHV B' where the 'B' signals that 71.9 Hz is used.
- The repeater also transmits 71,9 Hz CTCSS, but only during activity,
not in beacon-mode. This helps to quieten handhelds in an every
increasingly noisy environment.
- The speech detector has been removed. To test access, whistling etc
is no longer neccessary, a short carrier is sufficient (and much nicer
to the other users of the repeater).
Users are kindly reminded about correct ID procedures.
- The audio-AGC no long blocks the audio path on insufficient deviation.
Insufficient deviation still makes the signal sound poorly, so please
provide enough modulation.
- The timeout timer has been eliminated, but give other users a chance
and keep transmissions brief.
- The ID'er now uses a low tone. Experiments have shown that this
low tone is attenuated on the small speakers of handhelds, so the beacon
is less obnoxious. When the repeater is active, the ID volume is reduced.
- The repeater still ignores 1750Hz bursts.
- Small changes were made to transmitter and receiver. We managed to squeeze
a few more dB's out.
CTCSS en old equipment
Old equipment doesn't have CTCSS. Fortunately, retrofitting isn't difficult,
using this kit.
There is work-in-progress on a smaller, more compact solution
(for e.g. blue "schiphol" radios). A prototype, using conventional
components, has been successfully built inside an IC-2E handheld.
We thankfully acknowledge Philips Research for the hospitality,
and hope our repeater can remain "guest" for many years to come.
Geert Jan PE1HZG
mail: pi3ehv (at) qsl.net
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