The original measurements I made following the new feeder replacement
are recorded in message No. #129. Note that the HF antenna meaurements
will be affected by the height of the mast. It was lowered at the time
of the measurements.
Norman Stewart GM1CNH MM0BMG
Secretary, LaDARS
The N plugs and sockets from Diode Comms (SSB Electronics) suffer from
a design fault. The centre pin is not fully captive and can therefore
float backwards inside the connector. This is a result of movement in
the ECO-10 cable between the dielectric/foil and braid/sheath. This
can give rise to a failed or poor (lossy) interconnection as the pin is
shoved back by the force of connecting it to the mating connector.
I have decided to fit the PL-259 connectors instead. These have
compression gland and top hat fitting, the centre pin is rigid and
does not float. This will limit operation to VHF, ECO-10 is rated to 6
GHz. The alternative is to find a suitable 10 mm N connector that has
a centre pin which will accept a 3mm centre conductor.
Norrie
Thanks to all who were involved in the repairs to the antenna
system. A few minor tidy-up tasks are still to be completed plus
installation of the new additional feeder for a low band HF antenna.
VSWR checks were as follows:-
20m 1.3:1
15m 2.5:1
10m 1.6:1
2m 1.8:1
70cm 2.0:1
Please use low power only on the 2m and 70cm bands and Rx only (no
Tx) on the 15m band until the high vswr problems can be resolved.
Feeder, antenna and connectors to be checked on V/UHF; 15m antenna
elements/traps to be checked on HF antenna.
Norman Stewart GM1CNH MM0BMG
Secretary, LaDARS
Do you want to arrange a club evening event at LaDARS?
Select a free Tuesday evening and enter the details in the
Calendar/Events, set a reminder for 7 days before and 1 day before.
Also send notification to the RSGB news at least one week in advance
(see example below).
Norrie
GB2RS News - 3rd February 2008
News for Scotland
Livingston and District Amateur Radio Society will be having an
operating evening on Tuesday 5th February from 7 pm at the Crofthead
Centre, West Dedridge, Livingston. Further details from Norman
telephone 0131 449 7641 or uk.groups.yahoo.com/group/ms0liv.
73 de Norman Stewart GM1CNH MM0BMG
This is the proposed club events that were dicussed on 17 Jul 2007:
Test equipment evening
Operating evening, club station
Operating day, portable
Club antenna testing and maintenance
External visit
Morse practice
Use of test equipment
Offline 
Send Email
