Author Topic: increasing range of 418Mhz Mark III with antenna mods?  (Read 185 times)

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Offline DaleReid

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increasing range of 418Mhz Mark III with antenna mods?
« on: December 06, 2017, 09:16:58 AM »
I helped a friend set up a 'spare' Mk III, non-LR station at his place.  House has metal siding.  The location of the station sensors was in his garden, about 150' away, line of sight, nothing in the way between it and his receiver module which is in a window where the sensor station can be seen.

Most of the time all is well, but occasionally, even with a fully charged nearly new battery, the dreaded dashes of no reception appear.

I know that at higher frequencies yagis can be helpful, and some lines even have these.  With this design the antenna seems to be an end fed whip, no coax connection.

Has anyone found a trick to increase gain enough to be worth the trouble for the older Mark IIIs?  There is only one receiver and if there was some trick to make the antennas directional it would certainly help.


Thanks for any chatter or comments on helpful tweaks.  I mention antenna mods since that seems logical but there might be other things to try (short of a linear amplifier on the sensor suite's output.)  And I'm not ruling out trying other tricks for the receiver mod antenna,either.  It's just that the location in the garden is about the only one,  and now the ground is frozen, along with the spot in his kitchen where he and his wife agreed that the display can go ties my hands a little bit in moving around for a sweet spot.

Dale
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Offline dupreezd

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Re: increasing range of 418Mhz Mark III with antenna mods?
« Reply #1 on: December 06, 2017, 06:09:33 PM »
Dale, if the station comes equipped with a helical coil antenna, you might be able to replace it with an external mounted whip antenna such as this which have more gain (typical 2 - 3 dB).

The nice thing about this one is it comes with a piece of co-ax attached.
http://www.glolab.com/antenna/antenna.html

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Offline DaleReid

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Re: increasing range of 418Mhz Mark III with antenna mods?
« Reply #2 on: December 06, 2017, 07:26:11 PM »
This one has a long (1/4 wave) antenna hanging down out of the bottom of the weather resistant enclosure.  Darn.
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