[cma-l] Fwd: Re: Warm weather hazard

[Alex Gray, Two Lochs Radio]

We use to have that  sort of trouble with an RVR 1.5GHz link receiver – two
of the chips inside were old-style DIP plug-in packages, and over the
seasons they would steadily ‘walk out’ of their sockets – presumably because
of temperature cycling, perhaps aided by vibration from the ridiculously
noisy fans in those units. I solved it by putting some tiny bits of neoprene
sponge on the inside of the case where they exerted very gentle pressure on
the backs of the ICs when the case was closed up.

 

We also had a BW TX 600 going off intermittently a couple of summers ago,
and before heading for the hills to sort it, noted that it was going off for
a very regular short period before returning to service for a while and then
repeating this, but the breaks were longer during the day, shorter in the
morning and evening, with no problem at all at night. By now you may have
guessed – the cooling fan had failed, and as the transmitter heated up its
thermal protection was cutting in while it cooled down again. During the day
it was heating up quicker and cooling down more slowly. I wish all
intermittent faults were so straightforward to diagnose!

 

Alex

 

From: cma-l-bounces at mailman.commedia.org.uk
[mailto:cma-l-bounces at mailman.commedia.org.uk] On Behalf Of Mike Davison
Sent: 21 June 2017 11:58
To: The Community Media Association Discussion List
<cma-l at mailman.commedia.org.uk>
Subject: [cma-l] Fwd: Re: Warm weather hazard

 

I second Ian's warning as we had a problem the other day. During the early
hours of monday morning there was a sudden drop in modulation level and a
definite reduction in audio quality of the output of the station. Checking
the 1.5GHz link output cleared the studio of any problem so a trip to the
transmitter site was necessary fearing the worst of a major item failure.
Whilst monitoring the relative components of the VHF output and swinging out
the wall mounted cabinet everything returned to normal so we concluded it
was a connection problem and checking around it was found the baseband feed
from the link receiver to transmitter had an un-locked BNC plug which was
duly secured. We can only guess that expansion/contraction of the loose plug
had eventually produced the intermittency but it was a sobering experience.

Mike Davison

 

On 21/06/2017 07:57, Ian Hickling wrote:

 

Remember @DelBoy_ofah?

Trigger:There's an old saying,look after your broom.

Rodney:And your broom will look after you?

Trigger:No Dave, just look after your broom.

Remember your transmitter.

We've had to deal with four in the last two weeks that had overheated.

Pay it a visit - take a vacuum cleaner with you - and suck out the dust and
fluff from the vents at the front and the fans at the back.

Check that they're working and check the PA temperature.

A bit cheaper than going off air - and having to find £2500 for a new one?

 

 

Ian Hickling

Partner

 <http://www.transplanuk.com/> 

Office: 016 3557 8435  (07h to 22h GTS)

Car: 075 3098 0115 (only responds when driving)

6 Horn Street, Compton, NEWBURY, RG20 6QS






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