Midland 77-099 Problem

4x4 CB radio advice and troubleshooting

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side-show-bob
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Fri Apr 22, 2011 6:45 am

Hi all me and a mate bought a pair of Midland 77-099 from a well know auction site, it said that they were both in working order if not a little bit worn..

So we set about and fitted them into our Discos to be used whilst out and about green laneing etc.

My set-up is as follows:

Unit up in the roof in the map pocket powered from the interior light supply, then its a short run of RG58 cable with a clamp fit PL259 on either end, to a:

Base-loaded CB Mini Tornado Stinger Antenna
Frequency: 27-28 MHz
Power: 1000W
SWR: 1.5:1
Fitting: standard 3/8
Length: 88cm

When i do a SWR reading i hook up the meter as described in the instructions and carry out the test, turning the "CAL" knob doesn't do anything and when i take readings on different channels the needle move ever so slightly above 1. The SWR meter is:

(other company) SWR-100 CB meter
Frequency: 26-30MHz; impedance: 50 OHMS; connection: 2 X SO239 sockets

when i turn the Midland on when it is all connected to the antenna and not the SWR i get power and a very faint static noise if i turn the squelch to about half way, but you need to put your ear near the speaker to hear it.

I am now at a loss as to what to do next, i have been told to get the unit tested but i cant find anyone near me to take it to (Kent), can i start testing the unit myself i have a multimeter and access to some other equipment if needed, i just need a place to start really..

Thanks

Rob

joe jeep
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Location: Littlehampton, West Sussex

Fri Apr 22, 2011 8:58 am

what aeial mount are you using could be an earth problem?
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side-show-bob
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Fri Apr 22, 2011 10:09 am

Ok so i may have made a mistake,

It is a custom made bracket attached to one of the roof rails on a Discovery, but there is a rubber strip between the bracket and the roof bar. Dose the antenna need to be earthed as well as the radio?

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stampman
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Sat Apr 23, 2011 11:32 am

check the mic out first sounds like thats the problem on rx


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MikeZero
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Sat Apr 23, 2011 12:04 pm

side-show-bob wrote: powered from the interior light supply,
Hi Rob, R U sure that the interior light fitting is capable of providing enough power for a CB? Even a little Midland like that will want two or three amps. Try the radio using a cigar lighter plug to see if it does the same thing

side-show-bob
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Sat Apr 23, 2011 12:10 pm

Ok so an update, i have just checked the mic and found that the earth had come off so now i have sound when the unit is on, i get white noise when the squelch is around min and then nothing when moved to max is that correct?

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stampman
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Mon Apr 25, 2011 11:01 am

yes thats working ok sorted


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stampman
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Fri Jan 15, 2016 9:40 am

yes the antenna MUST be earthed or it will not swr



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Dragonfly
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Fri Jan 15, 2016 3:23 pm

If the needle is hardley moving on the SWR meter check the power switch on the back of the CB , It needs to be on high output power to move the needle properly.
Roof rack should be earthed to the Disco body for best groundplane .

I have found that the 77.099 midland will misbehave if it has no 2 amp fuse fitted but if it is recieving ok then it should transmit ok .

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stampman
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Sun Jan 17, 2016 9:10 am

are we that bored we are answering posts from 2011 there is no hope for us

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