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I have a Sirio ml145 Mag mount and a midland alan 78 and cannot get swr down it now has distorted modulation any pointers

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Posted on Jan 02, 2017

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The best thing you can do is throw that mini mag mount junk antenna in the garbage and get a quality antenna like a K-40 or a Wilson Mag-mount

Posted on Sep 13, 2010


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1 Answer

Midlands alan 78!has distorted modulation

is this incoming or out going?
if its incoming check the speaker inside the radio.
if its out going again check the speaker in the mic.

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How to turn up the power on the midland 78 plus

Midland 78-574: {L209, L212, L214, RV9-AMC, RV201-ALC, RV#-SSB MIKE GAIN, VR4-AM PWR}
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I put these up due to not knowing which one you have

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Hi i have a midland 38 plus cb but the recieve is poor i have an excelent swr is there anything i can do to turn the receive up inside?

there is but if u get it wrong then you are stuft. i would just try the earth first cause altho the swr is good if the grounding is poor this will effect sigal.depending on mounting will depend on earth solution

May 01, 2011 | Midland 40-Channel CB Radio CB Radio

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Hi i have a midland alan 78 plus multi and it will not receive or transmit ,when you press the ppt button there's no signal strength showing on the display , the power supply is good and worked fine last...

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3 Answers

What antenna would you recommend for my cb? cobra 29ltd

depends on what vehicle its going on. If its a car, you don't need anything crazy, unless you are going to run a linear.

You are fine with a wilson 500/1000 mag mount or a k40 mag mount.

just make sure you tune the antenna for lowest SWR.

Sep 29, 2009 | Cobra 29 LTD CB Radio

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I set the swr on my antenna and it keeps moving i have a cobra 19 dx iv and i just installed a net window mount antenna 27" on my back window that has factory tint.

1) if you are talking, your SWR will most likely move. You must take the reading while not modulating, (talking into the mic)

2) Window mount antenna's are GARBAGE. they are worthless. BAD BAD BAD. You wasted your money. Get a mag mount.

3) if you are not in an open lot, your SWR's will be different due to structures reflecting signal back. Always take your SWR reading in an open lot.

4) You could be experiencing Common mode currents. Normally the signal travels on the inside of the coax ground. Common mode current is when the signal is traveling back down the coax on the outside of the ground in the coax. (The biggest cause of this would be the window mount antenna). If you want to keep that garbage antenna, then you can make an RF choke in the coax. The best solution is get a better antenna. Here is how to make the choke. As close to the antenna as you can, take 6 ft of coax and loop it uniformly laying each coil next to the other. use electrical tape to hold it in place. You want 6-8 wraps. You want a nice uniform coil.

Just get a better antenna. Window mounts are the worst. You get horrible receive and horrible transmit. Get a wilson 500 mag mount. It will work so much better for you.

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Midland alan 48 plus transmit scale not moving

Sorted now, soldered a new output transistor into the board and all working.

Dec 11, 2008 | Midland Radio Communications

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