Wiring a uhf transceiver

Submitted: Thursday, Apr 20, 2006 at 17:04
ThreadID: 33096 Views:2924 Replies:4 FollowUps:3
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My son has a Hatadi Loepard MK2 radio which he cannot get working. We have put an antenna on the roof, does this need to be earthed ? Does the UHF itself need to be earthed as well. He has been told to run another power wire to one of the screws on the back of the radio itself. I find this hard to believe.
Can anyone help us.
Thanks
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Reply By: Member - Cruiser (NSW) - Thursday, Apr 20, 2006 at 17:23

Thursday, Apr 20, 2006 at 17:23
Are you sure it is a UHF ?

I seem to recall that the Leopard Mk2 is a 27 Mhz CB and was also called a Pearce Simpson Leopard Mk2.

As for the rest of your question, I am sorry, I cant answer that part.
AnswerID: 168113

Follow Up By: Member - Cruiser (NSW) - Thursday, Apr 20, 2006 at 17:26

Thursday, Apr 20, 2006 at 17:26
I stand corrected.

A google search confirms that the Leopard Mk2 is a UHF and was marketed as a Pearce Simpson, who no longer exist unfortunately.

Good luck with the wiring.
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FollowupID: 423353

Reply By: Russel & Mary - Thursday, Apr 20, 2006 at 17:40

Thursday, Apr 20, 2006 at 17:40
hullo wato, the UHF or aerial don't need to be earthed as such. Does the radio turn on ok, are the lights working? I guess you've got it hooked up to a 12volt supply somehow, just check that it's putting enough amps out. To simplify this, a normal power supply for radios will be ok but if you're using ,say, a model train set supply, then it will not have enough oomph to allow transmission or reception. If all this appears ok then it's possible that the radio is cactus. Latin Stufftous Maximous. Rus.
AnswerID: 168118

Reply By: Mad Dog (Australia) - Thursday, Apr 20, 2006 at 17:59

Thursday, Apr 20, 2006 at 17:59
There should be a negative and postive wire, attach to the power supply the correct way and it should light up, attach wrong way and it may blow the fuse or protection diode.
AnswerID: 168123

Follow Up By: wato35 - Thursday, Apr 20, 2006 at 18:07

Thursday, Apr 20, 2006 at 18:07
The lights are working OK, he can receive but not transmit.
Could this be how he wired the coax cable?
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FollowupID: 423374

Follow Up By: Russel & Mary - Thursday, Apr 20, 2006 at 18:29

Thursday, Apr 20, 2006 at 18:29
When he presses the microphone switch(PTT) (which means Push To Talk) is there anything on the front panel lighting up or a meter needle moving? (if the set has one). If not, then the mic switch contacts inside could have a bit of dust on them. You could undo the screws holding it together and give it a good blow with your mouth and give it a go again. It could aslo be possible for the mic lead to have a broken wire near the connection next to the set. You may need someone with experience with these plug to pull it apart and check. If you think the mic is ok but the set is still not transmitting, check your coax if you have an Ohm meter.There should be not electrical connection between the outer sheath and the centre wire. Hope this helps. Rus.
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FollowupID: 423380

Reply By: Member - uncle - Thursday, Apr 20, 2006 at 19:39

Thursday, Apr 20, 2006 at 19:39
From past experience it sounds like the final transmit diode has blown,this is caused when someone accidentally presses mic button and there is no antenna or 50ohm dummy load across the rear of the set.The transmit lights all illuminate/or signal meter moves to the right? But no one can hear you?Hope this sheds some light.
AnswerID: 168142

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