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Repeter with 2 HT750
- Thread starter bren66
- Start date
- Status
it shouldnt be that hard. I dont have the schematics available or I would give you the actual points. but here is waht you need to do. You will need the service manual to locate the actual hook up points.
For the recieve you can take audio from the input to the audio amp (this will have the pl tone filered out and will give a constant level audio signal for the transmitter). The rx audio line can go to the mic input of the transmitting unit. I believe that the volume control is just a level control for the audio amp so there is no audio on the pot.
For the PTT you can use the signal detect led and route it to the ptt on the transmitter radio.
Thats the basics , you will probably need to add in a level control for the audio and a buffer transistor for the PTT.
For the recieve you can take audio from the input to the audio amp (this will have the pl tone filered out and will give a constant level audio signal for the transmitter). The rx audio line can go to the mic input of the transmitting unit. I believe that the volume control is just a level control for the audio amp so there is no audio on the pot.
For the PTT you can use the signal detect led and route it to the ptt on the transmitter radio.
Thats the basics , you will probably need to add in a level control for the audio and a buffer transistor for the PTT.
K4APR
Member
It has been a while since I programmed any Moto Professional radios, but I THINK there might be a pin on the spk/mic jack that can be asserted high or low on carrier detect.
Once you get away from a shop for a while, you start to forget (I can thank NASA for that)
Once you get away from a shop for a while, you start to forget (I can thank NASA for that)
You still haven't mentioned what you'll do for a duplexer or what you'll do about cooling the transmitter PA.
Unless the receive and transmit antenna separation and the input and output frequency separation are considerable, the dream of a working repeater is going to require a duplexer. The transmitter is going to seriously desense the receiver without one, and the receiver in the particular radio model you're talking about using was never designed with repeater use in mind.
The transmitter PA is designed only for portable radio use, not extended or rapidly repeated transmitting, therefore, it has a completely inadequate heatsink for any semblance of repeated or extended transmitting. The designed duty cycle of these things is 5-5-90. That means receive 5% of the time, transmit 5% of the time, and remain silent 90% of the time, and all that revolves around battery life expectations and component life. If you have an external power supply for the radios, battery life and receive time becomes moot, but the transmit time does not.
Reprogramming for a lower power output may help a some for desense, cooling, and power consumption, but it won't really make much difference in the actual usage. Either way, you'll have to come up with a way to keep the transmitter PA cool or suffer the consequences of using it beyond the design limitations.
I don't know how they put the smoke and smell into the components, but when you do something that lets the smoke and smell out, they never work right again.
Unless the receive and transmit antenna separation and the input and output frequency separation are considerable, the dream of a working repeater is going to require a duplexer. The transmitter is going to seriously desense the receiver without one, and the receiver in the particular radio model you're talking about using was never designed with repeater use in mind.
The transmitter PA is designed only for portable radio use, not extended or rapidly repeated transmitting, therefore, it has a completely inadequate heatsink for any semblance of repeated or extended transmitting. The designed duty cycle of these things is 5-5-90. That means receive 5% of the time, transmit 5% of the time, and remain silent 90% of the time, and all that revolves around battery life expectations and component life. If you have an external power supply for the radios, battery life and receive time becomes moot, but the transmit time does not.
Reprogramming for a lower power output may help a some for desense, cooling, and power consumption, but it won't really make much difference in the actual usage. Either way, you'll have to come up with a way to keep the transmitter PA cool or suffer the consequences of using it beyond the design limitations.
I don't know how they put the smoke and smell into the components, but when you do something that lets the smoke and smell out, they never work right again.
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Isn't it illegal to use a two way radio for hunting anyways?
bezking
Member
FCC rules citation please...
n5ims
Member
- Joined
- Jul 25, 2004
- Messages
- 3,993
FCC doesn't care, but several states have laws against using communications devices to "aid a person in pursuing or taking of deer" as indicated by this example from Ohio Deer Hunting Regulations (see the section "A Hunter CAN do the following:" where item 7 states "Possess a communication device as long as you do not use the device to aid a person in pursuing or taking of deer.").
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Good luck with that.
Ok, all done and running, Thanks a lot for those who took a real interest in this project, Duplexer and a whip with a 3db gain. It don’t get more compact than that. Now I can keep in communication with the wife and daughter back at camp. Those who took an alternative interest well maybe you should keep an open mind the next time. I don’t hunt deer I don’t even own a gun I hunt with a digital SLR
Image FX
Image FX
Ok, all done and running, Thanks a lot for those who took a real interest in this project, Duplexer and a whip with a 3db gain. It don’t get more compact than that. Now I can keep in communication with the wife and daughter back at camp. Those who took an alternative interest well maybe you should keep an open mind the next time. I don’t hunt deer I don’t even own a gun I hunt with a digital SLR
Imagefx.ca
Imagefx.ca
wuzafuzz
Member
bren66, I don't think people were closed minded at all. You twice said that you were "hunting" but never mentioned a camera. The use of the word "hunting" will almost always be interpreted as the taking or killing of game. Absent a qualifying statement, such as "hunting with a camera," that is how the vast majority of people will interpret "hunting."
Viewed in that light, I believe those folks were being helpful when raising the question about the legality of "hunting" with radios. If you were indeed taking game while using radios, wouldn't you be appreciative of people informing you such an act has arrest/citation potential? Of course you would be free to make your own decisions, but information is almost always helpful.
Also, remember that once a thread is started it can veer off in many directions, often to the benefit of others reading it. Maybe, just maybe, the person who asked about the legality of radios for hunting was genuinely curious, as opposed to coming from an accusatory perspective.
Glad to hear your setup is working for you! BTW, your website is quite nice, with some great photos.
Viewed in that light, I believe those folks were being helpful when raising the question about the legality of "hunting" with radios. If you were indeed taking game while using radios, wouldn't you be appreciative of people informing you such an act has arrest/citation potential? Of course you would be free to make your own decisions, but information is almost always helpful.
Also, remember that once a thread is started it can veer off in many directions, often to the benefit of others reading it. Maybe, just maybe, the person who asked about the legality of radios for hunting was genuinely curious, as opposed to coming from an accusatory perspective.
Glad to hear your setup is working for you! BTW, your website is quite nice, with some great photos.
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kpoe_28
Member
Would something like this work for your needs, they'll include two motorola cable's kinda a plug & play system. They also sell duplexer and will tune to your freq's at no charge. I bought a Puxing PX-888 from them with no trouble. Radioshop888 KG-UVD1P VX-8R VX-3R VX-7R VX-170 KG-699E KG-669 KG-689 PX-777 PX-888 FT-897 FT-857 VX-177 VXA-300 KG-679 VEV-3288S V-1000 TG-UV FT-817ND FT-60R FT-897 FT-857 VX-7R VX-7RB VX-6R VX-3R FT-1802M FT-8800R VX-170 FT-8900R FT-2800M FT-7800R P
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