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#1
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2m receiver.
Hello,
I'm looking to rig up a cheap way to monitor the local repeater without having to invest in a complete transceiver. I've just gotten into VHF ham radio (HF is more familiar to me). I'm not too strong in making radio receivers, but I made VCO's, so I have some homebrew skills:-) I need a 2m receiver circuit, with good selectivity and stable frequency. I've seen some easy to build circuits with good performance on Motorola IC's, but I can't find that circuit in my country. Well in my country there is a bit difficult to buy any kit or specific parts, so I will do everything from parts I could find at local radio shack store. Any suggestions/help would be greatly appreciated. Thanks, Edgar 73! |
#2
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Cheap scanner from your local Buy & Sell paper?
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
#3
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Cheap scanner from your local Buy & Sell paper?
-- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
#4
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Gregg wrote in news:ZF1Gb.21839$6b2.4981@edtnps84:
Cheap scanner from your local Buy & Sell paper? BUY something?? Sort of misses the point of posting to rec.radio.ameteur.HOMEBREW, doesn't it? Anyway, none of us have any money! ;-) For my money, I would probably follow a design of a crystal controlled RX (one channel with probably the same drift as the TX you want to hear!). There are several designs for this, but consider a few small things first: 1. How local is local? Is the repeater within ~10km - and is there another powerful signal on a close frequency)? If there is a powerful local signal, you might have to select your design to be more selective. 2. What aerial can you have? Again, if the repeater is strong and the other close signals are weak, you can use a very simple radio and still get good results. 3. How much radio building and fault-finding experience you have. |
#5
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Gregg wrote in news:ZF1Gb.21839$6b2.4981@edtnps84:
Cheap scanner from your local Buy & Sell paper? BUY something?? Sort of misses the point of posting to rec.radio.ameteur.HOMEBREW, doesn't it? Anyway, none of us have any money! ;-) For my money, I would probably follow a design of a crystal controlled RX (one channel with probably the same drift as the TX you want to hear!). There are several designs for this, but consider a few small things first: 1. How local is local? Is the repeater within ~10km - and is there another powerful signal on a close frequency)? If there is a powerful local signal, you might have to select your design to be more selective. 2. What aerial can you have? Again, if the repeater is strong and the other close signals are weak, you can use a very simple radio and still get good results. 3. How much radio building and fault-finding experience you have. |
#7
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In article ,
says... Hello, I'm looking to rig up a cheap way to monitor the local repeater without having to invest in a complete transceiver. I've just gotten into VHF ham radio (HF is more familiar to me). I'm not too strong in making radio receivers, but I made VCO's, so I have some homebrew skills:-) I need a 2m receiver circuit, with good selectivity and stable frequency. I've seen some easy to build circuits with good performance on Motorola IC's, but I can't find that circuit in my country. Well in my country there is a bit difficult to buy any kit or specific parts, so I will do everything from parts I could find at local radio shack store. Any suggestions/help would be greatly appreciated. Thanks, Edgar 73! Look at the chips in the Philips SA604AD/SA605AD line. They're great for FM receiver construction. -- jm ------------------------------------------------------ http://www.qsl.net/ke5fx Note: My E-mail address has been altered to avoid spam ------------------------------------------------------ |
#8
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Elektor Magazine did a 2M FM receiver a few years ago. They have good
quality PCBs so most of the job is done. The only problem was that the oscillator was free running and tunable. This might not be stable enough. In this case I would suggest a crystal osc for a single frequency, multiplied up. If you want it programmable, you will have to use a PLL circuit, and things start to get a bit harder. Could you try E Bay for an old FM rig and modify it? Richard Edgar wrote in message ... Hello, I'm looking to rig up a cheap way to monitor the local repeater without having to invest in a complete transceiver. I've just gotten into VHF ham radio (HF is more familiar to me). I'm not too strong in making radio receivers, but I made VCO's, so I have some homebrew skills:-) I need a 2m receiver circuit, with good selectivity and stable frequency. I've seen some easy to build circuits with good performance on Motorola IC's, but I can't find that circuit in my country. Well in my country there is a bit difficult to buy any kit or specific parts, so I will do everything from parts I could find at local radio shack store. Any suggestions/help would be greatly appreciated. Thanks, Edgar 73! |
#9
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Elektor Magazine did a 2M FM receiver a few years ago. They have good
quality PCBs so most of the job is done. The only problem was that the oscillator was free running and tunable. This might not be stable enough. In this case I would suggest a crystal osc for a single frequency, multiplied up. If you want it programmable, you will have to use a PLL circuit, and things start to get a bit harder. Could you try E Bay for an old FM rig and modify it? Richard Edgar wrote in message ... Hello, I'm looking to rig up a cheap way to monitor the local repeater without having to invest in a complete transceiver. I've just gotten into VHF ham radio (HF is more familiar to me). I'm not too strong in making radio receivers, but I made VCO's, so I have some homebrew skills:-) I need a 2m receiver circuit, with good selectivity and stable frequency. I've seen some easy to build circuits with good performance on Motorola IC's, but I can't find that circuit in my country. Well in my country there is a bit difficult to buy any kit or specific parts, so I will do everything from parts I could find at local radio shack store. Any suggestions/help would be greatly appreciated. Thanks, Edgar 73! |
#10
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Thanks to everyone, I found pretty easy to build 2m receiver. And it is
working quite well, all I have to do is to find box to it. Well digital readout would be advantage, but I'll try to manage it later. Maybe on 2004. Happy DX next year. Your sincerely, Edgar 73! |
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