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Antenna R&D
Balun loss and the CM7777
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<p>[QUOTE="SWHouston, post: 80013, member: 4580"]Tim, It kinda depends on the circumstances....</p><p></p><p>The CM7777 has an output of 23dbVhf/26dbUhf with Coax Power Inserter.</p><p></p><p>The 300 ohm (input) Preamps are...</p><p>Winegard AP4800 which is UHF only @ 28db and 110v separate power cable.</p><p>Channel Master CM0064 16dbVhf/23dbUhf with Coax Power Inserter, and</p><p>Channel Master CM0264DSB 16dbVhf/23dbUhf with Power Inserter.</p><p>(these are the only 300ohm that I'm aware of)</p><p></p><p>Given the drop in output, I'm not sure that you'd be gaining much</p><p>unless you were replacing a real crappy Balun.</p><p>Then, one should consider justification in the additional cost of Twin Cable and Amp.</p><p></p><p>I know that 300 is as low loss as you can get, but, I've never liked that stuff,</p><p>and given its vulnerability to interference, I think I'd stay with Coax.</p><p></p><p>PS:</p><p>I know there are some others of these amps, but keeping up with them (available/discontinued) is like killing Roch's. So, if you've found</p><p>one/others that are available, post um ! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" />[/QUOTE]</p><p></p>
[QUOTE="SWHouston, post: 80013, member: 4580"]Tim, It kinda depends on the circumstances.... The CM7777 has an output of 23dbVhf/26dbUhf with Coax Power Inserter. The 300 ohm (input) Preamps are... Winegard AP4800 which is UHF only @ 28db and 110v separate power cable. Channel Master CM0064 16dbVhf/23dbUhf with Coax Power Inserter, and Channel Master CM0264DSB 16dbVhf/23dbUhf with Power Inserter. (these are the only 300ohm that I'm aware of) Given the drop in output, I'm not sure that you'd be gaining much unless you were replacing a real crappy Balun. Then, one should consider justification in the additional cost of Twin Cable and Amp. I know that 300 is as low loss as you can get, but, I've never liked that stuff, and given its vulnerability to interference, I think I'd stay with Coax. PS: I know there are some others of these amps, but keeping up with them (available/discontinued) is like killing Roch's. So, if you've found one/others that are available, post um ! :)[/QUOTE]
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Balun loss and the CM7777
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