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Post by part15engineer on Feb 6, 2019 23:51:26 GMT
1x Day Sequerra M4.2s AM/FM HD Receivers 2x Day Sequerra M4FM Analog Modulation Monitors for FM 1x Broadcast Tools Switcher (No PSU) 1x 360 Shortcut (failed hard drive) 1x radyne abr202 1x radyne abr202 (cosmetically damaged) 1x gentner sph3a grey faced model 3x Hamilton am1000 rangemasters 1x homebrew FM stereo agile transmitter, 750mW 88-92mhz 1x Marti 30 watt UHF 1x shure mini microphone mixer 2x Burk remotes with 1 relay panel on is parts one powers on Best offer plus shipping insurance and boxing PayPal, check (must clear), cash with local pickup in Lakewood CO), or USPS money |
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Post by End80 on Feb 7, 2019 0:01:47 GMT
What's going on? You getting out of the hobby?
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Post by part15engineer on Feb 7, 2019 0:44:57 GMT
i got to raid a transmitter shack. it's all surplus from a local station.
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Post by Boomer on Feb 7, 2019 1:25:20 GMT
Whew, after seeing the nice pictures of your station before, glad that you're not getting out of the hobby!
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Post by End80 on Feb 7, 2019 11:01:07 GMT
I can't buy anything but am curious if those Rangemasters are the original crystal controlled units or the frequency agile ones.
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Post by part15engineer on Feb 7, 2019 16:53:13 GMT
they are not agile but are not crystal either they use the new programmable single frequency modules with the daughter board that plugs into the divide IC socket next to crystal socket. these can be upgraded as well to the agile modules.
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Post by Boomer on Feb 7, 2019 21:34:35 GMT
I didn't know there were single frequency boards for Rangemaster now, yet another option. Guessing that they're the programmable oscillator cans that are available, using a header to plug into the IC socket, and they'd use a programmer to burn the frequency you'd need into them.
Boom
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Post by End80 on Feb 7, 2019 22:23:26 GMT
I didn't know that either.
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Post by part15engineer on Feb 8, 2019 1:04:16 GMT
I didn't know there were single frequency boards for Rangemaster now, yet another option. Guessing that they're the programmable oscillator cans that are available, using a header to plug into the IC socket, and they'd use a programmer to burn the frequency you'd need into them. Boom that is what they are |
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Post by Boomer on Feb 8, 2019 16:21:16 GMT
Module HeadThe module idea is the modern way to do it, with crystal manufacturers being scarce these days, and custom crystals are so costly. At Rangemaster's site I see that the retrofit to convert a crystal controlled transmitter is $99, and the price for new frequency modules is either $12 or $22, on two different pages. The site mentions the crystal retrofit plugging into the socket for a 4001. If the 4001 is operated on 12 volts, the retrofit module would need a regulator on it for 3-5 volts for the oscillator can, and possible translation from 3-5 volt square wave output up to 12 v square, if the following circuit needed it. Just exercising my noggin on it, I couldn't find pictures of the setup. PLL frequency control is mentioned as being less stable than module, and I can see the truth in that, but PLL can be very good if designed well, which includes good voltage regulation and shielding, even the 3 chip PLL with 10.240 crystal. The world is looking toward DDS or Direct Digital Synthesis at this point though, but there's nothing like the simplicity of crystal operation on the fundamental frequency, a crystal into a triode tube or JFET, and 5 other parts, to make an oscillator. If you have a junkbox of parts, the old methods work just fine, and you can learn a lot by building so simply! References: am1000rangemaster.com 3 chip PLL circuit (Beware loop filter on 4046 pins 13 and 9 is poor though, replace it) www.tompolk.com/radios/frequencysynthesizer/freqsynth.htmlBoomer
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