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Topic: Anyone Def Yet?"
cliffyk

Replies: 10
Views: 12157
PostForum: FM transmitters   Posted: Sun May 20, 2012 2:49 am   Subject: Anyone Def Yet?"
OK 7-year old thread, however I just got a new spectrum analyzer (I.e. "toy") and in educating myself about its capabilities I recorded the spectra of one of the last surviving HD radio broa ...
Topic: MaxPro1 Rf Transistor Upgrades
cliffyk

Replies: 28
Views: 26438
PostForum: FM transmitters   Posted: Tue Nov 14, 2006 1:25 am   Subject: MaxPro1 Rf Transistor Upgrades
Providing detailed information for re-engineering the MaxProI to use the 2SC2539 would be a decidedly non-trivial task, and as the fellow from Norwalk Electronics stated;

"This would not be a ...
Topic: How much gain with SWR- meter?
cliffyk

Replies: 16
Views: 15485
PostForum: Users share experience...   Posted: Tue Sep 19, 2006 8:04 pm   Subject: How much gain with SWR- meter?
Antennas sold as "requiring no tuning" perform acceptably within the band for which they are intended--I.e. they may have an SWR of 2.0:1 at one end of the band, 1.0:1 somewhere in the middl ...
Topic: How much gain with SWR- meter?
cliffyk

Replies: 16
Views: 15485
PostForum: Users share experience...   Posted: Mon Sep 18, 2006 9:16 pm   Subject: How much gain with SWR- meter?
There are many excellent "beginner" and seasoned pro tutorials on SWR (more correctly VSWR) available on the web--search Google for "Understanding SWR", "SWR tutorial", & ...
Topic: How much gain with SWR- meter?
cliffyk

Replies: 16
Views: 15485
PostForum: Users share experience...   Posted: Sun Sep 17, 2006 9:11 pm   Subject: How much gain with SWR- meter?
I'll start by clearing up what I perceive as a misconception. An SWR meter by itself does nothing to improve the strength of your radiated signal--it's just a tool that lets you monitor the matching o ...
Topic: Cooling the amp
cliffyk

Replies: 4
Views: 4117
PostForum: FM transmitters   Posted: Fri Aug 04, 2006 12:26 am   Subject: Cooling the amp
When dealing with a heat generating sources within an enclosure I tend to prefer to pull the heat out, with make up air being delivered through strategically placed louvers/perforations/etc. I don't ...
Topic: Cooling the amp
cliffyk

Replies: 4
Views: 4117
PostForum: FM transmitters   Posted: Thu Aug 03, 2006 9:09 pm   Subject: Cooling the amp
Hot air out, preferably with the heatsink located somewhere in the airflow's general path--unless...

You have a good way of directing the flow of air you are pushing in.

In my [url=http://www.pa ...
Topic: solar power
cliffyk

Replies: 10
Views: 6888
PostForum: FM transmitters   Posted: Sat Jul 29, 2006 9:36 pm   Subject: solar power
[url=http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/EEIndex.html] Read this, then come back here and ask questions.

You'll need to garner a basic understanding of electrical and electroni ...
Topic: solar power
cliffyk

Replies: 10
Views: 6888
PostForum: FM transmitters   Posted: Sat Jul 29, 2006 2:34 pm   Subject: solar power
Cool...
Topic: solar power
cliffyk

Replies: 10
Views: 6888
PostForum: FM transmitters   Posted: Thu Jul 27, 2006 11:46 pm   Subject: solar power
The inverter for the laptop will be grossly inefficient, output from the solar panels will be reduced on overcast days (dependent on the amount of overcast of course)--so you'll need to have a large e ...
Topic: 350mW or 1 watt.... HOW CAN I TELL!!!!
cliffyk

Replies: 13
Views: 11074
PostForum: PCI MAX transmitters   Posted: Sat Jul 22, 2006 2:43 pm   Subject: 350mW or 1 watt.... HOW CAN I TELL!!!!
what kind of instrument are u using for this mesurment?
wattmeter Telewave 44A.

The 44A is rated for +/- 6% accuracy at FM broadcast band frequencies, this is +/- 6% of full scale. So at the 5W s ...
Topic: MaxPro I & SE3+ Performance metrics
cliffyk

Replies: 1
Views: 2877
PostForum: FM transmitters   Posted: Sat Jul 01, 2006 12:24 am   Subject: MaxPro I & SE3+ Performance metrics
I have at last found time to perform some solid analysis of the real-world performance of my MaxPro I/SE3+ package--the [url=http://www.paladinmicro.com/documents/Measurements20060630a.pdf] .PDF file ...
Topic: Anyone Def Yet?"
cliffyk

Replies: 10
Views: 12157
PostForum: FM transmitters   Posted: Wed May 24, 2006 12:27 am   Subject: Anyone Def Yet?"
Oh, BTW, if the "masses gave a rat's backend about fidelity do you really think that nearly every commercial broadcaster would put out the compressed to 45 dB dynamic range, +20 dB bass boost, ov ...
Topic: Anyone Def Yet?"
cliffyk

Replies: 10
Views: 12157
PostForum: FM transmitters   Posted: Tue May 23, 2006 10:43 pm   Subject: Anyone Def Yet?"
You are correct in pointing out that I should have qualified my comments as to their distinct relation to the FM implementation of HD Radio--the AM incarnation is quite innocuous and will I suspect be ...
Topic: Anyone Def Yet?"
cliffyk

Replies: 10
Views: 12157
PostForum: FM transmitters   Posted: Tue May 23, 2006 7:46 pm   Subject: Anyone Def Yet?"
HD Radio (HDR) is a load of rubbish, part of a scam power-grab being bullied through by the NAB and a bunch of other people that think they can make bunch of money by exploiting the FM broadcast band. ...
Topic: audio processing
cliffyk

Replies: 3
Views: 4554
PostForum: Users share experience...   Posted: Sun May 07, 2006 2:14 pm   Subject: audio processing
PC sound card based solutions are really neat, and there's a lot of very competent freeware stuff out there, however there are a couple of issues to be aware of:


They can be inexpensive IF you ha ...
Topic: audio processing
cliffyk

Replies: 3
Views: 4554
PostForum: Users share experience...   Posted: Sun May 07, 2006 5:31 am   Subject: audio processing
Anything from Behringer is top-notch, many of the "composer" units can do exactly what you wish to do--poke around at their website and you will learn a lot...
Topic: vhf amp question
cliffyk

Replies: 4
Views: 8049
PostForum: Schematics - help and ideas   Posted: Sun May 07, 2006 5:22 am   Subject: vhf amp question
There seems to be some part of "designed to operate between 136-175mhz" that you don't understand...

Seriously though, there are many "HAM" amps that can be re-engineered to ope ...
Topic: Stereo/Mono question Max Pro III Can someone help pleeeese?
cliffyk

Replies: 7
Views: 7153
PostForum: FM transmitters   Posted: Fri May 05, 2006 12:51 am   Subject: Stereo/Mono question Max Pro III Can someone help pleeeese?
Mea culpa as well, I hadn't paid any attention to the original posting date...
Topic: Stereo/Mono question Max Pro III Can someone help pleeeese?
cliffyk

Replies: 7
Views: 7153
PostForum: FM transmitters   Posted: Wed May 03, 2006 12:53 pm   Subject: Stereo/Mono question Max Pro III Can someone help pleeeese?
Pre-emphasis is applied to the each audio channel independently, after the 15 kHz low-pass filtering, and prior to stereo encoding.

It is ususally (in our class of broadcasting) applied by the ste ...
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