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Messages - redhat

Pages: 1 ... 3 4 5 6 7 8 9 10 [11] 12 13 14 15 16 17 18 19 ... 106
151
Equipment / Re: Looking for Linear Power Supply
« on: March 11, 2021, 0100 UTC »
I saw the pics...I wouldn't put that on the air if I were you.  It also isn't built with enough heatsink to be reliable.

152
My money is on a bad IC.  It probably got zapped when you built it...I've had similar happen with CMOS devices.

+-RH

153
Equipment / Re: Looking for Linear Power Supply
« on: March 10, 2021, 2339 UTC »
here are the Specification :

Power Input       =  30-100 Watt SSB
Output Power    =  800 Watt
Voltage              =  17-20 Vdc
Transistor          =  8 units IRFP150N  ( Many in Ebay for $ 2 each )
Frequency         =  2 Band 3,5-14 Mhz,
                              3.8Mhz = 600 Watt , Peak
                              7 Mhz = 800 Watt.  Peak Power
                              11 Mhz = 500 Watt, Peak
                              14 Mhz = 300 Watt , Peak

Oh god no...

Do the innerds look like this?


Another piece of sound advice...don't buy semiconductors off ebay.  Many times the devices are restamped versions of smaller devices and they will fail prematurely...especially if the come from overseas.

+-RH

154
Equipment / Re: Looking for Linear Power Supply
« on: March 10, 2021, 2335 UTC »
I think we're more interested in the amplifier itself, i.e. why the strange voltage requirement.  Most stuff is going to expect either 12 or 24VDC for supply.  I've never seen anything RF related that required 18-20VDC.
+-RH

155
Equipment / Re: Looking for Linear Power Supply
« on: March 10, 2021, 1847 UTC »
Commonly available 24V smpsu's all over eBay.

If you think they're manufactured in any other place than CH, think again! They aren't made in the US..

Despite the bad rep it mainly down to ignorance as they are in the main absolutely fine.

Try and stick with a branded version like; JCPOWER or MEANWELL.

Just parrallel up what you need 3x500W or 2x750W or whatever.

24V will adj down to 18V.

Btw, you're looking for a power supply for your linear, not a linear power supply as that's an analogue, i.e. not switching lump with a massive transformer etc.

Str.

Agreed.  Why the strange voltage?  Most switchers are adjustable to some degree, but 18 is not a standard voltage.  A 24V supply should have enough range to drop to 21V or so, but that's about it.

+-RH

156
Got 'em here @ 0217z with a female vocal.  Listenable when above the noise.
0230 Sounds like Aerosmith 'Come Together'
Following a period of rapid deep fades, making a comeback with what shazam is calling Parliament's 'Together'.  About S6 now.
0254 Janet Jackson 'Together Again' S7, to deep fades under the noise.
0309 'We Belong Together' Randy Newman per shazam.

Thanks for the show!

+-RH

157
Software / Re: audio editing software
« on: March 04, 2021, 1931 UTC »
there was only one studio copy of Outhouse Radio ever made because i prefer live and on the fly.
closest thing you'll find is some of the of air recordings posted on the net by various dxers .
to me sitting back and broadcasting a prerecorded show was a bit on the boring side(relays are a different animal) . but that's me not you , so have fun no matter how you do it ...
 8)

It does turn into a one person drinking game pretty quickly.  Not much to do but listen to the generator hum and watch meters move and lights flash.

+-RH

158
Software / Re: DRM heavy childbirth 02 Mar 2021
« on: March 04, 2021, 1926 UTC »
Of course, signal measurements are rather meaningless without some SNR or noisefloor measuring.  S9 for me likely would not be enough due to my high suburban noise floor.  Likewise in a quiet rural setting s5 may be enough.

Not to be too snarky, but S9 is -73dbm.  Therefore S9+20 is -53dbm.

+-RH

159
Software / Re: DRM heavy childbirth 02 Mar 2021
« on: March 03, 2021, 0023 UTC »
This is why I am perfectly happy to watch DRM fall on its face.  Either open source both transmission and reception, or kill it.

+-RH

160
Huh? / Re: Maple Sugaring Question
« on: February 25, 2021, 1856 UTC »
A friend and I would swap beer for syrup when doing the Dayton hamfest every year.  I would bring up some of the local brew, and he would trade a few quarts of Wisconsin maple.  When they moved the Dayton fest to Greene county several years back, I passed a house on the side of the road one morning selling syrup.  I stopped and picked up a few quarts.  I was surprised, I had no idea such a thing was conducted even in Ohio.

+-RH

161
Huh? / Re: 1560AM going bye-bye in NYC? Here's why.
« on: February 19, 2021, 1858 UTC »
Prices in the city are insane.  See any of Louis Rossmann's videos for more on the subject.

+-RH

162
AKM makes a lot of ASIC's for audio applications.  I have digital Behringer gear with AKM IC's in it.  This will be widespread across the industry.

Fortunately, TI (Burr-Brown), Cirrus Logic, etc also make competing parts, but redesign doesn't happen overnight.

+-RH

163
Love him or hate him you would have to admit that he did more to revitalize AM radio than anyone or anything else.

+1

+-RH

164
I looked at getting a standalone digital tuner last year.  I was put off from not only the cost, but most of the stations I like to listen to only offer streaming through an app or through their website.  And sorry, but I don't want to tie up my phone or a web session to keep audio going.

+-RH

165
The RF Workbench / Re: Stretchyman 40 W TX Reliability Modifications
« on: February 14, 2021, 0705 UTC »
Boys,

Can we do with a little less hostility?  There is already enough negativity on the web.  If this must continue, please take it elsewhere.

Thanks,

+-RH

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