We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - moof

Pages: 1 ... 3 4 5 6 7 8 9 10 [11] 12 13 14 15
I was lost a quarter of the way in.  You can watch the auction sites and buy them a box at a time for 50 cents to a buck apiece.  I'm not quite a crystal hoarder.  Yet.

Equipment / Re: Antenna Tuner
« on: November 01, 2013, 2137 UTC »
If I have my matcher (used for transmitting) purposefully set way bad, yes, I can take a hit of several S units and reception is a little worse. I don't think I can really set it to make reception better than running the antenna straight in the radio.
Maybe what you want is a preselector with a preamp.  I can't remember the model I had 15 years ago, but it wasn't MFJ, about $70 back then.  It was an active indoor antenna, had frequency selection knob, and preamp on-off.  It made a good difference with my large portable radio.  Something fried in it after 5-6 years but it was good while it lasted.

The RF Workbench / Re: Bicycle Mounted Piracy...
« on: October 29, 2013, 2316 UTC »
Jeesh how could you do 40 meters on a bike?  A commercial coil and extree long whip which I may have used is like 9 feet tall on top of the car.  I might have had trouble with overpasses and trees and stuff.  I may have taken things for a drag down the highway a few times and not been heard at all running 10 watts.  I might have given up after halfa dozen times.  CB range/10/11 meters I think would be the only realistic thing without being a freak magnet for the popo.  You will attract enough attention with an antenna of any sort on a bike.  And even if you did have a 10 foot monstrosity coming out of the bike, the ground plane would be nonexistent. You could get at least a few miles I bet but don't know about NVIS regional stuff.  I would bet against getting out regionally like that.
Maybe consider a 10 meter up to 25 watt radio that runs on 12VDC?  Cheap Radio Shack 20 year old ssb radio on the cheap(HTX 10 or 100 is it?), 12 v gel cell, coiled CB antenna cut to resonance?

Equipment / Re: Help with Antenna Location
« on: October 15, 2013, 2142 UTC »
Remember KISS.  If you run 30 feet to the chimney or across the front and it sucks, aint no way running an extra 50 feet won't suck.
I'd buy a 100ft reel of relatively thin gauge stranded wire for under 10 bucks, run it north-south to the chimney or out back to the shed far away from the power line, and see what happens.  If it works out, then maybe try a loop as well around the house rafters or along the fence.  You will know real fast if you have terrible power line problems like me.  Good luck!

Equipment / Re: Help with Antenna Location
« on: October 15, 2013, 1509 UTC »
Skinny longwire out the window, as high over the AC as possible, and back to the shed if you can swing it.  To the chimney if you just want to give it a quick try and not burn up an extra 50 feet.  Don't go anywhere near the central back yard where the power line is.

The RF Workbench / Re: Legal Issues
« on: October 13, 2013, 2033 UTC »
It's a bit dated to say the least.  "Have at least two turntables" "get an Electro-Harmonix preamp for $20 and a ham radio used for $50" and it recommended FM, having a whole studio...
If you google 'download Complete Manual of Pirate Radio' the scribd.com link is safe and has the entire thing.
Fun from a historical point of view.  Innernet makes it so much easier today to get better information.

Oh, and go to the fcc site to look at the latest field citations.  hahahahahaha you can't.  Gubmint is shut down.

HF Mystery Signals / Re: Mystery signal question
« on: September 20, 2013, 2032 UTC »
My old cell phone charger used to do a rhythmic warbling thing lasting 5-10 seconds per cycle until it was charged.  Sounded somewhat similar to the file in the first post.  Radio had to be less than 10 feet away tho.

The RF Workbench / Re: Measuring transmitters with an oscilloscope
« on: September 10, 2013, 0232 UTC »
I wish I knew how to use an oscope. I depend on jamming the output into a meter and tweaking the coils.  A rat shack meter made for the cbers will give you a close reading. Get something else if you want better than within 25%. If you blow it up you are out 40 bucks. It has a 20 watt scale and I have found it to be a good indicator. Not super accurate but what's a dummy to do?

The RF Workbench / Re: what power source and modulator used ? ?
« on: September 07, 2013, 2100 UTC »
For your simple 10 watt deal, aint no way to go other than 12 volt 7-8 amp hour rechargeable battery. Or larger capacity.
If the builder is going to the trouble of building the amp part, they might as well build the simple modulator part as well and build for whatever input they plan on using.  Me, I like standard 1/8 inch stereo plug so you can use walkman, Mp3 player, Victrola, hell, you could could play your hour long guitar solo if you ran your headphone guitar amp into the transmitter box. I might have tried it :\  Or you can get your 1970 KMart cassette deck and run Pre-Cambian hippie noise into the thing.  No that isn't a band.
I don't do the hard mixing board stuff or line level vs headphone level.  It just needs to work with headphone output and run on a couple pound 12 v battery.

The RF Workbench / Re: A simple shortwave pirate transmitter build
« on: August 29, 2013, 0202 UTC »
Me too! Radioanarchy guerrilla was my first try and he was very helpful with my newbie questions years ago.  Mine does 3 watts into improvised dipole which to me was unexpectedly low but it runs cool and doesn't need an extra fan.  I really like the channel Z design on the yahoo pirate group. Very clear instructions. It does have 1 obscure choke part and some ferrite rods that you can find on hosfelt.com or overseas on amazon.  It needs a fan but worked great first time for me every build. Does 6 watts minimum for me. Maybe 8. Maybe 10 on dummy load.

Equipment / Re: Receiver Question
« on: August 28, 2013, 0401 UTC »
R75 no doubt. But like pigmeat says, if you can get a drake r8 for $400, well I had one and listened to pirates in the early 90s with a 20 foot chunk of wire hung around the ceiling of a first floor apartment. That's the only piece of equipment I sold I wish I had back.

The RF Workbench / Re: A simple shortwave pirate transmitter build
« on: August 28, 2013, 0157 UTC »
I burn wire and scrape with xacto knife too!  A simple approximate dipole ought to get over 100 miles with good conditions but will be weak.  Then if that works, step up to a 10 watt design which is no more difficult just more parts. And no you won't get a full 10 but it will be over 10x more power.

The RF Workbench / Re: Components to have on hand ?
« on: August 19, 2013, 1708 UTC »
You should always have enough for several complete projects on hand!
Mouser, followed by Digikey and Jameco.
Amazon if buying other stuff and I only needed 1 thing or I have some Amazon bucks to burn.  I have found one obscure part I needed on Amazon I could find nowhere else unless I bought a zillion.
pl-259.com for obscure hardware, especially antenna.
toroids.info for umm toroids.
Ebay for all out of production stuff, project boxes, and enameled wire.

enough to tell there is an AM signal with a little sound.  real rough.

Hell I loved STs.  Life blew up for me after their 3rd album so that is all I'm familiar with.  Could have done without the occasional rapping type sh*t.  Rock on PPV.

Pages: 1 ... 3 4 5 6 7 8 9 10 [11] 12 13 14 15