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Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
My recever was still intact somewhat. I removed the dust and put it together and powered it up. I did receve a repeated morse transmittion, but I don't understand the language. A long keyed pause comes after the message. This transmittion peaked around 25db above the noize floor.
This 5W beacon is located in Greenly On, Canada. I emailed the guy about my contact.
I found that using a EMI filter transformer(usually found in SMPS) on your audio line to your PC, this helps eliminate a lot of interference from your computer.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
The message means "From VE3TO beacon. (not sure about the 5n25 bit) Antenna is a vertical"
Its a sort of short hand hams use with morse code to shorten transmissions.
Chris and I are discussing a receiver design that should ensure best possible results with a relatively cheap and simple circuit. The only real expense for most people will be the crystal(s), at $5-$8 each.
It could be easily made to support anywhere from 1 to 4 bands, and cover about 10Khz of the given band without too much trouble.
For the september test, I may consider producing a single or two band kit, if I hear any interest.
... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
That sounds great, ShawnLG. If I'm not mistaken, a 25dB SNR would correspond to being about 4 S-units above the noise, which is great for a 5W beacon. When I transmit QRSS, I am for about 500mW or so of output power, which means if the path losses are the same, my signal would be 10dB weaker than his. However, switching to QRSS10 should provide roughly 20dB of gain, so with a little luck, you should see me in there with some good signal strength.
Also, now you know his frequency, so you can tell exactly where you are in the band.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
It was about a week ago when I went up onto the roof and reconnected my TV antenna cable. On the last beacon attempt, in a rush to get a dipole up in the back garden I simply cut the coax going to my TV aerial and re-routed it to the dipole. When I took the dipole down, I (lazily) just cut the coax again and left it dangling there.
I'd be up for another reception attempt, if I can find the time to make another dipole and put it up. I didn't manage to pick anything up last time, even though I think my reciever was working fairly well (I had a strong signal on about 10.140Mhz from some US station). If anyone's interested, I could post the schematic for my receiver, but I'd have to reverse-engineer it first because I made it up as I went along! To be honest it's probably a load of rubbish that I just think works
I used the crystal penning technique to modify some 10.240Mhz crystals towards 10.140Mhz, with quite a bit of sucess. If anyone wants to have a go at that I have quite a few of those crystals going spare, just give me a shout.
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Beacon Reception -- Any Interest?
and re-routed it to the dipole. When I took the dipole down, I (lazily) just cut the coax again and left it dangling there.