Re: [softrock40] Internal Sound Card Problems?
- Vehicles parts shops are usually a good source for copper tuning as it's usually used in brakes systems.Other sources may be air conditioning, refrigerator/freezer repair shops and gas shops.RegardsLawrence
Da: Ulf Holt Gmail <ulf.holt@...>
A: "email@example.com" <firstname.lastname@example.org>
Inviato: Lunedì 26 Novembre 2012 3:54
Oggetto: Re: [softrock40] Internal Sound Card Problems?
Mike, you always ask the right questions!Well, below sub standard is an understatement, and I will try to fix the problem before going any further. Main problem is to find parts for an antenna, since my Thai is none existing, and it's hard to find a shop when you cannot ask people for directions. I think I will go for a magnetic loop, and got a description where I need 32" of 1" aluminum tube, bent to form a circle, and a coax inside. I will be able to get a coax, but here in Pattaya I have no ideas where to get the aluminum, but I'll be going to BKK next week, and I'm sure I can find what I need in Chinatown. Only problem with this construction is that the aluminum tube should be grounded, and ground is non-existing in the building where we live.73 de LA2SLUlfWhy?
You you're self said your antenna is below sub standard ...
If the spikes are still obstructive .... with a good antenna, that's a good time to deal with the soundcard....
I only have 2 spikes above my local noisefloor (besides the center)... lots with no antenna .... I work around the spikes if I realy need to ... ie shift lo some and copy away!! But not usually needed.
Date: Mon, 26 Nov 2012 08:21:53 +0700
Subject: [softrock40] Internal Sound Card Problems?
I have now tested my SoftRock RX Ensemble II for some time. I still don't have access to an antenna I can be proud of, my only antenna so far is a short line on the balcony, surrounded with concrete walls on 3 sides.I have tried the following software:PowerSDR-iq, HDSDR, Winrad and Rocky. All seem to work, but I wonder if I need a better sound card. I can observe the following:PowerSDR-iq shows a 50 dB peak at a frequency ca 12 khz below the center frequency, and a lot of smaller peaks at frequencies higher than the center frequency.HDSDR does not have the same quality on the Spectrum as the Panadapter in PowerSDR, but indicates a +50 dB peak at the center frequency and some smaller peaks at higher frequencies. It also shows that the signal is + 10 - 15 dB over S9, without an antenna hooked up.Rocky shows the same kind of information, but is harder to evaluate.I have screenshots of these things, but I don't know if it is possible to attach pictures to this group.Does this inidcate I should go for a better sound card?73 de LA2SLUlf
- Similar to Lawrence's suggestion: I live on the 18th floor and the space at the ground level below is a parking lot. I used #24 hookup wire, 130 or so feet on a side, in an inverted vee with the apex on my balcony. the ends are tied to some 15 pound test fishing line which is tied off on the security fence on the far side of the parking lot (tied off at about 4A on a dark night :-) ), as far to the left and right as I could do it. The angle of separation is about 90 degrees. I use an inexpensive MFJ tuner and a very short length of twin lead to connect the antenna to my various RXTX and Peaberry. There is nothing magic about the length but I wanted it to be long enough that I could tune it for 160. The antenna is absolutely invisible and works great.... check my WSPR spot logs.
Many folks swear by the mag loop and I have no evidence to rebut them. But I like wire.... a lot of wire!
Where there is a will there is a way!
Stealth Amateur Radio from Beijing
CW, BPSK31, and WSPR on 160 - 10 Meters
--- In email@example.com, Lawrence Galea <galea_lawrence@...> wrote:
> I don't know if you are able to do this, but anyway here is a suggestion.
> A very thin winding wire protected by winding it a few turns every foot and perhaps tying it every foot or so to a very thin nylon fishing line will be nearly invisible. As floors are normally about 3 metres high, taking it up from your balcony to the roof will be about 45 metres or more if you extend it horizontally on the roof which will be a good antenna to play with. During the night you can extend its separation from the walls by using a fibreglass fishing rod attached horizontally to your balcony.
- > On 25 Nov 2012, at 18:54, Ulf Holt Gmail <ulf.holt@gmail. com> wrote:
> > I think I will go for a magnetic loop, and got a description where I need 32" of 1" aluminum tube, bent to form a circle, and a coax inside. I will be able to get a coax, but here in Pattaya I have no ideas where to get the aluminium,A bicycle wheel rim is also suitable. While aluminum is preferable, steel will work as well. Take out the spokes and away you go.http://www.aa5tb.com/loop.html
Many guys seem to shy away from magnetic loops. I don't why as they are easy to make, they don't need height and they work splendidly.On 26/11/12 14:21, Tom Clifton wrote:> On 25 Nov 2012, at 18:54, Ulf Holt Gmail <ulf.holt@gmail. com> wrote:
> > I think I will go for a magnetic loop, and got a description where I need 32" of 1" aluminum tube, bent to form a circle, and a coax inside. I will be able to get a coax, but here in Pattaya I have no ideas where to get the aluminium,
A bicycle wheel rim is also suitable. While aluminum is preferable, steel will work as well. Take out the spokes and away you go.
Repeating myself, my first was made of 3/8" diameter soft copper tuned with a variable capacitor that was only capable of 7W before it would arc over and placed indoors on the upstairs landing I worked all over Europe with it on 40m. Within less than an hour this loop was built and working. I used the small coupling loop with this one.
My present loop is 8' diameter octal with 22mm copper pipe and 45 degree copper elbows tuned with a vacuum capacitor that takes the full 100W.
The one being rebuilt after it crashed in 60+ mph winds is a 13' diameter of 28mm copper tube constructed with 45 degree elbows as the current one. With this one and 100W all my 80m contacts Stateside have been made with good reports both ways.
The aa5tb loop page also has pointers to many more magnetic loop information sources.
BTW I have found gamma matching for me has been easier than trying to adjust the small coupling loop.
You can't beat magnetic loops for ease of construction and operating.
73 ... Sid.
-- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Senior Staff Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all Computing Tasks