JASON users? maybe OT?
I am interested in running a series of experiments at micro level powers on 80 meters. My primary interest is what over comes multi-path due to the atmosphere on 80 meters which affects both frequency and amplitude.
I am attracted to VK2ZTO's FDK ( Wanjina ) which uses two parallel tones and JASON with its two sequencial tones. I would like to exchange ideas with others who have used either or both of these programs.
Is there any soundcard programs available for FDK? Where is the best place to find the latest JASON programs?
Thanks, Stan AK0B ak0b@swbell.net
HiFer NL temp. QRT
Posted by Peter Knol on August 01, 2005 at 10:35:54.
Hello.
A bit of wind and metal fatigue in the wires brought the antenna down last weekend. I have switched off Hifer NL for a while. I'll let you know when it is back on air. Take a look on http://hifer-nl.8k.com for uptodate info !
73, Peter PA1SDB
Re: Reusen Aerial Design - Query
Posted by Manfred on August 01, 2005 at 12:09:29.
In Reply to Re: Reusen Aerial Design - Query posted by John Davis on July 11, 2005 at 21:36:55.
John, Re: JASON users? maybe OT?
you are right. Reuse (German)is a special kind of fishing net.
Google "Reusenantenne" and find interesting results.
Regards
Manfred
Posted by Eric KD5UWL on August 05, 2005 at 22:31:19.
In Reply to JASON users? maybe OT? posted by Stan on August 01, 2005 at 03:41:04.
THE location for Jason is http://www.weaksignals.com/
New Hifer Beacon FX on 13.555.250 Mhz.
Posted by Larry WB3ANQ on August 06, 2005 at 11:17:08.
My friend Bill Farmer has placed a new beacon on the air. Info as follows:
ID is FX sent QRSS 3 with a 24 second dash.
Frequency is 13.555.250 MHz.
Output 2.5 mW
Antenna: Vertical
Location Rockville, MD. FM19kd just North of Washington DC.
You can contact Bill at ssg577ecm@earthlink.net
I am sure he would love to have some reports!!
Thanks
Larry WB3ANQ
Hifer LP 13.554980 Mhz Sawtooth pattern
Larry
Re: New Hifer Beacon FX on 13.555.250 Mhz.
Posted by John Andrews on August 07, 2005 at 20:32:49.
In Reply to New Hifer Beacon FX on 13.555.250 Mhz. posted by Larry WB3ANQ on August 06, 2005 at 11:17:08.
Larry,
Got him tonight up in Maine. Screen shot is at http://www.w1tag.com/files/FX.jpg
Have sent him an email directly.
Former OMEGA-station at La Moure, North Dakota, USA
Posted by Carsen on August 09, 2005 at 06:16:51.
In La Moure, North Dakota, USA was until 1997 an OMEGA-transmitter. What kind of antenna did it use? How tall were the used masts? Why are LORAN-C stations not in the FCC-listings?
What happened with the station after the shutdown of OMEGA? Was it demolished or is it used as transmitter for VLF of the Navy?
Or are its towers now used for FM/TV-broadcasting?
Are pictures in the internet available?
Posted by Herbert Smith on August 09, 2005 at 18:15:04.
Why are LORAN-C stations in the USA, time signal stations of the USA and VLF transmitters of the US Navy not in the FCC-listing ( http://wireless2.fcc.gov/UlsApp/AsrSearch/asrRegistrationSearch.jsp )? Re: Why are LORAN-C stations not in the FCC-listings?
Which kind of transmitters appear in FCC-listings and which not?
Are NDBs in the FCC-listings?
Posted by John Davis on August 09, 2005 at 23:02:45.
In Reply to Why are LORAN-C stations not in the FCC-listings? posted by Herbert Smith on August 09, 2005 at 18:15:04.
The FCC does not regulate or license radio facilities that belong to the federal government. Therefore, only non-government stations will normally appear in their lists. Federal radio users are managed by the NTIA and by frequency coordinators for the various branches of the military services. Also, the FAA coordinates with the NTIA and FCC on aviation-related spectrum issues.
John
VLF receiver for trip
Posted by chris waldrup on August 15, 2005 at 14:52:13.
I will be going to the Shenandoah Valley area of Virginia in the next couple of days and would like to take my natural radio receiver along since it will be in an electrically isolated area.
I currently have the McGreevy receiver that I built a few years ago but wanted to get some opinions whether or not a Project Inspire receiver would work better. If so I can build one the next few evenings. Thanks.
Chris Re: VLF receiver for trip
KD4PBJ
Posted by chris waldrup on August 15, 2005 at 14:54:22.
In Reply to VLF receiver for trip posted by chris waldrup on August 15, 2005 at 14:52:13.
I do know that this is not the season for VLF but I thought I would take the radio anyhow. I guess I just would like to know how an Inspire receiver stacks up against a McGreevy.
Chris
JASON - any users on forum?
Posted by Stan on August 17, 2005 at 13:41:19.
I would like to discuss JASON v.99 with anyone currently using.
Anyone have a audio_file.jas for testing ?
Thanks, 73 de Stan AK0b Re: JASON - any users on forum?
Posted by John Andrews on August 17, 2005 at 16:37:06.
In Reply to JASON - any users on forum? posted by Stan on August 17, 2005 at 13:41:19.
Stan,
I'm a regular JASON user, and can provide whatever you want. JASON now has Slow, Normal and Fast speeds, with the option of Turbo on each, for a total of six choices. Any preference?
I'm also planning to put WD2XES in JASON Slow mode this week, maybe tonight. Watch for an announcement on the LWCA LF reflector.
John Andrews, W1TAG/WD2XES
Re: JASON - any users on forum?
Posted by Stan AK0B on August 19, 2005 at 14:07:17.
In Reply to JASON - any users on forum? posted by Stan on August 17, 2005 at 13:41:19.
My interest is v.99 Most of the info I have been able to obtain was from your web page. Software always leads the operating instructions. hi
What I am missing is what JASON speeds are running at the different setting, etc. I am building a HF SSB version of your transmitter for JASON for 80/40 meters.
So I am looking for any details I can find, since I want to run at the fastest possible speed and see what happens under multi-path conditions.
Thanks, Stan AK0B
Re: JASON - any users on forum?
Posted by John Andrews on August 19, 2005 at 20:17:08.
In Reply to Re: JASON - any users on forum? posted by Stan AK0B on August 19, 2005 at 14:07:17.
Stan,
Of the current Jason speeds, I would suggest Fast or Fast/Turbo for HF use. The slower speeds will be pretty taxing for frequency stability with Doppler shifting.
Here is the info that Alberto posted earlier this year, when he came out with Jason 0.98:
------------------------------------------
I have coded a new function in Jason, which was originated by a comment of Bill de Carle, who said that the duration of tones maybe could be shortened, at least when the SNR is good.
The duration was not chosen randomly, it obeys to a physics law, which says that in order to nail down a signal frequency with an uncertainty of df (delta f), you must observe it for a time not shorter that 1/df.
But what Bill said made me think that in conditions of good SNR you could accept a reduced likelihood of a correct identification of the frequency, without increasing the error rate.
So I have introduced the "Turbo" mode, which basically cuts in half the duration of each tone, leaving all of the other parameters unchanged. Some simple audio tests done here (laptop in one room squeaking Jason tones from the speakers, and PC with a microphone in a noisy environment in another
room) gave positive results, at least above a given SNR level.
So now the possible speeds are :
Slow, Turbo OFF Throughput = 18.93 char/hour, 0.315 char/min
Slow, Turbo ON " = 37.86 " 0.631 "
Normal, Turbo OFF " = 151.4 " 2.523 "
Normal, Turbo ON " = 302.8 " 5.047 "
Fast, Turbo OFF " = 1214.2 " 20.24 "
Fast, Turbo ON " = 2422.5 " 40.37 "
The last row is interesting. There are many key-hunting "typists" that are slower than that, so may be the Fast/ON mode could be tried as some sort of RTTY on HF... what are the frequency stability requirements from the rig ? Due to the nature of IFK, a slow drift is of no consequences, provided that the frequency stays in the same FFT bin for the duration of the tone. At the fastest speed, with Turbo ON, the tone duration is abt 0.743 sec, and the bin size is abt. 0.673 Hz. This implies that, e.g. at 14.1 MHz, the frequency must not change more than 38.5 ppm in a 10-minute interval.
This does not look like as a difficult figure to achieve.
-------------------------------------------
John Andrews
Palomar 1750 Meter Transmitter Info.
Posted by Jeffrey W. Card- K1RCH on August 24, 2005 at 14:01:55.
Hi,
I am trying to get some information on a Palomar 1750 Meter Transmitter.
Anything, like the correct crystal needed, schematic, instructions
would be greatly appreciated or a source for the information.
Palomar Engineering no longer makes this transmitter nor do they have any
information in their files.
This appear to have been a kit, its not type accepted.
Thanks,
Jeff Card Hifer FX frequency Change
K1RCH
Posted by Larry WB3ANQ on August 25, 2005 at 06:29:06.
Just got my FX beacon repackaged and cleaned up a bit .... Learned a lot about buffering oscillators, low pass filters, etc ... Should be good to go for a while but am now operating on 13.555115 MHz, QRSS3 "FX" followed by FSK (4 Hz) reversals FSK ... Re: Palomar 1750 Meter Transmitter Info.
Hope to do some reprogramming soon to include a DFCW mode similar to "RY" and a shorter stream of FSK reversals in the QRSS3 mode ...
73's
Bill Farmer
Rockville, MD.
Posted by Ed Phillips on August 25, 2005 at 14:37:16.
In Reply to Palomar 1750 Meter Transmitter Info. posted by Jeffrey W. Card- K1RCH on August 24, 2005 at 14:01:55.
The design was originally mine and I can provide schematics of my version. As far as I was concerned Palomar did a pretty poor job of duplicating it and it became a giant RFI/TVI generator. Differences included an on-board ferrite cored loading coil and omission of any spurious emission protection. Built on an open circuit board instead of a metal chassis with shielding.
Re: Palomar 1750 Meter Transmitter Info.
Posted by Jeffrey W. Card-K1RCH on August 25, 2005 at 23:43:24.
In Reply to Re: Palomar 1750 Meter Transmitter Info. posted by Ed Phillips on August 25, 2005 at 14:37:16.
Ed,
That would be great to have the information, and maybe I can modify the transmitter to clean up the problems.
On Lyle's web site, he has a LF Transmitter for which I have most of the parts, but when I saw this Palomar unit on ebay I had to have it... I am not sure if it was worth the $$ but the variable power supply seemed to be a good feature, the lack of filtering for TVI/RFI could be solved by laying the RF filter cores on their side, and place then on piggyback board mounted on top of the circuit
card or use an outboard assembly.
I was thinking of using the transmitter as a RF source for
testing out the coil/antenna system, the variable power
supply will let me adjust the RF level.
It sounds like you orginal circuit was a lot better and
I would love to have a copy.
Regards,
Jeff
K1RCH
Jeffrey W. Card
18 5TH. AVE. North
Glen Burnie, MD 21061-2016
jwc@Planetb.net 137.5
K1rch/3@Excite.com
Posted by David KR4OW on August 27, 2005 at 21:07:54.
I just stumbled acrossed this. I do not know if it has been posted yet or not.
If so then my apologies. Bill Tippet was nice enough to give me this web site
We might just get it after all (I Hope)
HiFer OH
http://www.fcc.gov/ib/wrc-07/docs/pv/
Check out # 1.15
1.15 to consider a secondary allocation to the
amateur
service in the frequency band 135.7 137.8 kHz;
KR4OW David
Posted by Tom Lau on August 29, 2005 at 20:06:00.
John:
At your convenience, please change listing frequency for HiFer "OH" from 13.5568 mhz to new frequency of 13.5558 mhz. QRSS3 mode only...no square wave.
Thanks, and best regards,
Tom N8TL 177 kHz on DRM
EN81ha
Posted by Obelixx on August 31, 2005 at 04:49:06.
The transmitter Zehlendorf of Deutschlandradio works now (permanently) on DRM.
Re: 137.5
Posted by Eric KD5UWL on August 31, 2005 at 12:44:19.
In Reply to 137.5 posted by David KR4OW on August 27, 2005 at 21:07:54.
So what's the story, guys? Is this significant? Or not time to start counting our chickens yet?
Eric LF Antenna design/fabrication
KD5UWL/WD2XFX
Posted by Ken Ballschmieder on August 31, 2005 at 13:02:03.
I'm interested in finding a source for a low frequency antenna design and Re: 137.5
fabrication. The application for the antenna is for testing tire pressure
sensors that are installed on automobile tires. Communication to the sensor
is by means of a 125 kHz signal (+/- 10%). The sensor is tested under
pressure in a ferrite vessel whose inner diameter is approximately 4" in
diameter. Therefore size restrictions need to be considered as well.
Connection to an external signal source is to be accomplished by an SMA
connector.
Posted by David KR4OW on August 31, 2005 at 21:42:42.
In Reply to Re: 137.5 posted by Eric KD5UWL on August 31, 2005 at 12:44:19.
You know that is a good question being that this group
has 20 times the experience than I I would not begin
to hazard a guess I only just became interested in it shortly ago when someone else on 160M was talking about it
It just make me wonder at all the interesting challenges that would be presented by going on this band.
David
potrzebie
