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Messages - Ed H

Pages: 1 2 3 4 5 6 7 [8] 9
106
22 Meter Band HiFER Beacons / Re: loaded bases tonight
« on: October 13, 2017, 2327 UTC »
Limited listening here but last weekend AZ faded up to a good loud signal for a few minutes ~ 4pm local time (~1100Z)

First logging of this reliable catch for a long time. Let's hope for improving conditions.

PVC is still operational with the same 1/2 wave sloping dipole on the house roof. Walking checks indicate the same readability signals at ~ 1 mile distant.

107
22 Meter Band HiFER Beacons / Re: Poor conditions, interference
« on: August 29, 2017, 2328 UTC »
I think most of the problem is conditions. Interference is sporadic enough in nature here that beacons have a chance if one is patient. I've had rather little time to listen of late, so have not been following any trends in propagation. This weekend should allow some time for radio.

Also need to do some aerial checks on PVC - preventative maintenance etc.

108
22 Meter Band HiFER Beacons / Re: PCO new id
« on: August 07, 2017, 2149 UTC »
Good news tesla.

I tried listening this weekend, but conditions and interference were not conducive.

109
22 Meter Band HiFER Beacons / Re: Poor conditions, interference
« on: August 07, 2017, 2144 UTC »
My Bad.... this signal is CODAR.

Which means at times I have another more rapid "buzzer" like interference which is something else.

110
22 Meter Band HiFER Beacons / Poor conditions, interference
« on: August 07, 2017, 2140 UTC »
Hi Folks,

Monitoring this past 5th 6th August, showed very weak conditions. A feint spectrogram trace of signals in the 13,555.xxx mini band, not readable.

Often I am getting a rapid repeating swept signal. It passes through the 22m band perhaps 2x per sec, and has a swept range of at least 100 kHz. Signal strength is up to S7 at times, but has characteristics suggesting it is reaching me as a skywave. Any ideas? This emission precludes any weak signal work, as one might imagine. It isnt CODAR as we get that too sometimes.

Cheers,

Ed

111
22 Meter Band HiFER Beacons / Re: GNK and K6FRC
« on: July 25, 2017, 2048 UTC »
July 22 and 23, ~6pm PST Caught a few signals on Spectrogram in the 13,555.xxx zone, including NC and possibly EH. On the 23rd also GNK further up the band. No sign of any closer stations.

Setup was with random dipole and Lowe HF225 receiver.

112
22 Meter Band HiFER Beacons / Re: Some unknown quanties
« on: May 31, 2017, 2119 UTC »
Interesting Tesla, I have heard similar signals before. Semi regular "chirpy" tones?

Ed

113
22 Meter Band HiFER Beacons / Re: PVC loop aerial experiments.
« on: May 31, 2017, 2117 UTC »
I have persistent signals in the 13,560 to 13,562 range, that I think comes along with the cable TV lines or other utilities. Wandering locally with a portable radio suggests a large number of things using the 22 m  ISM band, radiating intentionally or unintentionally over short ranges, usually within a quarter mile.

PVC is back on it's rooftop 1/4 wave dipole for the time being. I will retune the loop and reconnect again soon. Updates in this thread.

Cheers

Ed

114
22 Meter Band HiFER Beacons / Re: FL beacon 13555.520 KHz CW
« on: May 27, 2017, 1450 UTC »
Thanks Dag...

I realised it must be you shortly after posting. Hopefully will get some listening time soon.

NC reaches California regularly, I am sure FL has a chance.

Best regards,

Ed

115
22 Meter Band HiFER Beacons / Re: FL beacon 13555.520 KHz CW
« on: May 26, 2017, 1817 UTC »
Thanks for the info Dag. Nice to see another beacon pop up - I'll listen out.

Do also check the HiFER page at LWCA.org as there are several members that listen and would have a good chance of catching your FL.

FYI there is another operator listed on 13,555.465 kHz using FL.

Cheers

Ed

116
22 Meter Band HiFER Beacons / Re: PVC loop aerial experiments.
« on: May 26, 2017, 1812 UTC »
Thanks for keeping an ear on it! I may need to retune the loop. PVC is back on the dipole until I can attend to matters.

I do want to spend more time using it for listening as well. It is excellent, especially considering it's size!

117
22 Meter Band HiFER Beacons / PVC loop aerial experiments.
« on: May 17, 2017, 1846 UTC »
Introduction:
I have been doing some tinkering with loop aerials lately. The present example is approximately 12 ft of #12 solid wire on a square frame of white PVC pipe. Some experimentation a receiver noise bridge enabled a coupling loop to be configured so that a 50 ohm impedance is presented to the coax. A ceramic bodied 15-150 pF trimmer at the top of the loop permits tuning from ~6 MHz to ~15 MHz and is the only purchase made specifically for the project. For the latest experiments, the loop was suspended from a tree, borrowing the feeder for my long-wire. This disposition is somewhat close to the house, and not especially "out in the clear", but does allow the loop tuning to be trimmed, which is quite demanding on account of the sharp peak, and the need to use a long trimmer tool so as to minimise one's influence on the loop due to stray capacitance. The loop was tuned in situ, on transmit, using a small portable receiver to detect peak output.

Experiment 1: Receive
In this endeavour, I compared the loop against the "random wire dipole" that has become the de facto standard for 22m HiFER reception. Firstly, I noticed a higher (atmospheric) noise floor against the dipole. Not much man made "hash" that I could identify. Attention turned to the cluster of signals around 13,555.+++ kHz (though I did try the top and bottom of the bands as always). The dipole showed some activity from both SIW stations, and IIRC WM. See the http://lwca.org/sitepage/part15/index.htm website for details. Switching to the loop brought traces that were obviously a continuation, but would be hard to have logged without the previous observations.

Intermission:
I decided to experiment with feeding PVC's signal to the loop, to compare the received signal at the receive dipole with the numbers I see from PVC's usual (separate) dipole. I'd played before (indoors) and seen S9 +30 dB, now, curiously, the signal was swinging (hint) from barely S9 to S9 +20 dB. Then I realised the swing had a fairly consistent period/time constant. I visited the loop and saw the issue immediately. With a little stabilisation (another piece of string) I arrested the twisting motion. Also, I arranged the loop so that in theory, it's pattern should match the direction of the dipole. Result: S9 +30 dB and steady, very similar to the dipole.

Return to receive:

The re-oriented loop showed improved sensitivity to the HiFERs that could also be seen with the dipole. It would be instructive to monitor both simultaneously, as an A/B comparison is at the mercy of the short timescale variations in propagation. However, the loop's performance is very encouraging, especially considering its compact size. It might be expected that better results could be obtained with improved siting. The dipole against which the comparison took place has it's apex in a tree at ~20 ft and the ends > 6 ft above ground. By contrast the loop center was perhaps 6 ft above ground, but further down the hill, and potentially affected by other nearby structures - quite a disadvantaged site in my opinion.

This work provides anecdotal evidence to support the enthusiasm for tuned loops that I have seen from a significant number of credible internet sources. Attention to a few details appears to show that these aerials are suitable for aspects of HiFER work. One aspect that has not been addressed is the desire/requirement to adjust tuning remotely for easy optimisation, and convenient use on a wider range of frequencies. This is under consideration at present.

PVC is transmitting from the loop this week, so reports from 13,558.400 would be very welcome.

Regards,

Ed

118
22 Meter Band HiFER Beacons / Re: PCO new id
« on: May 17, 2017, 1839 UTC »
Thought I heard GNK briefly this Sunday, but nothing I could confirm.

The visual receive signals near 13,555.xxx were coming in but very weak. I had fun A/B testing a loop antenna on receive with these signals. Comparison was against my "random" dipole. Still it is more fun to hear things.


Ed

119
22 Meter Band HiFER Beacons / Re: PCO new id
« on: May 13, 2017, 0702 UTC »
Hi Tesla,

listening when I can. Your signal makes it to CA many times when conditions allow.

cheers

Ed

120
Thanks Tesla!

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