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 permissable 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 - Ed H

Pages: 1 [2] 3 4 5 6 7 8 9
16
HF Beacons / Re: Coastal Slider Back On 4109.5
« on: July 18, 2022, 0420 UTC »
Receiving the Coastal Slider here on the SF Peninsula with no difficulty this evening. S3 to S5.

17
HF Beacons / Re: New whooper beacon on 4095.65
« on: July 18, 2022, 0412 UTC »
Jum[img in a bit late, but I just started looking for Beacons outsides 33 m. The DW signal is very readable here in Northern California after dark, S3  S5, equal to the noise. Antenna is an 80 ft random wire with transformer isolated feeder back to various radios. The higher frequency "desert slider", 4108 kHz is also easy copy, similar strenghts.

Ed

18
I like that.

A transmitter is possible, bringing us the low power pyrite pirate.

Negative resistance oscillator: http://www.sparkbangbuzz.com/els/iposc-el.htm

19
22 Meter Band HiFER Beacons / Re: hifer SIW in slant mode
« on: June 21, 2022, 1948 UTC »
Good Catch Ray!

20
22 Meter Band HiFER Beacons / Midnight Hifers
« on: May 25, 2022, 1615 UTC »
I've been allowing my receive setup to run overnight at weekends, with some interesting results seen, on occasion, through the night. More details are available, along with screenshots, over at LWCA.

It's not uncommon at the moment to see longer path HiFERs here at my NorCal QTH late into the evening and sometimes into the early hours.

21
22 Meter Band HiFER Beacons / HiFER Screenshots from 10 April 2022
« on: April 12, 2022, 2316 UTC »
Reception improved markedly in the (local) afternoon and evening of 10 April here in Northern California. Screenshots (and WSJT) captured several HiFERs:

Those can be seen over at LWCA.org: https://www.lwca.net/mb/msg/12547.htm

22
22 Meter Band HiFER Beacons / PCO, W8AC, 7P
« on: April 05, 2022, 0030 UTC »
Heard yesterday (April 3rd, ~ 1400 PDT) in Northern California

PCO - Audible sometimes good readability between fades

7P - Well above the noise for long periods.

W8AC - several WSPR decodes during late afternoon local time. A new logging at this location.

23
Equipment / Re: Common mode noise
« on: April 01, 2022, 1929 UTC »
I realise the conversation is a month+ old, but one thing that has really worked for my (receive) antennas is the use of a transformer balun. In this way, there is a very good barrier to common mode signals. The method was inspired by reading W8JI's website, particularly in relation to connection to beverages. However, the approach has worked nicely with a dipole, and an 80ft random wire, both connected with coax.

One can demonstrate the common mode noise that would result without these simple transformers, just by touching the receiver's antenna input to the braid of the coax. In normal use, no or very little conducted noise is experience throughout most of the HF range. For LF work (500 kHz and below), I have another transformer that can be placed in-line, which provides an audible benefit in increased CM isolation e.g. for 136 kHz (2200m) beacon reception. It really helps tame the household noise from switch mode PSUs.

Ed

24
Utility / 1680 kHz UK and Europe. Stanag or other mode?
« on: March 30, 2022, 2218 UTC »
Hi Folks,

While visiting the UK, I was doing a little listening in the Marine MF band above 1600 kHz. Superimposed on the Floro (Norway) station USB weather reports on 1680 kHz was a systematic buzzing, audible after dark only.

Checking Sigidwiki for comparson of the audio suggested that this may be a Stanag variant of some kind similar in sound to Stanag 4285 , but I can't swear it is identical. Almost any SDR based in the UK or Northern Europe seems to pick it up.   https://www.sigidwiki.com/wiki/STANAG_4285

Can anyone shed more light here? Extensive searching has turned up nothing at all.

Thanks

Ed

25
22 Meter Band HiFER Beacons / High power signals in 22m 6 March 22
« on: March 08, 2022, 1855 UTC »
Hi Folks,

I was wondering if any other 22m listeners heard the strong signal data transmissions on 6th March (Afternoon hours, PST)? This appeared to start with a single tone, ahead of a fast rate transmission with wide bandwidth (500 Hz or more) roughly centered around 13,555.40 kHz. It continued for many minutes, possibly longer, as I did not monitor the receiver continuously, although I should have screenshots that can be reviewed to help time-stamp the entire event.

The signal had the character of a powerful transmission at considerable distance, judging by the slight fading and other characteristics suggesting skywave propagation.

Ed

26
22 Meter Band HiFER Beacons / Re: TSN
« on: December 08, 2021, 2015 UTC »
TSN has been heard regularly over the last few weeks during weekend monitoring here at PVC. (SF Peninsula). It is frequently strong enough to be easy copy by ear.

27
22 Meter Band HiFER Beacons / Re: FJB
« on: December 06, 2021, 2310 UTC »
FJB was copied by ear on Dec 4th, on the S.F. Peninsula. Good clear signal, just above the noise

28
Equipment / Re: Can a common mode choke really help reduce RFI?
« on: December 02, 2021, 1843 UTC »
Nice illustration of the improvement Chris.

In tinkering around with reception of LowFER beacons and 630 m activity, I have found similar measures very helpful. The outdoor long-wire is transformer coupled at the feed-point, which also has a ground rod. Only the antenna side winding of the transformer is connected to the rod. The winding connected to the coax is "floating"

At the receiver end, I have another isolating transformer that can be inserted into the feeder. Not exactly a CM choke as such, but the intention is the same, add a high impedance for common modes. It seems to help a lot.

Touching the shield of the incoming coax to the centre conductor of the radio provides a very convincing demonstration that these measures are effective.

Ed

29
Equipment / Re: BELKA DX
« on: August 17, 2021, 1803 UTC »
Interesting results, thanks for sharing. I've had no opportunity for testing (distracted by other projects) but will follow up. One requirement is a stereo mic or line input to the PC - I don't have anything to hand yet.

30
22 Meter Band HiFER Beacons / August 15th WSPR
« on: August 17, 2021, 1758 UTC »
Here in Northern California, WSPR signals from EDJ, SIW and SZX were recorded during 22m monitoring, daylight hours, 15th August. Other Beacons noted were 7P, EH and NC from traces recorded in Spectrum Lab. EH is occasionally audible here, as is 7P.

Receiving with random wire dipole and Icom IC R-72

Pages: 1 [2] 3 4 5 6 7 8 9
HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns