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RSGB
GB2RS News Team | September 12, 2025
As of Thursday 11 September, it looked like someone had thrown a switch on the Sun to turn off all new sunspots! Unless there is a big change, there will be no sunspots visible on the Sun’s surface today, the 14 September.
It is clear that we are no longer at solar maximum.
A bigger problem is a large coronal hole on the Sun’s surface, which is rotating to be Earth-facing. It is on the Sun’s equator so is ideally placed for maximum disruption to the Earth. A high-speed solar wind stream should reach Earth by the 14 September, and geomagnetic storming may be possible at higher latitudes. Expect maximum usable frequencies, or MUFs, to drop and trans-polar paths to be affected once the Kp index rises.
HF is now starting to improve as we head towards mid-September. By 1000UTC Propquest shows that the MUF over a 3,000km path can be as high as 31MHz, as long as the Kp index stays low. This should continue to improve as we head into October.
The best DX last week continued to be T30TTT in Western Kiribati, this time on the 40 and 17m bands using FT8. 9J2FI in Zambia also put in an appearance on the 17m band using FT8. TZ4AM in Mali was spotted on the 15m band using SSB. For Morse enthusiasts, HC5AI in Ecuador was working on the 15m band using CW, according to the CDXC Slack chat group.
NOAA predicts that the solar flux index will start the coming week at 125 but then gradually improve to reach 145 by the end of the week. As mentioned earlier, the Kp index is set to reach 4 or 5 between the 14 and 16 September due to the coronal hole.
VHF and up :
The present spell of unsettled weather is likely to remain the main driver of weather-related propagation modes for the next week. Low-pressure systems are following the jet stream across the Atlantic and over the UK, which is a typical track for this time of the year. This means that we should expect to experience the odd example of rain scatter for the GHz operators, and occasional strong winds will start to test that we have our antennas in good order after the quieter weather during the summer.
This is not to say that there won’t be any Tropo but we will have to look for it carefully. In a mobile weather pattern such as this, the periods of high pressure tend to act as separators between the lows and, as a result, they usually move with similar speed. This makes them short-lived and thus not particularly good at establishing strong inversions for Tropo. There are two low-grade possibilities. One is around Tuesday 16 September as a weak transient ridge moves across the country. The second will be as another weak ridge moves across on Friday 19 September.
The meteor scatter situation is still pretty much in a random activity state, although there was a minor shower of the Epsilon Perseids, which peaked on the 9 September and may have a few left in the tail-off. However, in general, it’s more realistic to assume we’re dealing with random activity. Aurora, on the other hand, has been putting in an appearance lately, so keep watching the Kp index for values climbing above 5.
Now for an update on EME. Today, the 14 September, marks the Moon’s maximum declination – its highest point in the sky. Perigee, when the Moon is at its closest point to Earth, was passed on 9 September, so path losses are increasing. Sky noise is low and will remain so until the 20 to 22September when the new Moon is very close to the Sun.
https://rsgb.org/main/blog/news/gb2rs/propagation-news/2025/09/12/propagation-news-14-september-2025/
(Mike Terry/BDXC)
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| HCJB Studio QSL |
In 1941, live programs were added in Russian,
Swedish and Quechua, the predominant indigenous language of the Andes. The frequencies in use at this time were 6050,
9745, 11775 and 15155 kHz. By 1944, the
station had aired programming in 14 languages including live programs in Czech,
Dutch, French and German. Programs in
languages such as Arabic, Italian and Hebrew were recorded elsewhere and sent
to Quito on large acetate-coated aluminum transcription discs.
In 1951 HCJB acquired 45 acres of land near the town of Pifo, 20 miles east of Quito, where they constructed transmission and antenna facilities that enabled considerable expansion over the following decades. Initially, eight curtain antennas and two dipoles were erected, and all broadcast activities were moved to the Pifo site in 1953, with two studio-to-transmitter links operating on FM. Broadcasts in German were expanded, not targeting Europe, but rather the many post-war German-speaking communities in South America. HCJB’s first ‘high-power’ shortwave transmitter, a 50 kW unit, was again designed and built in-house in 1956. Here’s a recording of HCJB from 1957:
Then in 1961, HCJB launched
a TV station for Quito - the first licensed TV station in Ecuador. And in 1965, HCJB’s own hydro-electric plant
at Papallacta began generating sufficient electricity to power all the
broadcasts from Pifo. Pre-recorded ‘Voice
of the Andes’ radio programs in Central European languages began to be aired,
and more live programming in Portuguese and Japanese was added in 1967.
Also in 1967, three
100 kW RCA transmitters were acquired from Vatican Radio, and these were placed
into service progressively between 1968 and 1970. HCJB was then receiving hundreds of letters
each week with reception reports from shortwave DXers around the world. The
correspondence department of HCJB responded to its listeners with QSL cards and
Christian tracts.
photo via Radio Heritage
One fondly remembered program was "DX-Partyline", which was hosted from its inception by HCJB missionary Clayton Howard and his wife, Helen. The program was heard for more than 40 years, twice a week, and included the reading of letters from shortwave listeners around the world as well as reception reports sent to the station. "DX-Partyline" also included shortwave radio listening tips, information on antennas, and equipment reviews. In 1974, Clayton Howard suggested a shortwave listeners' club be created, and so ‘Andes DXers International’, (or "ANDEX") began. Members would receive a membership certificate and membership card with the member's name and individual member number, along with Howard's signature. A monthly bulletin was sent to members, of which I was one. In fact, I was one of HCJB’s monitors in the UK, sending them many dozens of reception reports over the years, and I still have an HCJB pennant hanging in my studio. ANDEX eventually had a membership in the thousands and continued as a service of HCJB until 1996.
Besides DX-Partyline, other original radio programming produced by HCJB staff members included "Morning in the Mountains," "Musica del Ecuador," "Musical Mailbag," "Happiness Is," and “Passport”.
In the mid-1970s, HCJB constructed a
secondary transmitter site halfway up Mount Pichincha, the volcano in whose
foothills Quito is built. There, they
installed a 50 kW medium wave transmitter, operating on 690 kHz. On Sunday nights they often ran DX tests, such
as this one:
In 1979, a steerable ‘egg
beater’ antenna was constructed, and in 1981 a 500 kW transmitter, designed by HCJB’s
own engineers, was built at the facilities of Crown International in Elkhart,
Indiana.
Then in the 1990’s, HCJB
engineers built a number of new 100 kW transmitters using the HC-100 design, which
also used operation on SSB with a carrier.
These transmitters were the ministry’s contribution to the “World by
2000” challenge, and they were of a successful design that was deployed not
only in Pifo, but also at TWR in Swaziland and later at Reach Beyond in
Australia. Here’s an Id from June 1994:
Over the years, more
land was bought adjoining the Pifo site, such that it eventually covered more
than 200 acres. By 1995,
there were 13 transmitters and 32 antennas on the Pifo site, beaming to all
corners of the globe. The main studio
compound was in downtown Quito, from where programming was fed to the
transmitter site via a microwave link which replaced the earlier FM links.
A staff of over 100 people was employed in
the radio ministry, and nearly double that were involved in the operation of
HCJB’s medical clinics throughout the country.
The eventual closedown of HCJB from Quito came not because of falling listenership or loss of commitment to shortwave broadcasting, but rather because of the decision of the Ecuadorian government to demand the removal of HCJB's shortwave antenna masts, which they determined would be too close to the new Quito airport then under construction. Consideration was given to building a new shortwave station near Guayaquil, but in the end, the mission leadership in the USA decided instead to move their base of operations from Ecuador to Australia.
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| HCJB QSL via Teak Publishing Archives |
The station at Pifo near Quito was gradually shut down and dismantled in the mid-2000’s, and their final broadcast in English was on Saturday May 6, 2006, and on Sunday, September 30, 2009, after nearly 80 years of international shortwave broadcasting from Ecuador, radio station HCJB made its last high-power transmission. The 50 kW medium wave transmitter on 690 kHz was shut down in 2017, but the station does continue to this day from the Mount Pichincha site, with Spanish and Quechua on 6050 kHz, using a 1 kW transmitter and a double-dipole antenna designed to reach the remote rural areas of Ecuador.
Back to you, Jeff.
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| Photo via Space.Com |
