Posts Tagged ‘moonbounce’
Thursday’s Moonrise
I couldn't hold out any longer! The sight of a full-moon rising over the ocean a few nights ago was just too difficult to resist ... I would have to spark-up my 2m mini moonbounce system and see what was happening.
The QSLs are now all in from my last eme adventures in the early summer, bringing my total number of contacts to 80.
RW1AY used an 8 x 15el cross-polarized array |
EA4CQ's 4 x 9el DK4ZB yagis |
YU7AA's 8 x 13el nested array |
NC2V used a 4 x 20el cross-polarized array |
VE1KG's 4 x 17el yagi array |
DK5SO used four 20' long yagis and 750W |
My simple system uses a single 9el m2 yagi and an old third-hand 140W brick amplifier and built-in GaAsFET preamp. The yagi is mounted atop my 50' tower and fed with about 100' of RG-213 cable, along with its 2+ db of loss.
Looking directly out over the saltwater of Georgia Strait seems to provide the near theoretical 'sea-gain' of 6db, making the little yagi behave more like a box of four in terms of gain. As well, there are no noise sources when pointing out over the water at the rising moon. Not being able to elevate the antenna means 'moonrises' only, and usually gives me about 90 minutes per session before the moon gets too high.
Last night was surprisingly active, mostly with U.S. stations, as it was still early evening here but there were also several early-rising Europeans on the band.
One outstanding signal was from a station I had not worked before, OK1DIG, who was running a 4 x 15 element yagi array. I called him a few times when his signal was easily audible (-15db) but he seemed to only hear me later, replying to one of my 'CQ's, with his signal starting to drop here. This is often the case on 2m eme as a reciprocal two-way path is not always the rule. He was my only contact of the evening (#81) but also heard were K9SLQ, UT3MD, PA3FYC, all of whom I have yet to work.
OK1DIG's audible JT65B CQs |
Thursday’s Moonrise
I couldn't hold out any longer! The sight of a full-moon rising over the ocean a few nights ago was just too difficult to resist ... I would have to spark-up my 2m mini moonbounce system and see what was happening.
The QSLs are now all in from my last eme adventures in the early summer, bringing my total number of contacts to 80.
RW1AY used an 8 x 15el cross-polarized array |
EA4CQ's 4 x 9el DK4ZB yagis |
YU7AA's 8 x 13el nested array |
NC2V used a 4 x 20el cross-polarized array |
VE1KG's 4 x 17el yagi array |
DK5SO used four 20' long yagis and 750W |
My simple system uses a single 9el m2 yagi and an old third-hand 140W brick amplifier and built-in GaAsFET preamp. The yagi is mounted atop my 50' tower and fed with about 100' of RG-213 cable, along with its 2+ db of loss.
Looking directly out over the saltwater of Georgia Strait seems to provide the near theoretical 'sea-gain' of 6db, making the little yagi behave more like a box of four in terms of gain. As well, there are no noise sources when pointing out over the water at the rising moon. Not being able to elevate the antenna means 'moonrises' only, and usually gives me about 90 minutes per session before the moon gets too high.
Last night was surprisingly active, mostly with U.S. stations, as it was still early evening here but there were also several early-rising Europeans on the band.
One outstanding signal was from a station I had not worked before, OK1DIG, who was running a 4 x 15 element yagi array. I called him a few times when his signal was easily audible (-15db) but he seemed to only hear me later, replying to one of my 'CQ's, with his signal starting to drop here. This is often the case on 2m eme as a reciprocal two-way path is not always the rule. He was my only contact of the evening (#81) but also heard were K9SLQ, UT3MD, PA3FYC, all of whom I have yet to work.
OK1DIG's audible JT65B CQs |
6m Awakens
As is often the case between here and KE7V, signals from Europe often move quickly northward and sure enough, about two minutes later, EA8DBM's CW signal appeared at good strength, calling CQ.
I quickly worked Alex, whose signal stayed around for almost an hour, and then began looking for any others that might be riding along on the same path. Sure enough, his neighbour, EA8TL was heard CQ'ing, but much weaker. After a few calls he came back with my report to which I responded several times, but it was evident that he was having difficulty as he kept repeating my report. Unfortunately, and unlike Alex, he soon faded away without me ever hearing the needed 'RR' for my signal report confirmation.
About an hour later, a rapidly fading and quickly building signal was heard on CW calling CQ at about 25wpm ... it was CN8KD in Rabat, Morocco!
courtesy: https://www.google.ca/maps/ |
I called Mohamed several times as his signal built, but his rapid-fire CQ's continued much to my frustration. As his signal peaked to a solid 569, he sent a '?' and then replied with 'VE6?', probably as shocked as I was. After repeating my call several times, he returned once again but this time with 'VE7NL?'. The next several transmissions from him were the same and as the delicate links between our two stations shifted once again, he was gone as quickly as he'd arrived ... close, but no cigar. This was the first 6m signal that I've ever heard from continental Africa since coming on the band in 1970. I wonder if I will ever hear him again.
With a dead 6m band on Saturday morning, I was able to get back on EME (JT65B mode) for my final day of favorable moonrise windows and had a nice surprise when VE1KG in Nova Scotia answered my first CQ, for initial #81 with my small station ...
... all-in-all, a pretty fun week on the VHF's!
June’s EME Moonrise Window
With the QSL's from spring's EME activity gradually showing up in the mail, June's EME moonrise action should keep the postman busy next month as well.
Dmitrij - UA3PTW - Initial #60 |
Vlad - RZ3BA/1 - Initial #61 |
Oleg, UX5UL - Initial #72 |
Val - UT6UG - Initial #73 ...both Oleg & Val are in the same city |
Jorg - DK3WG - Initial #74 |
Bernie - ZS4TX - Initial #75 |
I have about five days of favorable moonrises directly over the ocean in front of my antenna (9el m2 Yagi), and a couple of hours each day before the moon gets too high for my antenna as it lacks any elevation control. After five days the moonrises usually move too far to the south and I am pointing into too many RF-absorbing Douglas Firs on my neighbor's property.
I started on Tuesday morning, which according the EME data graph shown below, should have been the best of the week since the moon was as close as it would get and the skynoise was low but unexpectedly, no signals at all were heard!
courtesy: http://www.mmmonvhf.de/eme.php |
On Wednesday, things should not have been as favorable since the moon was another 5000 miles further away, but the magic of radio did not disappoint ... my first CQ, with the moon barely 1 degree high, brought something that has never occurred here before ... three replies!
I soon completed three new initials with my QRP (140 watts) station ... RW1AY (# 76 ), DK3BU (#77 ) and DK5SO (#78 ). I have no idea why Tuesday was so poor or why Wednesday was so good, but I'll take it.
Today's conditions were also good again, with my first CQ being answered by N2CV in Florida, for #79.
Barry - NC2V - Initial #79 4 x 20 el array |
About an hour later, the strong CQ of YU7AA was heard who responded to my first call. After that his signal faded for some time and eventually returned to speaker quality level and the contact was completed for #80 ... I keep wondering if or when I'll run out of stations large enough to work.
Jozef - YU7AA - Initial #80 |
Who knows what tomorrow will bring, but as the moon climbs further away and rises further to the south, working anyone will be a nice surprise. I've usually avoided summer EME work, as often the best moonrises are very close to the sunrise, making it difficult for bigger stations to hear me when pointing near the sun. After June's good luck, it seems that summers might require more attention ... the next few months might be more interesting than I had thought.
QSL Bounty
Four of the cards were for recent 2m EME contacts ...
... and one was for 160m, confirming a winter CW QSO with Haiti, bringing my 160m DXCC total to 158 confirmed.
I have always loved QSL's, and looking back, the whole concept of collecting these small treasures was one of the things that initially attracted me to the radio world, when reading a magazine article about shortwave listening and collecting QSL's. I'm not so sure I love the QSL bureau though, but that's a whole other topic ...
March’s QRP EME Window
Lunar declination track for March courtesy: http://www.moontracks.com/moon-declinations.html |
My minimal system (single 9el Yagi and 140w) makes it very easy to see the day to day changes in EME conditions due to various causes such as local geomagnetic conditions, Faraday rotation and libration fading ... or combinations of each! One of the days was particularly good, with numerous signals heard throughout the session while the next day was just the opposite, with only a few very weak signals and no contacts. On that particular day, I was being heard well by several European stations but was unable to hear any of them ... a true 'one-way' path and not uncommon on EME.
My small EME station. Note old microwave oven blower on the 'brick' amplifier. |
Several smaller 4-Yagi stations were worked during the week, re-enforcing the benefits of having a moonrise over the ocean. As mentioned previously, the extra 6db of horizon gain allows my single 9el Yagi to perform more like a stack of four 9el Yagis. One of the fellows that I worked, DK5EW in Germany, asked if there was anything 'special' about my location that would make my very small station sound so strong at his end ... the ocean is clearly doing its job!
Altogether, 12 new stations were worked during March's window, bringing my total to 70 "initials". From the looks of the amount of activity, there are still many stations yet to work, that should be within range of my system.
Stations worked this week were:
I2FAK, UA3PTW, RZ3BA/1, SK5AA, PA2CHR, ES3RF, YO3JR, PA5Y, DK5EW, SM7GVF, EA4CYQ and W5ZN.
Three of these stations were using relatively compact antenna systems, consisting of 4x8el or 4x9el arrays, while the rest were larger. I have yet to tally up my DXCC or states total on 2m, but I know that W5ZN, in Arkansas, was a new state.
Up until this past week, the highest moon elevation that I have completed a QSO was with the moon at 18 degrees above the horizon. This week it was extended, at what is probably the limit of my fixed antenna, to 19.6 degrees when working ES3RF. At the other end of the scale, IK2FAK was worked with the moon at only .87 degrees high!
This month also provided my first glimpse of a 2m DX 'pileup', when J8/WW2DX in the Grenadine Islands showed up, calling CQ via the moon. My screen shot below shows at least 12 different stations calling him during his one-minute listening period ... some not yet 'warmed-up' as seen by their drifting oscillators.With several of the signals audible, it was an amazing thing to observe.
2m pile up on J8/WW2DX |
The 4 x 8 el cross-polarized array of PA5Y |
YO8JR sending his 'RR' followed by '73' |
LHS Episode #052: Amateur Fantasies
Hello, podcast listeners! It has been an extra week that you've had to wait for our landmark episode 50 to be released. I (Russ) had planned to do an episode from his hotel room in San Jose. Unfortunately, the network there was so bad it was impossible to record so everything was pushed back.
In this episode, we talk about life, love and amateur radio. OK, not really. But we touch on a number of interesting topics including the necessity of logging in amateur radio, theoretical nonsense like Internet via Moonbounce and, thanks to a couple of missives from AD7MI, we wax philosophical on our ideal ham shacks--computers running Linux included of course.
Thank you for being a listener of our show. If you're new: Welcome! Please tell everyone you know where they can find us. And keep fighting the good fight.
73 de The LHS Guys