KP4AO

 


01.05.2010

I've now found time to go through the 22 audio files we saved when using JT65B at KP4AO. As a reminder, here's what it looked like on our screen with WSJT set to its widest passband, about 4 kHz: http://www.physics.princeton.edu/pulsar/K1JT/KP4AO_JT65B_1.png Going though these files carefully, one at a time, I decoded the following 63 stations calling KP4AO. Completed QSOs are marked *. Most stations were copied multiple times. 

 

9A9T AE6EQ AF6O* CT1FFU DF3RL DF6SM* DH1WM DH4FAJ DJ8MS DL5RDI EA2ASB EA3XU EA4CYQ* EB3DYS ES3RF* G4ZFJ* G6HKS G8FJG HA0HO HB9DKM HB9DRI IK1FJI IK7EZN IV3CYT K3GAU K5LA K6HLH K8SIX KI7JA KR7O KU7Z LU1C NA6MF N9XG* OE3SJA OM3BC OY4TN OZ1MAX OZ2LD PA3CMC PA3DOL PY2BS RN3QRY S51WX* SK4AO SM4LMV SP1JPQ SP3XBO SQ7DQX SV2DCD* SV2RM* UA4FRL* UT5JCW W1FKF W1ICW* W7EME W7ID W8PAT W9GA WB2RVX WD4JHD WF1F* YL2HA YL2OK* YL3HA* YO5PLD YU1EXY

 

These stations were found between about 432.045 and .049, where we announced we would be lietening. Many more stations were calling outside this frequency range, especially in the range 432.050 to .060, our listening range for SSB and CW. Here's a copy of the Linrad screen when listening to one of our wideband recordings: http://www.physics.princeton.edu/pulsar/K1JT/KP4AO_Linrad.png The scale at top is frequency in Hz above 432.000 MHz. Dark horizontal strips in the upper waterfall show the KP4AO transmissions; bright spots at about 44000 Hz after these are the KP4AO echo. Most stations calling us are between 432.050 and 432.060, as requested. The very strong JT65 station at 432.064 is working someone else. I've not yet listened gone through our wideband recordings to attempt making a list of all callsigns heard on SSB and CW. My partial list continues to grow, however; it now contains 202 callsigns (CW only); here's the list:

 

9A1CAL 9A1CAW 9A1CMS 9A5AA 9A5SG 9A9T 9H1BT AA5TB AE6EQ AF1T AF6RF CT1DMK DF0MU DF1HF DF1VB DF3RL DG8YHH DG9BEW DG9YIH DJ1RPL DJ2QV DJ5BV DJ6JJ DJ8MS DK2ZF DK5MB DK6AS DK7AN DK9TF DL2HWA DL3HXS DL4HRM DL5MAE DL5RDI DL6SH DL7FF DL8GAP DL9JY E73O EB3DYS F2CT F5SE/P F6BCU F6FHP F8GBY F6KIF G3LQR G4ALH G4CCH G4CEN G4NOK G4YTL GM4ISM GM4JJJ GW8IZR HB9BZA I1NDP I2FHW IK1HWG IK6EIW K0TV K1DM K1DS K1DY K1NY K2TXB K4RT K4RTS K5DOG K6AAW K6TSK K7NT K7XC K7XQ K7XQ KA9A KB8U KE7L KH7Y KL7HFQ LA0BY LU1C LU7DZ LZ1DX LZ1DP LZ1OA N0OY N1VT N2NQI N4AO N4FRE N4GJV N4SCS N6DIQ N6DIT N8OL NA6MF NU6S OE2CAL OE2WPO OE2XRM OH2PO OH3A OH3HLJ OH4LA OH6NVQ OK1DST OK1KIR OK1KPA OK1TDO OK1VVT OK1YK OK1ZHS OK2GMO OK2JCZ OK2JNM OK2KJT OK2KOG OK2KVM OK2NMA OK2PMS OK2TT OK2UYZ OK2VSO OK2VWX OK2ZI OM1GX OM1TL OM3LQ OM5CM OM5LD ON5OF OZ1BCG OZ5W PA2CHR PA3DOL PA3DZL RA3XX RW6AG S51ZO S53RM S56X S57M SF6X SM3MQU SM4IVE SM6CEN SM7GEP SM7SJR SP3YDE SP6ITF UN8L UR6IWZ UT2EG UT5CW UT5JCW VE2DFO VE2JWH VE3KRP VE4MA W1FKF W1JR W1KSZ W1MKY W2CNS W2WD W3EP W3KWH W3SZ W4DEX W4RBO W4XP W4ZRZ W6AT W6FM W6YFK W7CS W7IUV W7IY W7MEM W7OE W8TXT WA1ZMS WA2ODO WA3DRC WA3GFZ WA3XX WA9KRT WB2SIH WB6JZY WB7QBS WD5AGO WW1M YL2HA YL2OK YO2BCT YO2IS YO2KDT YO2LAM YO2LCP YO7IV YT2RA YT5MW 

 

There are surely some mistakes or typos here. A total of 106 SSB QSOs, 122 CW QSOs, and 14 JT65B QSOs are in our log. You can check to see if your call is in the log by going to http://dx.qsl.net/logs/logs.html QSL information is also posted there. Once again, thanks to all who sent us reports on this most enjoyable event! We're sorry we could not work you all in the time available!

 

-- 73, Joe, K1JT

 


23.04.2010

 

For a good laugh, you might want to see what we were confronted with when we switched to JT65B on the final day of KP4AO EME operations: http://www.physics.princeton.edu/pulsar/K1JT/KP4AO_JT65B_1.png JT65 is supposed to be a weak-signal mode, and by WSJT standards most of these signals are anything but weak! We did our best to pick out and reply to some of the weaker ones, during the all-too-short time we allocated to JT65. I have not yet had time to go carefully through our JT65B recordings to decode all signals. To give you an idea of what's possible, here's what I decoded a few minutes ago, from a single one of the one-minute wave files: 

UTC Sync dB DT DF W            Message KV? 

-------------------------------------------------------------------

203300 0 -10 1.9 -640 4 # KP4AO G6HKS IO92 OOO 1 0

203300 5 -11 2.4 -231 13 * KP4AO PA3DOL JO22 1 0

203300 4 -12 1.8 -221 4 * KP4AO HA0HO KN07 1 0

203300 1 -22 1.5 -3 18 * KP4AO SQ7DQX JO91 1 0

203300 2 -16 2.0 366 7 * KP4AO SP1JPQ JO73 1 0

203300 0 -18 1.8 471 9 * KP4AO W6OUU DN22 1 0

203300 2 -4 1.6 822 4 * KP4AO AF6O DM14 1 0

203300 4 -12 1.7 1690 3 * KP4AO DF6SM JN58 1 0

203300 2 -14 1.8 1879 10 * KP4AO YL3HA KO26 1 0

203300 0 -14 1.7 2030 3 * KP4AO NA6MF CM87 1 0

203300 1 -17 4.3 2369 3 * KP4AO KR7O DM07 1 0

203300 5 -10 1.7 2412 3 * KP4AO DJ8MS JO63 1 0

203300 4 -8 1.7 2879 3 * KP4AO DH1WM JN49 1 0

203300 3 -7 0.7 2935 3 * KP4AO LU1C GF05 1 0

203300 2 -17 1.8 3261 1 * KP4AO W8PAT EN81 1 0

203300 0 -13 2.0 3312 9 * KP4AO EB3DYS JN11 1 0

203300 6 -15 2.2 3522 3 # KP4AO SK4AO JP70 OOO 1 0

Note that with all this QRM, numbers listed for "Sync" and "dB" may not be reliable.

 

I've received many requests for the wideband recordings from KP4AO, so a selection of them have now been posted on the WSJT web site at the following URLs:

http://www.physics.princeton.edu/pulsar/K1JT/EME_1.wav  4/16 startup

http://www.physics.princeton.edu/pulsar/K1JT/EME_2.wav  4/16 CW

http://www.physics.princeton.edu/pulsar/K1JT/EME_3.wav  4/16 CW

http://www.physics.princeton.edu/pulsar/K1JT/EME_4.wav  4/17 SSB

http://www.physics.princeton.edu/pulsar/K1JT/EME_5.wav  4/17 SSB

http://www.physics.princeton.edu/pulsar/K1JT/EME_6.wav  4/17 SSB

http://www.physics.princeton.edu/pulsar/K1JT/EME_7.wav  4/17 CW

http://www.physics.princeton.edu/pulsar/K1JT/EME_8.wav  4/17 CW

 

Files number 2-7 are all about 1 GB in size. File 1 is about 0.7 GB and file 8 only 41 MB. You may want to start with the shortest file, EME_8.wav, to get a feeling for what they all contain. With SpectraVue you should check "Invert Spectrum" on the "Wave File Input Setup" screen, and enter 432040000 in the "File Center Frequency" box. SpectraVue gives you date and time markers on the waterfall, so you can tell where you are (however, I've noticed that on 4/17 the times are certainly not correct). The data is blanked during KP4AO transmissions. The extremely strong KP4AO echo immediately follows each blanked interval. I prefer listening to these files with Linrad. This superb program is well worth the time required to learn how to use it effectively. If you already have some familiarity with the program, here's what you need to do to listen to the KP4AO files:

 

1. Create a file "adwav" with a line naming each of the EME_?.wav files

2. Start Linrad, select the desired file, enter "A" for weak-signal CW

3. Answer "Y" to "Interpret as I/Q data?"

4. Answer "Y" to "Invert frequency scale?"

5. Enter "432.040" in the frequency control box

 

Beyond these few hints to get you started, you're on your own with both SpectraVue and Linrad. I will appreciate it if you send me a list of all callsigns you hear in these recordings. With best wishes from the KP4AO gang, 

 

-- 73, Joe, K1JT

 


05.04.2010

In less that two weeks the Arecibo Observatory Amateur Radio Club will again put the 1000-foot radio telescope on the air for 432 MHz EME. 

The scheduled times of operation are:

April 16: 1645 - 1930 UTC

April 17: 1740 - 2020 UTC

April 18: 1840 - 2125 UTC

 

Callsign: KP4AO

 

Tx Frequency: 432.045 MHz

Rx Frequency: 432.050 to 432.060+

Tx power: 400 W, Antenna gain: 60 dBi, System noise temp: 120 K (cold sky), System noise temp: 330 K (when pointed at moon)

KP4AO can be heard with a small hand-held Yagi pointed at the moon, and a good receiver. A 15 dBi antenna and 100 W will be enough to work us on CW. Operators at KP4AO will do their best to work as many stations as possible. Each session will start with a brief announcement and CQ in SSB. SSB QSOs may continue for 30 minutes to an hour, if the QSO rate remains high. The mode will be shifted to CW as soon as it is judged that higher QSO rates would result. We will listen for calls at frequencies 5-15 kHz higher than our own, and even higher if QRM warrants. Callers who s-p-r-e-a-d o-u-t are more likely to be copied. If you've already worked us in any mode, please do not call again -- give others a chance. If we call "CQ QRP", we will listen for stations running 100 W or less to a single Yagi. Please do not answer such a CQ if you are running more power or have a larger antenna. On April 18, if we reach a condition where most calling stations have been worked, and we judge that operating in the digital mode JT65B would produce a higher QSO rate, we will switch to JT65B. Note that any of these planned operating strategies may be changed as circumstances dictate. We are extremely fortunate to have been granted access to the world's largest radio telescope for this amateur radio good-will event. We look forward to working as many stations as possible in the allotted time! 

-- 73 from Joe, K1JT, on behalf of all the gang at KP4AO


26.03.2010

Present expectations are that KP4AO will by on 432 MHz EME during their moon windows on April 16, 17, and 18. The appropriate times are:

Apr 16 1645 - 1930 UTC

Apr 17 1740 - 2020 UTC

Apr 18 1840 - 2125 UTC

-- 73, Joe, K1JT

 

23.03.2010

Hello to all , Thanks for all the good words and advice you are showing. I will pass them to Angel WP3R and Pedro NP4A . Let me remark how outstanding signals are from this end. Being active on HF too , the pile up is no different than any major pile up on HF. The operating conditions for pile up handling are not the best. At least for these two tests , we operate standup and with no earphones. Yesterday TX to RX was done with a PC , last Friday was completely manual with a mechanical switch and was not easy to do. The space is very limited because we where operating right at the waveguide transition to coax in a close space. For the official activity there will be much better conditions. Yesterday we had to stop for a few minutes to unwrap the platform because was getting to the limit rotation and start time was a bit delayed due to some finals requests from the AO direction. The JT65 transmission was made for test only and the RX screen was so overloaded that the rx level jumps from +1 to +25 . The PC used at the moment took for ever to decode .... The split operation provide a more smooth operation , but there was a lot of AO employees that wanted to hear the moon echoes ( that's why we use speaker only) that we had to check our own frequency often. Next month in the official activity I think things will be a bit more "scheduled". Congratulations to all stations who get thru the pile up and see you all in the moon next month. 

73 ANGEL WP4G

Poznámka OK1DFC -  v předpokládaném okně aktivity 15-17.04.2010 bude přítomen rovněž Joe K1JT a podle jeho poslední informace kterou od něj mám, bude k dispozici "KV jezdič" , který bude schopen zvládat pile up z KV provozu. Takže se mají všichni na co těšit a je předpoklad že si Puert Rico udělá opravdu každý. Hodně zdaru a GL ve spojení s nimi.


22.03.2010 - 12:54UTC

Folks:

 

I got a request from Sawson, KG6NUB, for near live updates for today's Arecibo Tests. Please send to Sawson directly while he works at Stanford U. Sawson also volunteers with W6YX, the Stanford Radio club. He wishes to collect datapoints on today's Arecibo EME reception, in between his professional work as Stanford. So, please send him (with copies to me apolloeme@live.com ) real time Arecibo spots, or updates to his email: sawson@w6yx.stanford.edu) So that he can break away from time to time from his staff work, and listen to the Arecibo chatter.

 

Again, exact time of Arecibo Radio Club operations today, not known, but the Arecibo window to the moon today, is between 20:40Z and 23:20Z

 

Thanks.

Best Regards,

73, de Pat Barthelow AA6EG apolloeme@live.com


22.03.2010 - 06:00 UTC

Folks: Angel and the Arecibo Radio Club will be testing with QSOs 22.03.2010. Dont know the exact times planned, but Arecibo maximum steerable window to the moon tomorrow is approximately 20:40Z to 23:20Z. And to be on or around 432.045mhz.

Best Regards, 73, de Pat Barthelow AA6EG

 

Arecibo Video Tours:

http://www.youtube.com/watch?v=vicxDnn6LEY

http://www.youtube.com/watch?v=7rFeXsVz8hE&NR=1


Hi all,

Angel, WP3R, has asked me to forward the information that on Monday, March 22, the Arecibo Observatory Amateur Radio Club will again be looking for EME contacts on 432.045 MHz. The callsign is KP4AO, the locator is FK68oi, and the Monday window is between about 2100 and 2330 UTC. They will again be using both CW and SSB. Good luck to all! -- 73, Joe, K1JT

 

PS: Several have asked me whether there would be any JT65 operation. As far as I know, the answer is NO -- at least for this session. Please remember, JT65 is a Weak Signal mode. The Arecibo signal is not weak! ... for any normally EME-capable station, in the limited time window they can work many more stations using CW or SSB than could be worked with the much slower JT65 mode. Possibly by the time of the planned April session there will be provision for some JT65 contacts.

 

 

For those who were asking about the setup at Arecibo, I now have more complete information. It turns out that they *did* get their 3CX800 amp out of mothballs and hooked up in time for the tests. No wonder they were so loud! Here's the scoop: Antenna: Tx and Rx with the same circular polarization (I don't know which sense). The expectation is that ground stations will use linear polarization, and thus Faraday will not be a problem.

 

Rx: GaAsFET preamp into a TS-2000.

Tx: A second TS-2000 driving a 3CX800, 500 W measured output.

T/R switchover was done with a hand-operated mechanical switch -- one reason why their T/R turnaround time sometimes seemed slow. They expect to have a T/R relay in place for the session on Monday.

 

Once again: KP4AO expects to be QRV on 432.045 from about 2100 to 2330 UTC on Monday.