March 2015 - AMSAT-BB - mailman.amsat.org

UT1FG/MM heard from DK69
by Bryan Green 19 Mar '15

19 Mar '15

On SO-50 at 0425z pass earlier this evening. Heard loud and clear signing from DK69 in CM98 but did not yet QSO. Soon! 73! -- bag KL7CN/W6 CM98

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SO-50 newbie question
by Steve Kristoff 18 Mar '15

18 Mar '15

On the most recent pass of SO-50 over EM79, just minutes ago (about 0248 to about 0301), I didn't hear anybody! Max elevation was about 78 degrees so it should have been a good pass. I have had good contacts on past passes, but I have never heard nothing before today. Just wondering if I was doing something wrong, or that just happens sometimes, or was the satellite wounded by the recent solar radiation attack? Steve Kristoff AI9IN EM79ji Oldenburg IN skristof(a)etczone.com

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Balloon launch at BBC Stargazing live + New OSCAR News
by M5AKA 18 Mar '15

18 Mar '15

OSCAR News Issue 209 available to members http://amsat-uk.org/2015/03/18/oscar-news-issue-209/ UK CanSat 2015 Winner Announced http://amsat-uk.org/2015/03/14/uk-cansat-2015-winner/ ITU: Small satellite communication systems regulatory requirements http://amsat-uk.org/2015/03/16/itu-small-satellite-communication-systems-re… 434 MHz balloon launch at BBC Stargazing event http://amsat-uk.org/2015/03/16/434-mhz-balloon-launch-at-bbc-stargazing-eve… Two Million Packets Uploaded to Data Warehouse http://amsat-uk.org/2015/03/15/two-million-packets-uploaded-to-warehouse/ ---- Trevor M5AKA AMSAT-UK Website http://amsat-uk.org/ Facebook https://www.facebook.com/amsatuk Twitter https://twitter.com/AMSAT_UK ----

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N2IEN in Haiti 4/4-4/6
by Paul Stoetzer 18 Mar '15

18 Mar '15

Good morning, I noticed this posted on N2IEN's QRZ page this morning: "Dxpedition to HH coming April 4-6!! Mostly HF cw, some SSB. And will try to work SO 50 satellite. Hopefully I'll also be QRV RTTY. " Pat has done very well from the rarely heard FJ and VP2V over the past month with his Yaesu VX-8 and Arrow antenna. His QSL manager is NR6M. 73, Paul, N8HM

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Fwd: Live ham radio show tonight Tuesday 8 PM
by wa4hfn＠comcast.net 17 Mar '15

17 Mar '15

----- Forwarded Message ----- From: "Tom" <wa5kub(a)gmail.com> To: "Tom" <wa5kub(a)gmail.com> Sent: Tuesday, March 17, 2015 2:47:20 PM Subject: Live ham radio show tonight Tuesday 8 PM Put a reminder on your pc. Tonight at 8:00 PM is the new live ham radio show "Amateur Radio Roundtable" . go to w5kub.com to watch it at 8:00 PM. The show is every Tuesday night at 8:00 PM central. We have special guests from around the world. Tonights show will feature Michael Kalter W8CI from the Dayton Hamvention, and Bharathi VU2RBI from India. We will also have some arduino segments regarding cw. Thanks, Tom W5KUB -- Live ham radio show Amateur Radio Roundtable every Tues night at 8:00 PM central (0200 UTC Weds) on W5KUB.COM Please check out our ham radio video broadcast page at http://w5kub.com and please join our W5KUB video facebook group at https://www.facebook.com/groups/279273778772594/ Senior Member of the I.E.E.E

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PQ2 Brazil Satellite Operation March 20-22
by JoAnne Maenpaa 17 Mar '15

17 Mar '15

Just a heads up for a DX opportunity that will occur before the next ANS bulletins are sent: Ohio/Penn DX Bulletin #1206 PQ2, BRAZIL (Satellite/6m Op). Operators Pedro/PR8ZX and Augusto/PU8MET will be active as PQ2ZXT and PQ2/PU8MET, respectively, from Tocantins State (WW Loc. GI64) between March 20-22nd. Activity will be on the satellites and 6 meters. There are very few operators in this state. QSL via LoTW or their home callsign, direct or by the Bureau. -- 73 de JoAnne K9JKM k9jkm(a)amsat.org AMSAT VP User Services

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Re: [amsat-bb] Moxon on top a Baofeng UV-5R for 70cm experiment
by Richard Tejera 17 Mar '15

17 Mar '15

Pavel, yes, the Baofengs are going to defense on 70 cm, it's what you get for $30.00. The good news is Fox 1 is U/V, so the De Sense shouldn't be a problem. Or at least less of one. 73 Rick K7TEJ On March 16, 2015, at 19:50, Pavel Milanes Costa <co7wt(a)frcuba.co.cu> wrote: Yes, that's the tool for the job. That was my starting point, then with mmana and nec I made some adjustments on the design, cosmetics adjustments... The final result is few mm more or less against the generated by moxgen... A few minutes ago I tested the antenna on the SO-50 pass... 56 degrees pass here, among others I heard K8YSE, UE1FG/MM, K?8KW, K4FEG. RX: Success, strong and clear signal till LOS... TX: a real failure, STRONG desense, I think it's problem of the "cheap" RX radio... Setup here: RX Baofeng UV-5R with the moxon on top, almost ZERO coax length, TX Feidaxing FD 268A 5/1 W with coax to a Jpole with almost 10m of RG-213 Coax... (+ 1m of soft RG-58 pitgail from the radio to the RG-213) The Jpole is 5 meters away and about 2 meters above my head. No matter if I use 1 or 5 Watts, once I press PTT the baofeng goes deaf and only noise is heard with my scrambled voice on it (this voice is not from the sat) This can be the 3rd harmonic of 2m, but it's normal to get this behavior with the baofeng or other radios? What can I do for improve/solve this situation? A low pass filter (LPF) for 2m right on the output of the TX radio? The Baofeng is the only option here for RX on 70cm... this is driving me crazy... 73 El 16/03/15 a las 20:37, Richard Tejera escribió: > Pavel, > > Here is a link to a program as m called MOXGEN. It will calculate the dimensions for a moxon given the frequency &wire size. Once done it'll generate an EZ-NEC model for the antenna. > > The model should give you a good idea of the gain, beamwidth & front to back > > http://www.moxonantennaproject.com/design.htm > > I'd be interested I what it tells you. > > 73 > Rick > K7TEJ > > > > On March 16, 2015, at 17:05, Pavel Milanes Costa <co7wt(a)frcuba.co.cu> wrote: > > Hi to all. > > Yesterday I was evaluating the construction of a small antenna for > portable use on top of the Baofeng UV-5R... at the end I finished with > two choices CJU vs moxon for 70cm handheld > > After some modeling I choose the moxon over the CJU because: > - Smaller > - Less wire > - Less weight > - Less stress for the connector > - Just ~0.6 dB down vs the CJU > - By far better F/B ratio > > After completion of the first "prototype"... > > I successfully heard the CW beacon of Jugnu, CO-57, CO-58, PRISM and others. > > The fire test will be tonight on SO-50, I know now I will copy ok, but > the challenge is eliminate the desense of having two yaguis on a cross boom. > > I will test the moxon handheld on RX (UHF) and a Jpole for the 2m uplink > with 5W of a handheld. > > I have not measured the SWR of the moxon, but with the simulation the > measures are not "that critical" for getting a less than 1:2 of SWR over > the entire 70cm band (1:3 bandwidth is about 16 Mhz) > > The moxon "experiment" is just ~25 cm width and ~15 cm height (may be > smaller also, the minimal height is ~10cm + connector) over the Baofeng > UV-5R, there is no much stress on the connector. > > I used a SMA to BNC adapter (the kind with a rim to fit tight to the > radio body) and then a clamp on BNC (male) with a bronze tube as coaxial > shield/boom of the antenna. > > Wish me luck with the desense problem... > > 73 >

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Scottsdale AZ Hamfest, Saturday (21 March)
by Patrick STODDARD (WD9EWK/VA7EWK) 17 Mar '15

17 Mar '15

Hi! After spending Saturday in Tucson, I'm back to a hamfest next Saturday. The Scottsdale Amateur Radio Club is hosting its annual Springfest hamfest on Saturday, 21 March 2015. It will be in the parking lot at the Mountain Valley Church, on Perimeter Drive north of Princess Drive and west of AZ-101 exit 36 in Scottsdale AZ. The hamfest is a half-day event, typical of most hamfests in this state. More information about the hamfest is available at: http://scottsdalearc.org/springfest-our-version-of-a-swap/springfest-2015-m… I will have an AMSAT table at this hamfest, offering demonstrations of satellite operating using any satellites passing by in the morning - including attempts at QSOs using the ISS packet/APRS digipeater using APRS messages from the hamfest site, located in grid DM43. I will use my own call, WD9EWK, for these demonstrations. As with my other demonstrations, I will upload all QSOs to Logbook of the World. If you work WD9EWK at the hamfest and want to receive a QSL card, please e-mail me after the hamfest with the QSO details. If you are in my log, I will be happy to send you a QSL card. 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/

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Re: [amsat-bb] Moxon on top a Baofeng UV-5R for 70cm experiment
by Richard Tejera 17 Mar '15

17 Mar '15

Pavel, Here is a link to a program as m called MOXGEN. It will calculate the dimensions for a moxon given the frequency &wire size. Once done it'll generate an EZ-NEC model for the antenna. The model should give you a good idea of the gain, beamwidth & front to back http://www.moxonantennaproject.com/design.htm I'd be interested I what it tells you. 73 Rick K7TEJ On March 16, 2015, at 17:05, Pavel Milanes Costa <co7wt(a)frcuba.co.cu> wrote: Hi to all. Yesterday I was evaluating the construction of a small antenna for portable use on top of the Baofeng UV-5R... at the end I finished with two choices CJU vs moxon for 70cm handheld After some modeling I choose the moxon over the CJU because: - Smaller - Less wire - Less weight - Less stress for the connector - Just ~0.6 dB down vs the CJU - By far better F/B ratio After completion of the first "prototype"... I successfully heard the CW beacon of Jugnu, CO-57, CO-58, PRISM and others. The fire test will be tonight on SO-50, I know now I will copy ok, but the challenge is eliminate the desense of having two yaguis on a cross boom. I will test the moxon handheld on RX (UHF) and a Jpole for the 2m uplink with 5W of a handheld. I have not measured the SWR of the moxon, but with the simulation the measures are not "that critical" for getting a less than 1:2 of SWR over the entire 70cm band (1:3 bandwidth is about 16 Mhz) The moxon "experiment" is just ~25 cm width and ~15 cm height (may be smaller also, the minimal height is ~10cm + connector) over the Baofeng UV-5R, there is no much stress on the connector. I used a SMA to BNC adapter (the kind with a rim to fit tight to the radio body) and then a clamp on BNC (male) with a bronze tube as coaxial shield/boom of the antenna. Wish me luck with the desense problem... 73 -- M.Sc. Pavel Milanes Costa, CO7WT SYSOP Nodo Gateway CO9JAZ Ciudad de Camagüey, Camagüey, Cuba. Cell: (+53) 53-847819 _______________________________________________ Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

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Moxon on top a Baofeng UV-5R for 70cm experiment
by Pavel Milanes Costa 17 Mar '15

17 Mar '15

Hi to all. Yesterday I was evaluating the construction of a small antenna for portable use on top of the Baofeng UV-5R... at the end I finished with two choices CJU vs moxon for 70cm handheld After some modeling I choose the moxon over the CJU because: - Smaller - Less wire - Less weight - Less stress for the connector - Just ~0.6 dB down vs the CJU - By far better F/B ratio After completion of the first "prototype"... I successfully heard the CW beacon of Jugnu, CO-57, CO-58, PRISM and others. The fire test will be tonight on SO-50, I know now I will copy ok, but the challenge is eliminate the desense of having two yaguis on a cross boom. I will test the moxon handheld on RX (UHF) and a Jpole for the 2m uplink with 5W of a handheld. I have not measured the SWR of the moxon, but with the simulation the measures are not "that critical" for getting a less than 1:2 of SWR over the entire 70cm band (1:3 bandwidth is about 16 Mhz) The moxon "experiment" is just ~25 cm width and ~15 cm height (may be smaller also, the minimal height is ~10cm + connector) over the Baofeng UV-5R, there is no much stress on the connector. I used a SMA to BNC adapter (the kind with a rim to fit tight to the radio body) and then a clamp on BNC (male) with a bronze tube as coaxial shield/boom of the antenna. Wish me luck with the desense problem... 73 -- M.Sc. Pavel Milanes Costa, CO7WT SYSOP Nodo Gateway CO9JAZ Ciudad de Camagüey, Camagüey, Cuba. Cell: (+53) 53-847819

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