February 2007 - AMSAT-BB - mailman.amsat.org

New IARU Vienna Papers include EME
by Trevor 04 Feb '07

04 Feb '07

The IARU Region 1 Interim Conference will be held in Vienna from February 24 to 25th 2007. New C5 (VHF-UHF-uW) papers that will be discussed at this conference and the final agenda are now available. Among the additions is B29 - "EME Operating". I understand there has been some adverse comment received regarding paper B01 - "Increased Amateur Satellite Service 2 Metre Usage". You can join the C5 VHF-UHF-uW discussion group at http://uk.groups.yahoo.com/group/ukc5discussion/ or email: ukc5discussion-subscribe(a)yahoogroups.co.uk The IARU newsletter is available at http://uk.groups.yahoo.com/group/ukc5discussion/files/newsletter_44.pdf Paper B08 - "The need for minimum requirements for a valid digital QSO" has proved controversial and the developer of WSJT, Joe Taylor K1JT, has compiled a document regarding the proposal that can be found in the appendix. 73 Trevor M5AKA --------------- Daily Amateur Radio RSS News: http://www.southgatearc.org/ Email your news items to: editor at southgatearc.org News On Your Website: http://www.southgatearc.org/rss/index.htm News On Your PC: http://www.southgatearc.org/rss/newsreader.htm Upload Your News: http://www.southgatearc.org/news/your_news.htm --------------- ____________________________________________________ Yahoo! Photos is now offering a quality print service from just 7p a photo. http://uk.photos.yahoo.com

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IO-26 MBL telemetry decoder
by Mineo Wakita 04 Feb '07

04 Feb '07

IO-26 MBL (Safe Mode) telemetry decoder: http://www.ne.jp/asahi/hamradio/je9pel/io26deco.htm --------------------------------------------- Name: Mineo Wakita / JE9PEL, JAMSAT member Mail: ei7m-wkt(a)asahi-net.or.jp URL : http://www.ne.jp/asahi/hamradio/je9pel/ QTH : Yokohama Japan, GL:pm95tj Date: Feb 4, 2007 ---------------------------------------------

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Adding a Pre-amp to a standard tranciever
by sraas＠optonline.net 04 Feb '07

04 Feb '07

I am considering my next station upgrade to be mast mounted preamp(s). I prefer the NON R.F. switching type due to their general better performance/cost and leaving me the ability to run QRO is need be in the future. My only experience is using a preamp with a transverter where there are seperate RX and TX lines. Now I do fully understand that you cannot TX threw these devices. My radio DOES have the ability to send DC voltage threw the coax while recieving ( IC 820H ). Even tho the radio can do this, I just dont understand how it works or if I would still need to use a sequencer. And even at all that... how an ARR preamp ( example ) can pass any sort of RF. The only way I can see how it would work is if some sort of switch is inplace @ the antennas as well, the DC from the radio or sequencer switches the preamp IN place when RX'ing and OUT of place when TX'ing. Now if this is indeed the case.. and im going to assume it is.. where would I begin to look for a Coaxial Relay that can pass 1kw @ 432 / 144 mhz? Now I know your thinking HU? 1KW!!! This is not my intended power level for the sats.. dont worry.. its for ( in the future ) possibly trying some single or dual yagi EME. -Steve Raas N2JDQ FN20vg

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Re: AO-07 Downlink Antenna
by Fred A Parker 04 Feb '07

04 Feb '07

Is your inverted-V cut for ten meters? If an inverted-V cut for the one of lower bands say 80 meters is used for ten meters with an antenna tuner. In actuality it forms a Vee Beam antenna pointing straight up beaming at the stars. This is common mistake many amateurs make that I have not seen covered in any antenna articles. Fred KF0AK

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Re: Russian speaking QRM on AO-51 Rev:
by Andrew Hodges 04 Feb '07

04 Feb '07

Hi, I have to chime in and also vote for the re-introduction of PL on AO-51. Whilst I agree with the sentiment about capture effect and just being better than the pirates, I also agree with the comments about battery power etc. To add another perspective to the mix, I am sure there are many that would find it hard to differentiate between legitimate and non-legitimate traffic. Being one of those people that can only speak English, and not Indonesian, Malaysian, Cantonese etc etc, it's a little hard to differentiate between real amateurs and pirates. Though I admit regular exchange of callsigns is the habit of amateurs, it can still be tough with Multiple stations. At least with PL, you can determine that there was real "intent" to be on the bird. My 2cents worth.... Regards Andrew VK8AH

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Adding a Pre-amp to a standard tranciever..cont
by sraas＠optonline.net 04 Feb '07

04 Feb '07

I probabally should add the configuration I would like to have... TRANCIEVER-------->DCI FILTER------->Preamp----------->Antenna ( Recieve Configuration) Tranciever---------->Antenna (TX configuration) Ultimatally I would like to NOT transmit threw the DCI filter. I have found some coaxial relays.. and im thinking ( still unsure of this all ) that I would need a 4 port SPDT type relay? -Steve Raas N2JDQ

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Russian speaking QRM on AO-51 Rev: 13642
by Justin Burket 03 Feb '07

03 Feb '07

Hello from Fairbanks Alaska, Towards the end of my local coverage the uplink was jammed up with some nice sounding Russian speaking ladies chatting away on a phone. Their input into the bird wasn't that hot but enough to turn on the downlink and keep it on. Chalk this e-mail up for another vote to reactivate the PL tone. Those of us running QRP into the bird work hard enough pointing the antenna and getting to a good contact point without having to consider QRM on top of everything. Not to mention the whole 2 miles uphill in the snow in the cold bit... :) Justin Burket (KL1RL) Location: BP64CU Antenna: Stock arrow with "stickers" to get another 3dB performance boost ;) Radio: Yaesu FT-530 pushing 5 watts of pure love.

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SO-33 telemetry
by Mike Rupprecht 03 Feb '07

03 Feb '07

Hi, telemetry frames received from SO-33 (SEDSAT) this afternoon. [437.910 MHz 9k6 FSK] #1 Uptime is 001/00:22:00 ........................................ Main Voltage : 20663 mV Main Current : 752 mA Amps in Batteries : -621178 mA Temp Battery 1 : 13 °C Temp Battery 2 : 12 °C Temp CDC DC/DC : 22 °C Temp Mode-L DC/DC : 25 °C Temp EMP : 11 °C Temp MB DC/DC : 0 °C Temp Deployer 1 : -6 °C Temp Deployer 2 : 9 °C Temp Mode-L PA : 9 °C Power Solar Panel +X : 134 mA Power Solar Panel +Y : 0 mA Power Solar Panel +Z : 319 mA Power Solar Panel -X : 26 mA Power Solar Panel +Y : 566 mA SEASIS Boot Status : 3 (not booted because CDS detected a reset or power cycle on last boot) CDS Boot Status : 1 (last boot was due a power cycle) Power Mode : 4 Mode-L State : 1 Mode-A State : 0 Camera State : 0 SEASIS State : 0 Reset Count : 0 Panel State : 0 ======================================== 73, Mike DK3WN 03.02.2007, 15:16:00 UTC ctrl: 3 {UI} PID: F0 {No L3} Total Frame Bytes: 39 from SEDSAT-1 to TIME-1: 1 > 55 70 74 69 6D 65 20 69 73 20 30 30 31 2F 30 30 3A 32 32 3A 21 > 30 30 0D Uptime is 001/00:22:00 -------------------------------------------------------------------- 03.02.2007, 15:16:01 UTC ctrl: 3 {UI} PID: F0 {No L3} Total Frame Bytes: 129 from SEDSAT-1 to -1: 1 > 05 05 00 02 B7 50 00 00 05 05 00 08 F0 02 00 00 05 05 00 00 21 > 86 85 F6 FF 05 15 00 05 86 00 00 00 00 00 00 00 3F 01 00 00 41 > 1A 00 00 00 36 02 00 00 05 03 00 09 04 00 05 02 00 0A 01 05 61 > 02 00 0B 00 05 02 00 0D 00 05 02 00 0C 00 05 02 00 0F 00 05 81 > 0B 00 04 0D 0C 16 19 0B 0A FA 09 00 09 05 02 00 07 01 05 02 101 > 00 06 03 05 02 00 03 00 05 02 00 0E 00 -------------------------------------------------------------------- 03.02.2007, 15:17:00 UTC ctrl: 3 {UI} PID: F0 {No L3} Total Frame Bytes: 39 from SEDSAT-1 to TIME-1: 1 > 55 70 74 69 6D 65 20 69 73 20 30 30 31 2F 30 30 3A 32 33 3A 21 > 30 30 0D Uptime is 001/00:23:00 -------------------------------------------------------------------- 03.02.2007, 15:17:01 UTC ctrl: 3 {UI} PID: F0 {No L3} Total Frame Bytes: 129 from SEDSAT-1 to -1: 1 > 05 05 00 02 B7 50 00 00 05 05 00 08 E5 02 00 00 05 05 00 00 21 > 1B AC F6 FF 05 15 00 05 A3 01 00 00 00 00 00 00 62 01 00 00 41 > 00 00 00 00 42 01 00 00 05 03 00 09 04 00 05 02 00 0A 01 05 61 > 02 00 0B 00 05 02 00 0D 00 05 02 00 0C 00 05 02 00 0F 00 05 81 > 0B 00 04 0D 0D 14 19 0B 0A FB 09 00 09 05 02 00 07 01 05 02 101 > 00 06 03 05 02 00 03 00 05 02 00 0E 00

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Re: AO-07 Downlink Antenna
by Wayne Estes 03 Feb '07

03 Feb '07

Steve wrote: Im having really poor luck with my inverted V antenna.. its not very high up but only on a very high pass will it hear the beacon on 29.502. What is every one else using? Wayne replies: During field day I've had success on AO-7 Mode A using a 10m inverted Vee with the apex 12 feet high. That's 3/8 wavelength high which is the best height for satellite reception. More gain near the horizon where the path is longest, but no nulls at high elevation. The inverted Vee seems to be fairly omnidirectional in the azimuth plane, compared to a flat dipole which has nulls at the ends. A horizontal full wave loop will give better reception at low elevations (where you need the most gain), but worse reception at high elevations. I've been meaning to put the Vee up at home. I even have an ARR 10m preamp to put at the feedpoint, and a PTT-activated coaxial relay to prevent me from accidentally transmitting into the preamp. Just have to get around to it... Wayne Estes W9AE Oakland, Oregon, USA, CN83ik

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Re: AO-07 Downlink Antenna
by Edward R. Cole 03 Feb '07

03 Feb '07

At 04:31 PM 2/3/2007 +0000, w7lrd(a)comcast.net wrote: > >Tyler-Think about a 10 meter full wavelength loop inside 1/2 inch pvc laying on your roof. I used one for many years on rs10 and 15. A little more gain and less directive than a dipole. The length will be 1005/F(mhz) >73 Bob W7LRD >Seattle > >-------------- Original message -------------- >From: "Tyler Harpster" <tyler881(a)adelphia.net> > >> I just bought a 10 meter preamp from Advanced Receiver Research. I was >> planning on making a 10 meter dipole and feeding the voltage supply for the >> mast mounted preamp up the coax. Will this be enough to hear the bird? Bob, I guess the height of the horizontal loop works well for a NIV antenna (beaming high angles). I have thoughts of putting up a 10m J-Pole using a ten foot tower section as the base and extending with 1-Inch aluminum tubing for the required length (3/4 wavelength total). This will likely provide lower radiation angles (which is desirable for DX). The J-pole does not require a ground plane so hoping this will work well. A J-Pole works well using a flagpole as a stealth antenna - just use the top section length as required at the operating freq. Tyler, My experience with ARR preamps is with models not set up for coax line powering. If you are uncertain, you might check on this. To use coax line power with a preamp not providing the required circuitry one must add T-bias units on both ends of the coax (unless your radio has the capability of powering an external preamp). 73's, Ed - KL7UW ========================================= BP40iq, Nikiski, AK http://www.qsl.net/al7eb Amsat #3212 Modes: V - U - L - S USA Rep. for Dubus Magazine: dubususa(a)hotmail.com =========================================

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