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DL0SHF 10GHZ EME BEACON The DL0SHF 10GHz EME Beacon The DL0SHF beacon is a tremendous resource for anyone interested in 10GHz EME. It not only gives you something to listen when activity is low (which is much of the time!), but provides a frequency reference (10368.025 MHz)and a constant strength signal which can be used for testing system performance. MEASUREMENT OF SUN NOISEQ65 SETUP 1296 EME
Select Q65 and the screen should look something like that shown below: The important settings are shown in red when setting up for Q65-30B operation. Make sure 23cm is set so that the Doppler calculations are correct. Make sure that the DC Call and DX Grid boxes are populated if you have that information (this will enable AP to work better) TAMRON SP 70-300MM F/4-5.6 DI VC USD REVIEW CANON FD TO EOS LENS ADAPTERS CANON EOS LENS ADAPTERS Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a CanonEOS body.
PRO OPTICS 500MM F6.3 MIRROR LENS The fastest 500mm lenses are f4.0 and f6.3 is only 1.3 stops slower. There are quite a few 500mm mirror lenses which claim to be f8, so f6.3 would be 2/3 stop faster (but see the section on T-stops below). The price of the Pro Optics 500/6.3 lens with a Canon EOS mount adapter is around $160, which qualifies as cheap in most people'sbook.
Q65- LONGER PERIOD OR AVERAGE? The Q65 mode for digital EME gives you a couple of options which will increase decode sensitivity for weaker signals. You can select from 30s, 60s, 120s or 300s transmision periods, with longer periods providing higher sensitivity. You can also average received signals, LENS TO EYEPIECE ADAPTERS A typical adapter of this type has a 0.965" diameter tube screwed into one face, and this normally slips into the 0.956" internal diameter focusing tube of the telescope. Screwed into the other face of the unit is a 0.956" internal diameter eyepiece holder, into which slips the 0.965" diameter eyepiece. This is shown in the diagram below: KA1GT 432 EME SYSTEM KA1GT EME Page. I initially began working EME on 432MHz in the late 1970s. Around 1979 I built 16 8-element Quago antennas. They were simple to build. Wooden booms with aluminum director elements glued through holed drilled in the boom and copper wire loops for the driven element and reflector. One you have the technique down, you can buildone
DL0SHF 10GHZ EME BEACON The DL0SHF 10GHz EME Beacon The DL0SHF beacon is a tremendous resource for anyone interested in 10GHz EME. It not only gives you something to listen when activity is low (which is much of the time!), but provides a frequency reference (10368.025 MHz)and a constant strength signal which can be used for testing system performance. MEASUREMENT OF SUN NOISEQ65 SETUP 1296 EME
Select Q65 and the screen should look something like that shown below: The important settings are shown in red when setting up for Q65-30B operation. Make sure 23cm is set so that the Doppler calculations are correct. Make sure that the DC Call and DX Grid boxes are populated if you have that information (this will enable AP to work better) TAMRON SP 70-300MM F/4-5.6 DI VC USD REVIEW CANON FD TO EOS LENS ADAPTERS CANON EOS LENS ADAPTERS Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a CanonEOS body.
PRO OPTICS 500MM F6.3 MIRROR LENS The fastest 500mm lenses are f4.0 and f6.3 is only 1.3 stops slower. There are quite a few 500mm mirror lenses which claim to be f8, so f6.3 would be 2/3 stop faster (but see the section on T-stops below). The price of the Pro Optics 500/6.3 lens with a Canon EOS mount adapter is around $160, which qualifies as cheap in most people'sbook.
Q65- LONGER PERIOD OR AVERAGE? The Q65 mode for digital EME gives you a couple of options which will increase decode sensitivity for weaker signals. You can select from 30s, 60s, 120s or 300s transmision periods, with longer periods providing higher sensitivity. You can also average received signals, RADIO PROPAGATION BY TROPOSPHERIC SCATTERING Radio Propagation by Tropospheric Scattering. Author: Bob Atkins -KA1GT The
nature of radio wave propagation changes considerably as we move from HF through VHF/UHF and on to the microwave bands. THE BEST CANON EOS LENSES The BEST Canon EOS Lenses "Best" is a subjective term and selecting the "best" lens is often a matter of compromise between cost, size, weight, how often the lens will be used, how convenient the lens is to use and, of course, the optical quality of the lens. LOW COST 10GHZ EME RX The waveguide section of the LNBF - Tuning. 1 - Low cost 10Ghz EME Rx - The LNBF. 2 - Modifying the LNBF. 3 - Tuning the LNBF. 4 - Pictures and Plots. The white plastic cover over the front of the LNBF just pops off. Easier said than done since it's a tight fit, but if you keep pulling eventually you'll get it off. CANON EF 70-300/4-5.6IS USM LENS REVIEW Canon EF 70-300mm f/4-5.6 IS USM Review. The is the replacement for the EF75-300/4-5.6 IS USM, but the difference is much more than just 5mm at the short end of the range. According to Canon, the new lens uses a low dispersion optical element for better image quality, digitally optimized coatings to lower flare, an improved IS system giving an extra stop of "handholdability" and a panning mode SIGMA 150-500MM F/5-6.3 APO DG OS HSM REVIEW The Sigma 150-500mm f/5-6.3 DG APO OS is a very nice lens, especially considering the price which is currently around $870 (02/14 and includes a $200 instant rebate). The optical sharpness is excellent at shorter focal lengths and still very good through 400mm. The harpness does drop a little when the lens is used at 500mm wide open, thoughCANON EOS 5D MKII
Canon EOS 5D MkII. The Canon EOS 5D MkII is the successor to the EOS 5D, the first "reasonably" priced full frame 35mm digital SLR. CAMERA LENS TESTING- SHARPNESS, CHROMATIC ABERRATION AND Analyzing Lens Testing Chart Images. The images you shoot can be analyzed for sharpness and chromatic aberration quite easily. The numbers on the lens testing chart represent the line pairs per mm (lp/mm) values of the test patterns they are next to. These CANON FD TO EOS LENS ADAPTERS The ELEFOTO FD to EOS adapter seems to do quite well as long as the original lens is stopped down to at least f4 and preferably at least f5.6. At wide apertures (f1.8, f2.8) the image was soft and lacking in contrast, at least with the fast lenses I tested it with (24/2.5 and50/1.8).
BOBATKINS.COM
Canon EOS 5D vs. Canon EOS 40D. With Canon's "instant rebates" on the EOS 5D and EOS 40D, many photographers are considering upgrading to one or the other. The 5D is about twice the cost of the 40D, so it's an obvious question whether the 5D or 40D is the "better" upgradepath.
MIRROR LENSES
However keep in mind that the price of a new Tamron 500/8 lens is $400, while a used Canon EF500/4.5L will probably cost you around $3000 - and its replacement, a new EF500/4L IS, will cost you at least double that. The Tamron weighs about 19oz, while the 500/4.5L weighs 6.6lbs and the 500/4L IS weighs about 8.5lbs. BOB ATKINS PHOTOGRAPHY HOME PAGE BobAtkins Photography has been an online presence for over 20 years and is an unbiased source of hands-on equipment reviews, tutorials on optics and photography, information about the Canon EOS system and digital photography in general. There's a lot here, so be sure to use the search function to help you find what you are looking for KA1GT 432 EME SYSTEM KA1GT EME Page. I initially began working EME on 432MHz in the late 1970s. Around 1979 I built 16 8-element Quago antennas. They weresimple to build.
LOW COST 10GHZ EME RX Low cost 10Ghz EME Rx System . 1 - Low cost 10Ghz EME Rx - The LNBF 2 - Modifying the LNBF; 3 - Tuning the LNBF; 4 - Pictures and Plots. NOTE: This is not intended to be a definitive "how to" article, but may serve as a guide for those interested in receiving 10GHz EME signals at minimum cost and complexity. Why 10Ghz DL0SHF 10GHZ EME BEACON The DL0SHF 10GHz EME Beacon The DL0SHF beacon is a tremendous resource for anyone interested in 10GHz EME. It not only gives you something to listen when activity is low (which is much of the time!), but provides a frequency reference (10368.025 MHz)and a constant strength signal which can be used for testing system performance.Q65 SETUP 1296 EME
Quick Q65 setup guide - KA1GT Information on Radio Amateur VHF, UHF and Microwave systems TAMRON SP 70-300MM F/4-5.6 DI VC USD REVIEW BOB ATKINS - GITZO CARBON FIBER TRIPODS - 1325 AND 1227GITZO TRIPODS USAGITZO TRIPODS WEBSITEVINTAGE GITZO TRIPODS Gitzo have long had a reputation for manufacturing very sturdy, very reliable, fairly expensive tripods. With the intoduction of the carbon fiber tripods they have gained the reputation of also manufacturing very sturdy, fairly reliable, fairly light and very expensive tripods! MEASUREMENT OF SUN NOISE CONTRAST DETECTION AF Contrast Detection AF - Can it miss focus? Sigma 150-600 Contemporary. It's a widely held belief, backed up with experimental evidence, that Contrast detection AF (which is what is used by most cameras in Live View mode) is more accurate and more consistent then CANON EOS LENS ADAPTERS Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a CanonEOS body.
BOB ATKINS PHOTOGRAPHY HOME PAGE BobAtkins Photography has been an online presence for over 20 years and is an unbiased source of hands-on equipment reviews, tutorials on optics and photography, information about the Canon EOS system and digital photography in general. There's a lot here, so be sure to use the search function to help you find what you are looking for KA1GT 432 EME SYSTEM KA1GT EME Page. I initially began working EME on 432MHz in the late 1970s. Around 1979 I built 16 8-element Quago antennas. They weresimple to build.
LOW COST 10GHZ EME RX Low cost 10Ghz EME Rx System . 1 - Low cost 10Ghz EME Rx - The LNBF 2 - Modifying the LNBF; 3 - Tuning the LNBF; 4 - Pictures and Plots. NOTE: This is not intended to be a definitive "how to" article, but may serve as a guide for those interested in receiving 10GHz EME signals at minimum cost and complexity. Why 10Ghz DL0SHF 10GHZ EME BEACON The DL0SHF 10GHz EME Beacon The DL0SHF beacon is a tremendous resource for anyone interested in 10GHz EME. It not only gives you something to listen when activity is low (which is much of the time!), but provides a frequency reference (10368.025 MHz)and a constant strength signal which can be used for testing system performance.Q65 SETUP 1296 EME
Quick Q65 setup guide - KA1GT Information on Radio Amateur VHF, UHF and Microwave systems TAMRON SP 70-300MM F/4-5.6 DI VC USD REVIEW BOB ATKINS - GITZO CARBON FIBER TRIPODS - 1325 AND 1227GITZO TRIPODS USAGITZO TRIPODS WEBSITEVINTAGE GITZO TRIPODS Gitzo have long had a reputation for manufacturing very sturdy, very reliable, fairly expensive tripods. With the intoduction of the carbon fiber tripods they have gained the reputation of also manufacturing very sturdy, fairly reliable, fairly light and very expensive tripods! MEASUREMENT OF SUN NOISE CONTRAST DETECTION AF Contrast Detection AF - Can it miss focus? Sigma 150-600 Contemporary. It's a widely held belief, backed up with experimental evidence, that Contrast detection AF (which is what is used by most cameras in Live View mode) is more accurate and more consistent then CANON EOS LENS ADAPTERS Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a CanonEOS body.
RADIO PROPAGATION BY TROPOSPHERIC SCATTERING Radio Propagation by Tropospheric Scattering. Author: Bob Atkins -KA1GT The
nature of radio wave propagation changes considerably as we move from HF through VHF/UHF and on to the microwave bands. LENS TO EYEPIECE ADAPTERS Lens to eyepiece adapters - Turn your Lens into a Telescope. EF 300/4L lens with right angle eyepiece adapter. You've probably heard of "Digiscoping", which is using a digital camera with a telescope rather than using a telephoto lens. 1296 EME AND THE GALILEO SATELLITES The Galileo Satellite constellation and 1296 EME operation. When I'm operating on 1296 EME I run two receive systems. One is a 144-1296 Mhz transverter coupled to a Yaesu FT-897 transceiver. TELECONVERTERS (MULTIPLIERS) However, look at the image on the left, which is the same target shot with the EF75-300/4-5.6IS lens set to 189mm (135 x 1.4) at f5.6. PRO OPTICS 500MM F6.3 MIRROR LENS Pro Optics 500mm f6.3 Mirror lens - A hands-on review. Long telephoto lenses present a dilemma for most photographers. There are long lenses, there are fast lenses, there are cheap lenses and there are sharp lenses, but you will never find a lens with all four characteristics so you have to compromise on one or more of them. Q65- LONGER PERIOD OR AVERAGE? Q65 - When to switch to a longer period. Note: This article uses examples of signals which are characteristic of 1296 EME.Thugh the general conclusions apply to all bands, the submodes simulated are those which would be used for signals with the Doppler spreading foundon that band.
CANON EOS LENS ADAPTERS Using Manual Focus Lenses on Canon EOS bodies. Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focus. A common question from Canon EOS owners is whether older manual focus lenses from other manufacturers can be used with a CanonEOS body.
CANON EF 70-300/4-5.6IS USM LENS REVIEW Canon EF 70-300mm f/4-5.6 IS USM Review. The is the replacement for the EF75-300/4-5.6 IS USM, but the difference is much more than just 5mm at the short end of the range. According to Canon, the new lens uses a low dispersion optical element for better image quality, digitally optimized coatings to lower flare, an improved IS system giving an extra stop of "handholdability" and a panning mode CANON FD TO EOS LENS ADAPTERS Canon FD to EOS lens adapters. When Canon introduced their new EOS line of autofocus cameras in 1988 they did something that no other manufacturer had done.MIRROR LENSES
Mirror Lenses - how good? Tamron 500/8 SP vs Canon 500/4.5L. Inspired by Herbert Keppler's praise of 500/8 mirror lenses in the August 2003 issue of "Popular Photography" I thought I'd dig my old Tamron 500/8 mirror lens out of the closet and test its performance against a Canon EF500/4.5 using an EOS 10D 6MP digital DSLR. BOBATKINS.COM: Providing news, reviews, technical information and advice on photography since 1996 PHOTOGRAPHY Welcome to BOBATKINS.COM. You're most likely to be here looking for information on PHOTOGRAPHY, in which case you really want www.bobatkins.com/photography . You'll find information on cameras, lenses, digital technology as well as equipment reviews and information on the Canon EOS system. I don't cover smartphone photography much, but for less than the cost of a many smartphones you can get a real SLR with a zoom lens!AMATEUR RADIO
It's also possible you're looking for amateur radio information in which case you really want www.bobatkins.com/radio/ . There's information on VHF/UHF and microwave technology, including EME operation from KA1GT.OTHER LINKS
* Acadia Photography* Scooter Focus
* RX3 Adventure
* LensPlay
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