Power Supply?
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I sure Elecraft can answer this better. I would make a guess that
power supplies in much equipment is bought from a vendor and installed as a module; the vendor having taken care of all necessary certifications. Perhaps in high volume production the PS is ordered to the manufacturers spec but supplied by a vendor the makes power supplies. The Basecom20 is sold by Motorola but it is identical to the Astron R20. My guess Motorola contracts Astron to manufacture the power supply re-labled for Motorola to sell. When I was making custom equipment I didn't build the power supply as it was cheaper to buy something off-shelf at wholesale. 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? DUBUS Magazine USA Rep [hidden email] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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All,
Please be advised that Astron supplies are generally over rated. The RS-20 is rated at 20A peak and 16A continuous. It is more like 12 -14 continuous. I have seen people try to use them at their "continuous" ratings, only to have them fail. The heat sinking is just not there. Be careful when using any of the supplies at their top ratings. If you need to use one at rated, then put a good fan on the heat sink. 73 K1NR On Sun, 03 Jul 2011 00:17:46 -0800 "Edward R. Cole" <[hidden email]> wrote: > I sure Elecraft can answer this better. I would make a > guess that > power supplies in much equipment is bought from a vendor > and > installed as a module; the vendor having taken care of > all necessary > certifications. Perhaps in high volume production the PS > is ordered > to the manufacturers spec but supplied by a vendor the > makes power supplies. > > The Basecom20 is sold by Motorola but it is identical to > the Astron > R20. My guess Motorola contracts Astron to manufacture > the power > supply re-labled for Motorola to sell. > > When I was making custom equipment I didn't build the > power supply as > it was cheaper to buy something off-shelf at wholesale. > > > 73, Ed - KL7UW, WD2XSH/45 > ====================================== > BP40IQ 500 KHz - 10-GHz www.kl7uw.com > EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? > DUBUS Magazine USA Rep [hidden email] > ====================================== > > > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: > http://www.qsl.net/donate.html --------------------------------------------------------------------- Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.com/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I have an RS-20 but use an RS-35M dedicated to my K3. I have it and my
SteppIR controller plugged into an APC 700VA UPS (from http://www.refurbups.com/ ) to prevent loss of AC power from adversely affecting the radio. I leave both the UPS and RS-35M on and turn off the K3 with the front panel switch. Both are on a shelf under the table. Jim N7US -----Original Message----- All, Please be advised that Astron supplies are generally over rated. The RS-20 is rated at 20A peak and 16A continuous. It is more like 12 -14 continuous. I have seen people try to use them at their "continuous" ratings, only to have them fail. The heat sinking is just not there. Be careful when using any of the supplies at their top ratings. If you need to use one at rated, then put a good fan on the heat sink. 73 K1NR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Jim,
I use my own custom UPS... and Astron SS30M with a Powergate PG40S tied to a Marine GSM battery at 200 amp. I can lose power for quite a while and still operate. I think this is less costly than a dedicated UPS to handle the full load for even a short period. I do have an APS UPS for the PC's printers, routers and AP's. 73, Bill K9YEQ -----Original Message----- I have an RS-20 but use an RS-35M dedicated to my K3. I have it and my SteppIR controller plugged into an APC 700VA UPS (from http://www.refurbups.com/ ) to prevent loss of AC power from adversely affecting the radio. I leave both the UPS and RS-35M on and turn off the K3 with the front panel switch. Both are on a shelf under the table. Jim N7US ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Eugene Balinski
Another example of "reading the manual" or in this case the "info sheet".
I have run Basecom20 for a 50w VHF-FM radio for up to ten years onboard 200-foot oil field work boats. I did have one "croak" but that might have been due to the highly regulated (joke) ships generator: 115vac +/- 50vac! Ten years in continuous duty is not bad. These look to be re-labeled Astron RS-20 PS and have been supplying multiple radios on a boats. 250w => 18 amps. A 150w marine SSB will have a dc load of about 250w. I use a 50A Tait PS (14.1 vdc) to power my home station 12volt needs. The No. 6 welding wire supply line is fused at 30A at the radio table distribution point. Been in service for about 9 years. This is a re-labeled Astron VM-50. So, yes, I derate them about 60% for long-term service. Ed - KL7UW At 06:16 AM 7/3/2011, Eugene Balinski wrote: >All, > > Please be advised that Astron supplies are generally >over rated. The RS-20 is rated at 20A peak and 16A >continuous. It is more like 12 -14 continuous. I have >seen people try to use them at their "continuous" ratings, >only to have them fail. The heat sinking is just not >there. Be careful when using any of the supplies at their >top ratings. If you need to use one at rated, then put a >good fan on the heat sink. > > >73 >K1NR > > > >On Sun, 03 Jul 2011 00:17:46 -0800 > "Edward R. Cole" <[hidden email]> wrote: > > I sure Elecraft can answer this better. I would make a > > guess that > > power supplies in much equipment is bought from a vendor > > and > > installed as a module; the vendor having taken care of > > all necessary > > certifications. Perhaps in high volume production the PS > > is ordered > > to the manufacturers spec but supplied by a vendor the > > makes power supplies. > > > > The Basecom20 is sold by Motorola but it is identical to > > the Astron > > R20. My guess Motorola contracts Astron to manufacture > > the power > > supply re-labled for Motorola to sell. > > > > When I was making custom equipment I didn't build the > > power supply as > > it was cheaper to buy something off-shelf at wholesale. > > > > > > 73, Ed - KL7UW, WD2XSH/45 > > ====================================== > > BP40IQ 500 KHz - 10-GHz www.kl7uw.com > > EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? > > DUBUS Magazine USA Rep [hidden email] > > ====================================== > > > > >______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[hidden email] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: > > http://www.qsl.net/donate.html > >--------------------------------------------------------------------- >Web mail provided by NuNet, Inc. The Premier National provider. >http://www.nni.com/ 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-? DUBUS Magazine USA Rep [hidden email] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bill K9YEQ
On 7/3/2011 2:09 PM, Bill K9YEQ wrote:
> I use my own custom UPS... and Astron SS30M with a Powergate PG40S tied to a > Marine GSM battery at 200 amp. Yes, I've done exactly this, but with a different battery and PSU, for about 8 years. My battery is a PAIR of the biggest deep cycle units that Costco sells (for about $75 each). They last about four years. This setup got me through Field Day with a K3 QRP for 19 hours on the air, with plenty of battery left at the end (I pulled the charger before FD started). 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Mine is in place for around 3 years. I keep the supply set at 14.1 volts
with the proper jumper on the PWRgate. 73, Bill K9YEQ -----Original Message----- Yes, I've done exactly this, but with a different battery and PSU, for about 8 years. My battery is a PAIR of the biggest deep cycle units that Costco sells (for about $75 each). They last about four years. This setup got me through Field Day with a K3 QRP for 19 hours on the air, with plenty of battery left at the end (I pulled the charger before FD started). 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Edward R Cole
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I use the Powerwerx 30A switching power supply. It is switchable voltage and
takes an IEC lead, so there is no problem using it here in Australia. The 25A continuous rating is well suited to the K3 with the PA. It takes up almost no bench space and is only 3lbs. The dimensions are 6.1 x 5 x 2.5 in (154mm long, 127mm wide, 63mm tall). The powerpole connections on the front really make it easy to use with the K3. The cooling fans are off by default and it takes a lot of transmitting before they spin up. Using a UHF/VHF mobile at 10W doesn't get the fans going, but my old GME (Australian brand) switching radio PSU would fire up the fans with 5W transmit and was noisy. This PSU is pretty quiet, and will make field transport a breeze. I haven't found any extra RF interference from it (over and above a gel cell), but I live in an urban area and so the background noise is pretty bad. I don't have any relationship with the supplier, other than being a happy customer. Dave. -- David Ingram (VK4TDI) Brisbane, Queensland, Australia To avoid spam trap, send email to dave at ingramtech dot com GPG: B0731AED W: http://ingramtech.com/ MH: QG62lm On 4/07/2011 9:15, Ron D'Eau Claire wrote: > Also note that the Astron 20A rating is actually the ICS or "Intermittent > Commercial Service" rating. OTs recognize this as the former ICAS rating > when "Amateur" was included in the designation. > > IIRC, ICS is based on five minutes at full current and five minutes on > standby. > > Running SSB, CW and *some* digital modes, the actual load is much, much > less. SSB, for example, draws peak current only on voice peaks and, of > course, CW draws peak current only so long as the key is closed. > > Now, hammering out a digital mode such as RTTY at 100% power for long > transmission is a different story - and often well beyond the capabilities > of the transmitter anyway. > > Airflow and environment are important too. In commercial repeater service we > seldom crowded the specs, especially when the system was in a building full > of repeater gear where the temps around the power supply might exceed 100F > in spite of air conditioning. Even so, dozens of Astrons ran year after year > without a hitch. I cannot recall finding one dead. > > And then there's the Ham station I saw one time where the power supply was > sitting on the floor - directly on top of a heating vent! > > I've been running the home station from an Astron 20 for about 10 years now > - a K2/100 and then the K3/100. It handles either rig to full output with > current to spare. I am a 99.9% brass pounder. > > Ron AC7AC > > -----Original Message----- > > Another example of "reading the manual" or in this case the "info sheet". > > I have run Basecom20 for a 50w VHF-FM radio for up to ten years > onboard 200-foot oil field work boats. I did have one "croak" but > that might have been due to the highly regulated (joke) ships > generator: 115vac +/- 50vac! Ten years in continuous duty is not > bad. These look to be re-labeled Astron RS-20 PS and have been > supplying multiple radios on a boats. 250w => 18 amps. A 150w > marine SSB will have a dc load of about 250w. > > I use a 50A Tait PS (14.1 vdc) to power my home station 12volt > needs. The No. 6 welding wire supply line is fused at 30A at the > radio table distribution point. Been in service for about 9 > years. This is a re-labeled Astron VM-50. > > So, yes, I derate them about 60% for long-term service. > > Ed - KL7UW > > At 06:16 AM 7/3/2011, Eugene Balinski wrote: >> All, >> >> Please be advised that Astron supplies are generally >> over rated. The RS-20 is rated at 20A peak and 16A >> continuous. It is more like 12 -14 continuous. I have >> seen people try to use them at their "continuous" ratings, >> only to have them fail. The heat sinking is just not >> there. Be careful when using any of the supplies at their >> top ratings. If you need to use one at rated, then put a >> good fan on the heat sink. >> >> >> 73 >> K1NR > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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