From: George Herold on 6 Sep 2009 19:16 On Sep 5, 8:49 am, John Larkin <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > On Sat, 5 Sep 2009 00:59:51 -0700 (PDT), Richard Henry > > > > > > <pomer...(a)hotmail.com> wrote: > >On Aug 31, 6:38 pm, George Herold <ggher...(a)gmail.com> wrote: > >> A recent discussion on SEDhttp://groups.google.com/group/alt.electronics/browse_thread/thread/6... > > >> Posted the following link to the MIT rad. lab series.http://www.jlab.org/ir/MITSeries.html > > >> Ive read none of these, and I figure its time to lay in some reading > >> material for those long winter nights that are coming shortly. > > >> Ive ordered a copy of Volume 8 from the web. (I like Dicke and > >> Purcell.) And Im looking for other recommendations. (Volume 15 > >> Crystal rectifiers was referred to in the above SED thread.) Any > >> other gems? > > >> George H. > > >I have picked up a couple of volumes at swap meets and garage sales. I > >am always looking for more in used book stores. At one time, I saw an > >entire set, practically unopened as far as I could tell, in a > >reference bookshelf of a US Navy electronics school. > > >I also look for older versions of Bowditch's Navigator, which is used > >as a text at Annapolis, and which gets updates every few years to keep > >up with the newer equipment. And I stumbled into a complete set of > >the US Army's official history of WWII. Unfortunately, it was in > >Lawton, OK, so I only bought one volume to take home in my luggage. > > You can still buy entire RadLab sets, ballpark $3000 for one in prime > condition. I have them all, collected over the years, but a motley > collection of conditions and a few of the smaller, grey-cover > versions. Fascinating anyhow. I read them all when I was a summer > worker at LSUNO (microwave spectroscopy, 80 cents an hour) where they > had the whole set in the library. > > I went to a couple of used-book stores in Cambridge, a 5 minute walk > from the original RadLab, and they'd never heard of it. Try Amazon or > ebay. > > Morison's official history of the US Navy in WWII can be had in prime > condition, 15 vols, affordable. A good, long read. > > John- Hide quoted text - > > - Show quoted text - I've found some volume's for less than $10 delivered. $3k sounds like too much for all 28. George H.
From: Paul Keinanen on 7 Sep 2009 00:20 On Sun, 06 Sep 2009 18:50:14 -0400, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >John Larkin wrote: >> On Fri, 04 Sep 2009 14:50:45 -0400, Phil Hobbs >> <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >> >> >>>> V1, fig 1.3, is very cool. >>>> >>>> John >>>> >>> Doesn't come out well in the scan, unfortunately. >>> >>> Cheers >>> >>> Phil Hobbs >> >> ftp://jjlarkin.lmi.net/MoonBounce.JPG >> >> John >> > >Cute, thanks. I'm sort of surprised that the echo is that wide--it >ought to be dying off in less than 10 ms, compared with a total delay of >2.5 seconds. From the picture, it is hard to determine the transmitter pulse width as well as the receiver bandwidth. However, the two narrow pulses at left are quite likely due to some leakage from the transmitter rising and falling edge of the transmitting pulse (possibly as an effect of Rx/Tx switching and some AGC effects on the overloading). A receiver bandwidth of only a few Hertz would be used to detect such pulses, would broaden the received pulse. The received pulse contains some amplitude variations, which is due to libration fading (constant multipath fading due to constant doppler phase shifts from different regions of the Moon). Such libration fading can be quite severe, which is quite evident in some amateur radio EME (Earth-Moon-Earth) communication recordings of individual Morse code dot or dash in which the amplitude fluctuates violently. Paul
From: JosephKK on 7 Sep 2009 12:37
On Sat, 5 Sep 2009 00:59:51 -0700 (PDT), Richard Henry <pomerado(a)hotmail.com> wrote: >On Aug 31, 6:38 pm, George Herold <ggher...(a)gmail.com> wrote: >> A recent discussion on SEDhttp://groups.google.com/group/alt.electronics/browse_thread/thread/6.... >> >> Posted the following link to the MIT rad. lab series.http://www.jlab.org/ir/MITSeries.html >> >> Ive read none of these, and I figure its time to lay in some reading >> material for those long winter nights that are coming shortly. >> >> Ive ordered a copy of Volume 8 from the web. (I like Dicke and >> Purcell.) And Im looking for other recommendations. (Volume 15 >> Crystal rectifiers was referred to in the above SED thread.) Any >> other gems? >> >> George H. > >I have picked up a couple of volumes at swap meets and garage sales. I >am always looking for more in used book stores. At one time, I saw an >entire set, practically unopened as far as I could tell, in a >reference bookshelf of a US Navy electronics school. > >I also look for older versions of Bowditch's Navigator, which is used >as a text at Annapolis, and which gets updates every few years to keep >up with the newer equipment. And I stumbled into a complete set of >the US Army's official history of WWII. Unfortunately, it was in >Lawton, OK, so I only bought one volume to take home in my luggage. > > I am not sure what to say to you. I have very split feelings on this. On one hand i am glad that you recognized the value of the document to see to the preservation of even a little bit for a few more years. On the other hand it tics me off that you busted up a complete set. |