开云体育

The screws are weird!? Back in the late '70's when a 478A head was worth $250 working (real money then!), I used to repair these. I ran a lab at Westinghouse Defense in Baltimore that did MIC work,

Hi interested in a set but the red lab books are new to me can you tell me the titles that make up the set Paul B

I have a couple of complete sets of the RadLab books. They are available for sale if any one is interested. Thanks & have a great Thanksgiving - Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ

Interesting point. I have not worked with thermistor heads since ages but I always wondered how the screws work on the HP478 and HP8478?73 de Harke

Hi Jeff good to talk to you again regarding the 478 and rebalancing the head using the screws I have found that the temperature compensation isn't as good after you have to rebalance using the

[with a grin] ...And it pains me to see an educational thread corrupted by posting a New Topic, when you meant to post a Reply... I also have several of the original RadLab books. The one titled

Really? Because HP used the same idea in the 478A & 8478A heads, they were 200 ohms series under AC bias, 50 ohms to RF, but when measured "cold" with an ohm-meter they were approx 3-4K ohms. I would

The reference is "Tuxedo Park" by Jennet Conant, a marvelous book! I use this as well as others when I talk about electrotechnology and the importance of WWII to my students.? However the facts as

Are the diode sensors for lower levels good and linear so a transfer from a 432A sensor gives a good cal on the nanowatt ranges?

Hi regarding the HP power meters HP 430 was the first of the microwave power meters its coaxial thermistor mount HP 477 10 mhz to 10 Ghz The HP 430 sold for $300 in 1967 and the HP 477

Mixing two stories. Loomis tested first Maggie in Tuxedo Park.Rad Lab was at MIT.Please review your history!? I teach this stuff and it pains me to see it corrupted. Jeff KruthTechnical Historian

Regarding the TFT Marconi power meter they had 2 thermisters at 100 ohm each And connected so that DC they added up to 200 ohm but presented a 50 to an AC signal The power sensor was

This happens to me occasionally (I buy a lot of gear from the US). In one case they told me the item can't be exported (it was a standard RAID controller that is sold all across the world). Another

Thanks for the Rad Lab link. It appears that all the volumes are available in PDF format. I'm downloading them all now. Having read a history of the Rad Lab and a biography of the man responsible,

Battery fitted inside equipment is exempt David Sent: 22 November 2018 12:58 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Warning to buy equipment

Ahh the GSP "police" There are two main reasons why GSP may say something is restricted 1/ it's hazardous to ship e.g. batteries chemicals. The rules on batteries are complex, but a internally

Someone I know had a lithium ion battery distroyed. The seller should never have shipped such an item in the first place, and the seller lost his money. It seems the GSP was kind to the seller in

I just bought a HP 8593E on ebay. It was going through the Global Shipping Programme (GSP). For no good reason they said it is restricted unit and it cannot be exported to Denmark. The seller will

The GM / Marconi TfT deivces are thermocouple arrays. Bismuth /nichrome couples bad as a electrical generation device but can be made to match 50R. The resistor thermocouple types were common in RF

There's a copy of the Rad Lab series on ko4bb.com: http://eww.ko4bb.com/getsimple/index.php?id=manuals&dir=03_App_Notes_-_Proceedings/RadLab_Series -- john, KE5FX