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Archive for the ‘Uncategorized’ Category:
2018-10-07 Air Band Radio Kit HMOOABRA_4.3 Part 3
From FB group Building Transistor Radios comment 2018-10-07 Bob Johansen I don’t have a way of calibrating an RF signal level. Back when I worked on Aircraft radios we had General Radio VHF signal generators, attenuators and RF signal strength meters and a Panoramic spectrum analyzer. This would have been a piece of cake to
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2018-10-06 Air Band Radio Kit HMOOABRA_4.3 Part 2
Posted to FB group Building Transistor Radios 2018-10-06 First part is here. I noticed that my photo didn’t get added to the photos tab, So I’m trying again to add it. I got a fresh start this Sat. morning. I used another little air band receiver to listen for the LO from this one. I
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2018-09-11 Vectronics Aircraft Radio Kit
I got the Vectronics VEC-131K aircraft band radio kit in the mail yesterday and warmed up the soldering iron to assemble it. It came at a decent price, so some of my complaints seem to be cost cutting measures. It comes with a decent assembly instruction manual, but some of the pages including the schematic
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2018-08-27
From FB group Building Transistor Radios 2018-08-27 Michael Kronsteiner I would say that germanium transistors could not handle “high” currents because the designers were unwilling to use anything more than the cheapest germanium transistors that could barely do the job. In the 1960s there was the Workman “99 Power” that was in the TO-3 diamond
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2018-08-16 Cancer Loves Fat Cells
Sci Am article https://www.scientificamerican.com/custom-media/cancers-hidden-helper-your-fat/?utm_medium=Display&utm_source=1865911&utm_term=226398931&utm_content=101129235&utm_campaign=20582999
2018-07-25 How Stable Are Regen Reflex Radios?
From the FB group Building Transistor Radios Regenerative / reflex designs are not as stable as superheterodyne radios. One problem is the design depends on factors that are not predictable such as gain and feedback, which are not linear. The regenerative reflex depends on the circuit being on the verge of oscillation, which is not
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2018-07-22 Newspaper Delivery
From FB group 50s-60s Compton John MacBride Yeah, people don’t realize that the newspapers worked 24 hours, and all the delivery took place at night and early morning. There were neighbors a few houses down that never seemed to have jobs, I think their last name was Humberger. I found out that the L.B. Press
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2018-07-09 Country Going To Hell In A Handbasket
From FB group Orange Talk Jul 11 Rebecca Joy You said “Bernie is a socialist” but there is no proof that he would change our government (he is a member of Congress!) to socialism. HC, I assume you mean Hillary, is an experienced bureaucrat who has worked within the bureaucracy, and is not guilty of
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2018-07-06 PN2222A Vs. 2N2222A etc.
From FB group Building Transistor Radios Stuart Bca The TO-18 and plastic versions use the same chip and therefore the specifications are the same, except for power dissipation and temperature derating. Both of those depend on the case, and the same holds true for the MMBT2222A in the surface mount package. The TO-18 metal case
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