Month: January 2011

A Blast from the Past: THE HAMMARLUND HQ-100

I’m sitting here in the shack at 0645 EST on the first Sunday morning in 2011. Coffee is on. And so is my OLD Hammarlund HQ-100. I have it tuned to a friendly AM roundtable on 75 meters. And it sounds GREAT. Nothing like a receiver that is as broad as a barn door to let you appreciate that great AM sound.

This receiver and I have some history. I bought it in the Dominican Republic, probably in 1993, probably from my friend (now SK) Pericles Perdomo. It had suffered the ravages of the Dominican radio environment from both ends: I think I found signs of a lightning surge at the front end, and of a power surge at the AC input. The audio output transformer was bad also. This was one of my first tube-type renovation project. I had a lot of fun with it.

There are no crystal filters in this receiver. If you want to narrow it down, there is a Q-multiplier (so –yikes!– this receiver is at least in part a regen). In its original configuration the Q multiplier doubled at the BFO, but I guess my anti-regen feelings were at work even then: I took the 100 kc crystal calibrator and put a 453.5 kc crystal in there — so that calibrator now serves as the BFO. This seems much more civilized.

You can see in the picture that the clock is gone. Mine was in pretty sad shape when I got it. Plus I thought it looked kind of goofy in that otherwise very beautiful front panel. So I took the clock out, patched the hole, and gave the clock to a very grateful Hammarlund collector.

The AM really sounds great. I can see that I’m going to need a 75 meter dipole so I can match this receiver up with my DX-60 VF-1 combo.

If You Could SEE The Night Sky at Radio Frequencies

Image courtesy of NRAO/AUI

SolderSmoke is mainly about radio, but we make frequent detours into astronomy. The picture above nicely combines the two fields. This is what the night sky would look like if our eyes received at radio frequencies! Here’s how the National Radio Astronomy Observatory describes their image:

This composite picture shows the radio sky above an optical photograph of the NRAO site in Green Bank, WV. The former 300 Foot Telescope (the large dish standing between the three 85 foot interferometer telescopes and the 140 Foot Telescope) made the 4.85 GHz radio image, which is about 45 degrees wide. Increasing radio brightness is indicated by lighter shades to indicate how the sky would appear to someone with a “radio eye” 300 feet in diameter. The optical and radio skies reveal “parallel universes” containing quite different objects. The extended radio sources concentrated in a band from the lower left to upper right lie in the outer Milky Way. The brightest irregular sources are clouds of hydrogen ionized by luminous stars. Such stars quickly exhaust their nuclear fuel, collapse, and explode as supernovae, whose remnants appear as faint radio rings. Unlike the nearby (less than 1000 light years distant) stars visible to the human eye, almost none of the myriad radio “stars” scattered over the sky are really stars at all. Most are luminous radio galaxies or quasars, and their average distance is over 5,000,000,000 light-years. Radio waves travel at the speed of light, so distant extragalactic sources appear today as they actually were billions of years ago. Radio galaxies and quasars are beacons of information about galaxies and their environs, everywhere in the observable universe, ever since galaxies first formed. Investigator(s): J. J. Condon, J. J. Broderick, and G. A. Seielstad

Higher definition images and lots more info is available here:
http://images.nrao.edu/Miscellaneous/Surveys/321 Three cheers for the NRAO!

So… Think BIG in 2011! Happy New Year and 73 to all!