N4DDP and Shack

N4DDP and Shack
N4DDP in native habitat

Friday, April 22, 2011

My HW-8 and other delights

I moved my beloved SB-104 (Heathkit) into the closet and have placed my HW-8 into the main position. Darn thing works. As so many others have commented, a DC receiver really does sound like you are closer to the RF itself. No mushiness, just "crisp" signals. I suppose it is the group delay in the if filter and the myriad of other devices the signal must get through in the Yeasu,  the HW-8 is more  pleasant to listen to. . . until the QRM picks up, then I miss the 400 hz filter on the SB104.
My bitx also has a crisp and clear quality to the sound, maybe it is not group delay in the filter, but AGC that gives the mushiness? Perhaps it goes back to the fewer the stages, the less distortion that gets added.

Still trying to figure out how to multi-band the palm-tree so I can get on 40 and 10. . . I am still pondering putting a 40 loop on the roof and if it is too noisy (QRN) use the vertical for receive and the loop to txmit on. Got the PA and filter board laid out for the Bitx, when I etch and stuff it, I should be close to actually using the darn thing.

Still trying to work a QSO a night, haven't gotten far with that, although I have been getting some practice in on the keyer, I may be ready next time I get into a QSO.

Oh, here's a story: When I was building my power meter, I used a LM324 (quad op amp) for only one amplifier (what I knew I had on hand.) Brilliant self, I used a TSSOP instead of the SOIC package I had on had. No problem, I only need the first four pins and ground.  . . only my LM324s had 16 pins instead of 14! After I looked at the data sheet, I looked at the part numbers on the chips and figured out that Digi-key sent me the wrong parts 18 months ago! So I designed my board for a chip I never had! I will just use some TL084 (still SOIC.)
That's all for now.

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