开云体育

I used to have that information in my head...... The round meter ones are the last production of the HT9. The square meter HT9's were the first production runs.? Look at some of the internal parts

I have a 4 digit serial number around 4500. It’s got a black cabinet and has round Hallicrafters marked meters recessed in the front panel. Any wild guess on what year this transmitter was made?

Following items are for sale. Heathkit AT-1 Transmitter with AC1 Tuner $85 + shipping Hallicrafters S-107 5 Band Shortwave Receiver $70 + shipping (reduced price) Please click the link below and read

Hi Paul, Thank you for your kind words of support and encouragement. I'm not too far behind you. I've been hamming for 58 years, started in high school in Sept 1966. I'm retired now and spend a lot of

Hi Mike. I'm Paul, K2LMQ in Kingman, AZ. Still on the air after 69 years of hamming. Just saw your project listing and wanted to tell you how impressed I am with your thoroughnes in every respect! All

I have the following items up for sale. Heathkit AT-1 Transmitter with AC1 Tuner $85 + shipping Hallicrafters S-107 5 Band Shortwave Receiver $75 + shipping Please click the link below and read the

To all the fans of the SR-160 and the SR-500. I have upgraded the "DRIVER & PA OPTOMIZATION" document on my website. I have added more information and rewritten it to be more friendly to the new,

Hi Don, Thanks for doing the computational analysis I was too lazy (and unskilled) to do!? It seems we reached similar conclusions and we're both learning the fun way about how power transformers

Halden your writings in black, my comments in green The peak current amplitude fell a little bit (750-650 mApp) but the shoulder amplitude rose substantially (500 vs 200 mApp). --yes- The phase lag

Now that the repair of the radio is complete I can post an update. I worked through the remaining IF and RF stages replacing waxies and resistors that had gone substantially high. After component

Halden good that the HV T-T seems ok to your eye. To my eye #16 looks like magnetizing current only. I have wondered about letting it run for some hours while your nose is not to far away. One thing I

Hi Don, I agree that the shorted turn's resistance was limited by the resistance of the contact between the wires.? I noticed that when I squeezed the wires together with pliers, the current went up

Halden, revised? oops this very draft post somehow flew off the table ?too soon, I never learn ! some parts were to be revised or deleted, and others added I am leaving the original as just sent?

Halden, Jim, now a bit late.. Measuring values on a scope can easily return a peak value, and depending on how you measure, P-P might be more accurate. I certainly never managed to see an RMS or

Hi Don, Yes, both the voltage and current are measured at the transformer's primary.? The voltage does not include the voltage across the dim bulb.? A transformer transforms voltage according to the

Halden, I will bypass most of your writings for now and just say the first img {16} looks as expected. The second img {20} with the shorted turn has a current waveform as expected, but it is strange

HaldenI don't understand why you need peak to peak values.? The average voltage or current in a full cycle of AC is zero.? That is why only the peak of half cycles of voltage and current and their

Hi Jim, I stated quantities in peak-to-peak units.? That's what the little "pp" in mApp means.? It's more commonly used to represent a voltage: Vpp denoting peak-to-peak volts is probably more

I applaud your dedication in trying to understand what is going on with the HT-37 transformer but I am not sure about your conclusions.??The current per division in the first figure is 0.2 amps per

Hi Don, Yep, I concur that the hole was caused by decomposition of the insulating material due to the arcing that occurred at the site.? The Kapton I intend to use was new 10 or 20 years ago, and