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Wow, for a minute there I thought that was a Radio Shack 21-1173 mic: The head style is different and the Radio Shack mic probably has a 5-pin DIN plug on it, but still. -Bill

To give you a set of real world numbers: The radio I have, a Kenwood TS-950SDX, is rated for 150 watts PEP. That means that at any given moment, the transmitter can not exceed 150 watts of output. I can hit 150 watts briefly during a voice peak while transmitting, or I can turn the mic gain...

That's good, because your memory was in such dire need of a refresh that you forgot to tell us what radio you have. :) -Bill, unit248

Damn. I have yet to work Antarctica from my QTH in San Francisco. Farthest south I've gotten is the Falkland Islands (on 20 meters). Both 10 and 12 meters were really open this weekend. I worked Italy, Germany, the Netherlands, Spain, Ireland, the UK, Serbia, Croatia, Russia, Hungary, Guam...

Brad has upgraded -- he recently acquired a Voodoo-modified Kenwood TS-950SDX to go with the TS-850/DSP-100 combo. Unfortunately the last few times I caught him on the air, I was having a hard time copying him, so I wasn't able to really appreciate the sound new rig. I'm hoping maybe I can...

Of course all the best propagation happens while I'm stuck at the office. :) Wonder if it'll hold out until the weekend. -Bill

Bear in mind the TS-2000 supports multiple bands besides HF, and it may not use the same final stages for all bands (it might be a little hard to make the HF power amp work on 440Mhz.) According to the service manual, Q3 and Q4 on the final unit are HF/VHF drivers and Q6 and Q7 are HF/50Mhz...

Hm. Well, first, let me say I don't know much about cars. I think there are two possible scenarios where. The idle air control valve is electrically controlled, so it obviously has some kind of motor or solenoid on it to actuate it. But that actuator is also controlled by some other system in...

I've owned a Kenwood TH-F6A for several years. (I'm a long-time Kenwood fanatic; I've got 3 Kenoowd HF rigs to go with the HT). It's a nice little radio and I've never had any problems with it. I also got the hand-mic, SMA to SO-239 adapter and the computer interface cable. One thing I wanted...

It is possible for the internal speaker itself to be damaged -- maybe the cone is torn or the magnet inside is cracked. However it's also possible it's just come unplugged. Some radios have the speaker wires soldered at both ends (my cheap Chinese-made Cobra 148GTL is like that), but a lot of...

Not quite. The TS-690 is a TS-450 with 6 meters. The TS-680 is a TS-140 with six meters. Kenwood TS-690S, Kenwood ts690s Kenwood TS-680S, Kenwood TS-680 Transceiver As for the TS-450, it's not a bad radio, but I would rather have the TS-850. (But that's largely because it's easier to...

I'm glad you figured this out. I was going to say it sounded like a problem with the RX/TX switching but since I don't know enough about the Cobra design to offer any useful hints beyond that obvious point, I decided to just save my breath until somebody smarter spoke up. Looks like someone did...

I worked them on 20 meters just the other day. Good signal out here in SF. -Bill

Nice! Although, with their higher end radios, Yaesu seems to have a pattern where the rig's model number is almost the same as its price. Hope that's not the case here. :) -Bill

I'm not positive (I don't think anyone is), but I think the AM audio CW signal on 5800Khz is related to the alleged Cuban spy numbers station on 5883Khz. Listen to 5883 around 11PM PST (daily) and you'll probably hear it: female voice announcing 5-digit number groups in Spanish in AM mode. The...

The notch filter is useful for blocking out heterodynes. If you tune in an AM signal on SSB and tune a little off frequency, you'll hear a loud single frequency tone. You can also hear this on AM when two stations key up together and they're a bit off frequency from each other (the frequency of...

Robb: like I said, it varies from rig to rig. I got curious so I looked at the TS-440 service manual schematics. It looks like the ACC2 data input line goes to J25 on the IF unit, which does bypass the mic pre-amp. (This is different from the TS-850 and TS-950SDX that I have: both have...

I'm pretty sure Crasher is talking about using the ACC2 port for audio _input_, not output. The pinout for the ACC2 port is in the TS-440S owner's manual. You can get a good copy of it here (warning: big file)...

Wow. I'll probably never have one, but still: wow. I don't think it's a real mechanical meter. They haven't used mechanical meter movements since the TS-940S. It looks like it's just a digitally created image on the main TFT display. I hope the sub receiver is fully independent. With...

A long time ago, when I was still taking digital logic classes in school, Radio Shack used to sell these DTMF touch tone decoder chips. I bought two of them. With one of them, I created a home brew 'tone squelch' box. Basically, I combined the DTMF chip with some other logic chips and a relay...