Search found 480 matches

by kcbooboo
Sat May 26, 2018 8:11 am
Forum: AM Radio
Topic: MDCL or something wrong?
Replies: 4
Views: 50

MDCL or something wrong?

While tuning around with my FIM-41, I ran across one 50kW IBOC station (supposedly all news) that showed an odd reading on my meter. During voice modulation, I got about 1.5 mV/m, however during pauses in modulation, the meter ROSE to over 2mV/m. I immediately thought this was odd and it reminded me...
by kcbooboo
Fri May 18, 2018 4:40 am
Forum: Digital Radio
Topic: Monitoring, Day Sequerra Board Repair
Replies: 7
Views: 159

Re: Monitoring, Day Sequerra Board Repair

I suppose the M2 is better than nothing, but its accuracy was far from what you'd need to assure FCC compliance. I wonder what the FCC uses, by the way, when they investigate overmodulation complaints? There was one pirate station in my town a few years ago that was running 40 kHz deviation on their...
by kcbooboo
Thu May 17, 2018 5:16 am
Forum: Digital Radio
Topic: Monitoring, Day Sequerra Board Repair
Replies: 7
Views: 159

Re: Monitoring, Day Sequerra Board Repair

I owned one of those units for a couple of months. The blue LEDs were bright enough to light up my entire house! Unfortunately even after a trip to the factory to be updated and calibrated, the unit still didn't perform up to my requirements and I refused to send it to them for another month. The qu...
by kcbooboo
Sun Apr 29, 2018 8:13 am
Forum: Ask the Engineers
Topic: Temperature Sensor for Remote Control
Replies: 4
Views: 165

Re: Temperature Sensor for Remote Control

That simple circuit is fine for indoor use, but if you need to go below freezing, you need an alternate circuit that biases the LM34 upward by about two diodes-worth. That'll give you temps from -50F up to over 200F. You can also use a small wall-wart DC supply rather than the battery. In fact, does...
by kcbooboo
Sun Apr 29, 2018 8:10 am
Forum: AM Radio
Topic: GatesAir suspends AM TX sales (Radio World)
Replies: 33
Views: 1093

Re: GatesAir suspends AM TX sales (Radio World)

I think the big Collins MW TX at the VOA/Bethany station was vapor cooled. Unfortunately that entire site (some 600+ acres) was taken out of service sometime in the 1990s and they put condos on the ground. I heard they moved the TX to a museum and were trying to get it going again. I bet the copper ...
by kcbooboo
Thu Apr 26, 2018 5:28 am
Forum: Ask the Engineers
Topic: Realistic Service Manual Request
Replies: 7
Views: 155

Re: Realistic Service Manual Request

And it doesn't help that their support web site (support.radioshack.com) is not responding.

Bob M.
by kcbooboo
Tue Apr 10, 2018 2:46 am
Forum: FM Radio
Topic: FM3.5 odd problem
Replies: 9
Views: 339

Re: FM3.5 odd problem

I'm not familiar with the FM3.5, but if it's running on 3-phase AC power, perhaps one of the phases is dropping out. I had a similar problem with a Continental 20kw 816R2 that uses SCRs in the xfmr primary to regulate the HV. Turns out a 3PDT 24V relay was bad and it was intermittently dropping the ...
by kcbooboo
Sun Mar 25, 2018 6:00 am
Forum: AM Radio
Topic: Dealing with mixing products
Replies: 10
Views: 1360

Re: Dealing with mixing products

It just seems that two series LC circuits in parallel, with only a 1kw power capacity, shouldn't take up a full rack cabinet's worth of space. To be fair, the phasor at the 1kw station is quite small; it takes up one rack width and is maybe a few feet tall, about the same size as the AM1A tx. I'm gu...
by kcbooboo
Sat Mar 24, 2018 8:09 am
Forum: AM Radio
Topic: Dealing with mixing products
Replies: 10
Views: 1360

Re: Dealing with mixing products

I didn't do the EPM spectrums for one station in 2016 but I was asked to do it in 2017. Both are running B-E transmitters, the one producing the mixing is only 1kw directional full-time. I looked hard to find the mixing sum but it just wasn't there. The carrier was 320mV/m which is certainly healthy...
by kcbooboo
Sat Mar 17, 2018 6:20 am
Forum: Everything else
Topic: RadioWorld Magazine
Replies: 18
Views: 483

Re: RadioWorld Magazine

Mark: Perhaps your subscription, like mine, finally expired. Email Kwentin K. Keenan, Circulation Manager, NewBay: kkeenan [ at ] nbmedia [ dot ] com and let her know. She sent me a link to a personalized subscription screen that I just had to answer some questions on, and after that she sent me lin...
by kcbooboo
Fri Mar 16, 2018 6:35 am
Forum: Administrator Announcements
Topic: SSL Certificate
Replies: 21
Views: 794

Re: SSL Certificate

According to the current Opera downloads requirements, Windows 7 and higher, just like everybody else. It MAY have worked with WinXP at one time and there MAY still be a version one could download that supports it, but their download server or gateway is currently inoperative so I couldn't get to th...
by kcbooboo
Fri Mar 16, 2018 6:13 am
Forum: Everything else
Topic: RadioWorld Magazine
Replies: 18
Views: 483

Re: RadioWorld Magazine

I never even knew there was an "Author's Page". Maybe I've just never fully perused the older web site. At times it was so cluttered I'd close my eyes and just click on the menu item I wanted to see, and could easily get to the article that interested me. The new site seems to be aimed solidly at th...
by kcbooboo
Thu Mar 15, 2018 5:44 am
Forum: Everything else
Topic: RadioWorld Magazine
Replies: 18
Views: 483

Re: RadioWorld Magazine

"The new phone books are here! The new phone books are here!" (from Steve Martin's "The Jerk") I actually got an email from the circulation/subscription person yesterday with a link to the March 14 2018 issue of RW. Paul McLane said they're slowly putting content back on the site. How far back is un...
by kcbooboo
Thu Mar 15, 2018 5:33 am
Forum: Administrator Announcements
Topic: SSL Certificate
Replies: 21
Views: 794

Re: SSL Certificate

Now, does Opera work under WinXP? Since I'm still in the stone age (and enjoying all the programs that work in XP without aggravation), that's an obvious requirement.

Bob M.
by kcbooboo
Wed Mar 14, 2018 5:43 am
Forum: Administrator Announcements
Topic: SSL Certificate
Replies: 21
Views: 794

Re: SSL Certificate

"Do you mean that it lost the http:// info? That should still be accessible under Tools|Options|Security|Saved Logins." I think the issue was that the previously saved username/password was for the http:// URL, and since the https:// URL is not identical, Firefox couldn't auto-fill the username/pass...