Search found 209 matches

by davedybas
Thu Sep 12, 2013 8:20 pm
Forum: AM Radio
Topic: AM Ground System in Asphalt
Replies: 9
Views: 2543

Re: AM Ground System in Asphalt

The ground system will be laid in the ground about 6" deep, in the conventional manner. The asphalt would be put on top of the ground system to cover it and make it difficult to pull up. From what I've read elsewhere, the asphalt attenuation is nearly zero....
by davedybas
Tue Sep 10, 2013 3:19 pm
Forum: AM Radio
Topic: AM Ground System in Asphalt
Replies: 9
Views: 2543

AM Ground System in Asphalt

Has anyone had experience with an AM Ground System being covered with asphalt, or installed into existing asphalt ? I'm curious about any attenuation the asphalt may cause to the signal. Copper thieves have forced us to consider this approach to prevent future theft of the ground system copper. Any ...
by davedybas
Mon Jun 10, 2013 7:49 pm
Forum: AM Radio
Topic: Credit where credit is due dept: Potomac Instruments
Replies: 6
Views: 1600

Re: Credit where credit is due dept: Potomac Instruments

Last January I sent a FIM-41 in and when all was said and done the cost was nearly the same as your Quote... they didn't explain all that they did, but the unit seems solid.

Dybas
by davedybas
Tue Feb 19, 2013 10:02 am
Forum: AM Radio
Topic: Under drive in SX-1
Replies: 2
Views: 1093

Re: Under drive in SX-1

I've replaced the PDM Caps but haven't replaced anything in the IPA yet....Hmmmmm...any other thoughts
by davedybas
Mon Feb 18, 2013 6:48 pm
Forum: AM Radio
Topic: Under drive in SX-1
Replies: 2
Views: 1093

Under drive in SX-1

Has anyone had intimate experience with an SX-1 ? (giggidy) I've got one in New York that is spitting out "Underdrive" alarms and blowing MOSFETs quite frequently. I'm not sure where to start on this problem. The rig has new PDM Caps, which I know often fail with age....maybe something else is agein...
by davedybas
Fri Feb 01, 2013 12:49 pm
Forum: Ask the Engineers
Topic: IP Codec
Replies: 12
Views: 2911

Re: IP Codec

The Barix 1000 units I've worked with are OK for short term use but they lack reliability for use as a permanent STL. I must admit I haven't used their "Reflector Service", maybe it provides the extra bit of "magic" to increase the reliability of an IP Barix connection. For nailed up, low budget use...
by davedybas
Tue Jan 15, 2013 8:52 pm
Forum: AM Radio
Topic: AM Broadcast Carrier Spectrum
Replies: 11
Views: 2238

Re: AM Broadcast Carrier Spectrum

On second glance I see you're using 500Hz per division resolution...typically we use 5Khz per division and in some situations 20Khz per division.... After trying to count the little bittie "ticks" between each division...it kinda looks like you may be seeing the high pass audio filters in action. As...
by davedybas
Tue Jan 15, 2013 8:43 pm
Forum: AM Radio
Topic: AM Broadcast Carrier Spectrum
Replies: 11
Views: 2238

Re: AM Broadcast Carrier Spectrum

I've done NRSC Measurements over the years and never seen a display like yours on an AM station. There appears to be a "gap" between the carrier and the audio....without knowing the resolution of the display, db per vertical division, span per division etc...it's a bit hard to even strike a guess.
by davedybas
Sun Jan 13, 2013 4:27 am
Forum: AM Radio
Topic: Looking for C-QuAM gear
Replies: 58
Views: 8091

Re: Looking for C-QuAM gear

Most people listen to AM when they're in the car, so the need is for good car radios rather than rack mounted in house radios.
by davedybas
Mon Jan 07, 2013 2:37 pm
Forum: Everything else
Topic: SBE CertPreview Downloads
Replies: 2
Views: 1795

Re: SBE CertPreview Downloads

I was able to get things working with the help of the folks at the SBE. Evidently I still had something from the old CertPreview software on my PC and that kept the new software from loading. I installed a fresh copy of the Old Software, which they provided and all is good now !
by davedybas
Fri Dec 28, 2012 8:11 pm
Forum: Ask the Engineers
Topic: What are the xylophone-like tones on AM dial?
Replies: 11
Views: 1972

Re: What are the xylophone-like tones on AM dial?

I heard some weird tones on my AM radio years ago...turned out to be my son's PC in the next room generating a bit of RF.
by davedybas
Mon Nov 26, 2012 7:57 pm
Forum: AM Radio
Topic: WBAL Experimental Permit
Replies: 23
Views: 4541

Re: WBAL Experimental Permit

Could this be the "all digital" experimental station ?
by davedybas
Fri Nov 23, 2012 9:29 am
Forum: AM Radio
Topic: center fed antenna
Replies: 14
Views: 2413

Re: center fed antenna

"Can't we all just get along?"
by davedybas
Tue Nov 20, 2012 10:19 am
Forum: Everything else
Topic: SBE CertPreview Downloads
Replies: 2
Views: 1795

SBE CertPreview Downloads

Has anyone had problems with the downloaded version of the SBE CertPreview software ? I've purchased a test preview via download from a link that the SBE sent me. The software installs fine but when I try to register my new Test Preview purchase it tells me the "user not found". I've installed - reb...
by davedybas
Sun Oct 14, 2012 5:21 pm
Forum: AM Radio
Topic: Cell towers and Non-Directional AMs
Replies: 10
Views: 1824

Re: Cell towers and Non-Directional AMs

Up until recently only Cellular Service Towers required AM Staton Notification & Protection. Tollway Service, Police and other Civil service Towers were left out of the requirement possibly as an oversight...but not anymore....though I still have to check for the updated ruling.

Dave Dybas