Search found 85 matches

by ai4i
Tue Aug 11, 2009 5:24 am
Forum: AM Radio
Topic: Synchronous Amplifiers
Replies: 27
Views: 4572

Re: Synchronous Amplifiers

If your station gets nailed by a co-channel, try running 4-5 hz higher or lower than the interfering station. Instead of hearing their audio floating underneath you, it will be a low rumble. This can lead to a whole new discussion. I would say to get your station right on top of the offending one. ...
by ai4i
Mon Aug 10, 2009 4:49 pm
Forum: AM Radio
Topic: WARM
Replies: 25
Views: 3725

Re: WARM

Augmentations (technically, modifications to the standard pattern) are a way to "draw in" areas of an AM directional pattern to cover anomalies the normal pattern calculation doesn't account for. Interesting, does this apply to parallelograms, too? Endfires with 90° spacing and broadsides with any ...
by ai4i
Sun Aug 09, 2009 11:36 pm
Forum: AM Radio
Topic: WARM
Replies: 25
Views: 3725

Re: WARM

NECRAT wrote: Day time has 2 Augmentations, Night time has one, and the pattern IS a slightly different.
Forgive my ignorance; I have seen this term used elsewhere but can not find it described on the web.
What are augmentations (asked sheepishly with tail between legs)? :oops:
by ai4i
Sun Aug 09, 2009 10:16 pm
Forum: AM Radio
Topic: Synchronous Amplifiers
Replies: 27
Views: 4572

Re: Synchronous Amplifiers

If you synchronize it so that one point is 100% constructive, half a wave length over it won't be. Wouldn't AM give that phasing/flanging sound? Actually, it would only be a quarter wave over, since one station would be advanced 90° while the other would be retarded the same amount. First off, I th...
by ai4i
Sat Aug 08, 2009 6:12 am
Forum: AM Radio
Topic: Synchronous Amplifiers
Replies: 27
Views: 4572

Synchronous Amplifiers

WBZT(1230), West Palm Beach, Florida, has one in Pompano Beach, Florida, which covers more people than the station's main transmitter. WBT(1110), Charlotte, NC, used to have one in their night time null. Why is WBZT allowed to operate one? Why did WBT's go away? Why do so few, if any, others still e...
by ai4i
Tue Jul 28, 2009 3:47 pm
Forum: AM Radio
Topic: Special issue with stations on 910KHz
Replies: 2
Views: 788

Re: Special issue with stations on 910KHz

Oh yes, 450KHz seems to have become the defacto world digital standard, divisable by both 9KHz and 10KHz.
Good point, I would h8 to have been stuck with a hypothetical graveyard station on 1400KHz during depression era Cincinatti.
by ai4i
Tue Jul 28, 2009 9:03 am
Forum: AM Radio
Topic: Special issue with stations on 910KHz
Replies: 2
Views: 788

Special issue with stations on 910KHz

When we drive up to a station near 910 KHz, we hear them on their normal frequency and also on 910 (455x2). This is understandable, but what if we were within the one volt contours of two local stations 450/460 KHz apart and wanted to hear another, more distant station on 910? Is there or should the...
by ai4i
Tue Apr 07, 2009 3:52 pm
Forum: AM Radio
Topic: 2.5 MEGAWATTS of AM power........
Replies: 12
Views: 2816

Re: 2.5 MEGAWATTS of AM power........

The skywave a few hundred kilometers away would sound like a local fifty kilowatter!
by ai4i
Sun Mar 08, 2009 9:20 am
Forum: Ham Radio
Topic: Time Station CHU is moving
Replies: 2
Views: 792

Re: Time Station CHU is moving

Looks like their second harmonic station at 14,670 KHz has not moved to 15,700 KHz.
by ai4i
Sun Mar 08, 2009 6:14 am
Forum: FM Radio
Topic: With channel sixes going dark...
Replies: 6
Views: 1035

Re: With channel sixes going dark...

BroadcastDoc wrote:And many LPTV's will file for 6 as well...:)
I think full power stations always have priority over low power stations.
by ai4i
Sat Mar 07, 2009 3:23 pm
Forum: FM Radio
Topic: With channel sixes going dark...
Replies: 6
Views: 1035

With channel sixes going dark...

Many non-com FM's will be given opportunities to increase their facilities.
Comments?
by ai4i
Sun Jan 11, 2009 2:19 pm
Forum: SW Radio
Topic: Pics of VOA Greenville
Replies: 9
Views: 5776

Re:

K9EZ wrote: I understand the ERP out of Greenville is on the order of 30 MEGAwatts.
But they still fade! :lol: I'd rather have a 3Kw station in orbit.
by ai4i
Thu Jan 01, 2009 7:49 pm
Forum: FM Radio
Topic: Third adjacent protection to be removed?
Replies: 31
Views: 4636

Re: Third adjacent protection to be removed?

AM spacing is about occupied bandwidth, and that is about the transmitted sidebands. Modulation depth doesn't play into it directly. A carrier modulated with a 10 KHz tone at 50% occupies the same bandwidth as a 10 KHz tone at 100%. The difference in occupied bandwidth over 100% is caused by the ha...
by ai4i
Thu Jan 01, 2009 7:51 am
Forum: FM Radio
Topic: Third adjacent protection to be removed?
Replies: 31
Views: 4636

Re: Third adjacent protection to be removed?

With all due respect, being next to the transmitter is not a good test. What is the power level of the second-adjacent 10-15 miles away? Today's radios will produce pristine hiss two channels from a strong local signal where no station is present, Can someone honestly tell me there is a difference ...
by ai4i
Tue Dec 09, 2008 7:33 pm
Forum: FM Radio
Topic: 10.7 IF Spacing
Replies: 6
Views: 1679

Re: 10.7 IF Spacing

There was a stink at the time the station on 99.1 moved to the point where the local channel six (unhappy with the 88.5's existance) became involved. The IF separation requirement is probably as necessary as third and forth adjacency protection is in today's world. We used to hear cars driving by li...