Search found 837 matches

by Dale H. Cook
Thu Nov 29, 2018 5:00 am
Forum: AM Radio
Topic: AM Radio Wall
Replies: 13
Views: 500

Re: AM Radio Wall

I think I've told this one before, but right after we put a 10 kW daytimer on the air the a man in a house across the street from the transmitter site (and in the middle of the main lobe) complained of music in his basement. The water meter was at one end of the basement and the water heater and wat...
by Dale H. Cook
Thu Nov 15, 2018 12:02 pm
Forum: On-Air Studios
Topic: Dayton Receiver Manuals
Replies: 1
Views: 257

Re: Dayton Receiver Manuals

I have posted my collection of Dayton manuals at:

https://plymouthcolony.net/starcityeng/ ... tml#dayton

I would appreciate any contributions, especially raw image scans, to expand that collection.
by Dale H. Cook
Fri Nov 09, 2018 6:43 am
Forum: AM Radio
Topic: ATU rebuild
Replies: 21
Views: 739

Re: ATU rebuild

Deep Thought wrote:
Thu Nov 08, 2018 8:24 pm
... I can model it and get pretty close to the right phase shift for optimum bandwidth without having to do a full sweep.
Deep has significantly better software tools than the rest of us. I can only do that the old fashioned way, with a bridge and a Smith chart. :wink:
by Dale H. Cook
Wed Nov 07, 2018 2:58 pm
Forum: AM Radio
Topic: ATU rebuild
Replies: 21
Views: 739

Re: ATU rebuild

An OIB-1 is not going to give you an accurate tower self resistance for a tower with that high an R and X. Design to the last measured tower impedance unless you have a reason to think it has changed. If you have the last measured impedance I hope it was a full sweep, which will let you optimize th...
by Dale H. Cook
Tue Nov 06, 2018 12:16 pm
Forum: AM Radio
Topic: ATU rebuild
Replies: 21
Views: 739

Re: ATU rebuild

To do a Smith Chart you need to use a signal generator and detector with the OIB to measure the base impedance at, say, 1kHz increments out to +/- 10 kHz of the carrier frequency in order to look at the cusps.
by Dale H. Cook
Tue Nov 06, 2018 4:42 am
Forum: AM Radio
Topic: ATU rebuild
Replies: 21
Views: 739

Re: ATU rebuild

Have you done a Smith chart of the proposed design to see what the cusps look like, and to see if they need rotation?
by Dale H. Cook
Sun Sep 30, 2018 11:07 am
Forum: Radio Studio Engineering
Topic: Inovonics 719 David IV
Replies: 2
Views: 156

Re: Inovonics 719 David IV

kkiddkkidd wrote:
Sat Sep 29, 2018 8:26 am
I only have 1 David processor at a station and find myself fairly underwhelmed by it.
I have worked with a couple of them and am in the same position. If you buy budget processing you get budget processing, and should not expect something that can compete with an Orban or an Omnia.
by Dale H. Cook
Sun Sep 30, 2018 11:03 am
Forum: On-Air Studios
Topic: Phone Patch
Replies: 14
Views: 533

Re: Phone Patch

Although the phone line is being hauled by a cable company, it seems to me to be of pretty good quality... I don't hear all the digital artifacts I hear on my cell phone... sounds about the same as copper to me. It may sound the same as copper to your ears but it is not. It is bit reduced, just not...
by Dale H. Cook
Fri Sep 28, 2018 5:32 am
Forum: On-Air Studios
Topic: Phone Patch
Replies: 14
Views: 533

Re: Phone Patch

... a good old fashioned phone line... even though, in this case, the phone is hauled by Spectrum Cable. Then it is not POTS. When we speak of POTS ("Plain Old Telephone Service"] we mean a copper pair, which in many areas nowadays is actually fiber for most of the run. It is not the same as a bit-...
by Dale H. Cook
Thu Sep 27, 2018 3:29 pm
Forum: On-Air Studios
Topic: Phone Patch
Replies: 14
Views: 533

Re: Phone Patch

A couple of years ago my last client still using a Gentner digital had their go Tango Uniform so I have none left in the field. I have two of their older analog hybrids still chugging along at client studios. In recent years I have installed some JK Innkeeper digital hybrids and they seem to be pret...
by Dale H. Cook
Thu Sep 27, 2018 10:42 am
Forum: On-Air Studios
Topic: Phone Patch
Replies: 14
Views: 533

Re: Phone Patch

Usually we buy one. One major reason for that is that for many years the best hybrids have used digital signal processing on the caller audio, and that is something that you are not likely to be able to homebrew. One caveat about the Gentner hybrids - the digital ones use proprietary ICs. All of th...
by Dale H. Cook
Wed Sep 26, 2018 6:55 pm
Forum: General Computers
Topic: Designing website with Muse,Wix,Weebly vs. straight HTML
Replies: 10
Views: 1988

Re: Designing website with Muse,Wix,Weebly vs. straight HTML

My sites are not mobile-friendly, but I plan to work on that this winter because that is the season when my workload is at a minimum. Thanks for the heads-up on online testing sites.
by Dale H. Cook
Tue Sep 25, 2018 10:45 am
Forum: General Computers
Topic: Designing website with Muse,Wix,Weebly vs. straight HTML
Replies: 10
Views: 1988

Re: Designing website with Muse,Wix,Weebly vs. straight HTML

One possible problem that needs to be tested for is that some software tools create pages that may not display as intended in all browsers or on all platforms. The classic example is Microsoft FrontPage (now discontinued) which used specialized coding that would only display as intended when the pag...
by Dale H. Cook
Sun Sep 02, 2018 4:51 am
Forum: Radio Studio Engineering
Topic: Weird satellite problem
Replies: 9
Views: 385

Re: Weird satellite problem

Have you looked at the satellite downlink on a Spectrum analyzer to see what it looks like? +1 A spectrum analyzer is a must for setting up a dish for a digital C band receiver in the era of 2 degree spacing. It is the only way to properly minimize interference from cross polarization. Going just b...
by Dale H. Cook
Sat Sep 01, 2018 1:00 pm
Forum: Ask the Engineers
Topic: Cablewave Part No. - N Female for FLC78-50
Replies: 9
Views: 232

Re: Cablewave Part No. - N Female for FLC78-50

Maybe this will help. Thanks, but it doesn't - that is for RFS FLC78-50J, which is a different cable than the original Cablewave FLC78-50. What we are getting from RFParts are a pair of 7/16 DIN female connectors, and we also are getting a pair of 7/16 DIN male to N female adapters. Finding connect...