Search found 43 matches

by rfn
Fri Sep 18, 2020 10:52 am
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 524

Re: Quality translator

Jeff put me onto ferrite toroids some 26 years ago when installing an ND25. During a rare lightning season several years later there were multiple hits - we had zero damage. Station literally across the street had serious damage. It happened again (this time we have an NX25) about a month ago. Same ...
by rfn
Sat Apr 18, 2020 11:50 am
Forum: AM Radio
Topic: WCBS/880 no longer HD-AM
Replies: 11
Views: 810

Re: WCBS/880 no longer HD-AM

The MDCL modifications were done by a "consultant" who it was alleged had done a large number of them. I was grudgingly allowed to be on site and didn't like what I saw happening. When it was done one of the two exciters, both of which had no history of trouble, no longer worked. I took some notes a...
by rfn
Fri Apr 17, 2020 1:14 pm
Forum: AM Radio
Topic: WCBS/880 no longer HD-AM
Replies: 11
Views: 810

Re: WCBS/880 no longer HD-AM

Not specific to WCBS.... Just over a year ago I replaced a Nautel ND25 with a new NX25. The ND had been modified for MDCL and it did save quite a bit on power costs but had a terrible impact on coverage. The station is in Alaska - primarily serving extremely remote villages. In fact, the power cost ...
by rfn
Fri Mar 06, 2020 3:39 pm
Forum: Ask the Engineers
Topic: Is my Rate too high or is the owner high?
Replies: 13
Views: 671

Re: Is my Rate too high or is the owner high?

Thanks to all for the info on the automation system for OSX....no, I hadn't heard about it! I'll check it out but the Linux concept seems a bit much for my advanced age and disposition. The one station for which I do pro bono is a non-profit AM/FM deep in the throes of Zetta (until recently I though...
by rfn
Thu Mar 05, 2020 9:42 pm
Forum: Ask the Engineers
Topic: Is my Rate too high or is the owner high?
Replies: 13
Views: 671

Re: Is my Rate too high or is the owner high?

Fascinating! At age 78 I still do pro-bono for one station I've worked with since 1972. Even for them I don't mess with automation systems. Just tell 'em that even for my wife I DON'T DO WINDOWS! So far nobody's come up an OSX automation or control system so I'm safe. It's just a matter of time........
by rfn
Wed Feb 19, 2020 12:47 pm
Forum: From the Trenches
Topic: Oh those viewer calls...
Replies: 14
Views: 4139

Re: Oh those viewer calls...

Sounds like we may have worked at the same station at different times. Another one: Caller from a newly-built high-rise senior building called to complain that Channel 6 was making her apartment cold. She'd start her viewing day with the news - she loved the sports guy. But within an hour her apartm...
by rfn
Tue Feb 18, 2020 1:03 pm
Forum: From the Trenches
Topic: Oh those viewer calls...
Replies: 14
Views: 4139

Re: Oh those viewer calls...

Woman called saying she couldn't see Channel 6 between 4-5 pm. Only those hours. She was the first. Over several days there were more calls with the same complaint. Plotted them on a map. Tight cigar-shaped pattern. Ummmmm.. Visited two of the homes. Yup. 4-pm sharp strong interference that continue...
by rfn
Fri Feb 14, 2020 10:08 am
Forum: AM Radio
Topic: ND-25 Problem
Replies: 5
Views: 361

Re: ND-25 Problem

Sounds all too familiar. Had to deal with an ND25 with similar symptoms a couple of years ago. It traced to a power bus having burned up in the rack with the major power transformer. It's in a difficult to reach location which allows it to escape notice when doing the annual tightening down of all c...
by rfn
Mon Nov 11, 2019 10:00 am
Forum: AM Radio
Topic: Asymmetrical modulation
Replies: 76
Views: 20032

Re: Asymmetrical modulation

And there is why I carry a phase-shifting XLR/XLR when doing work for stations using asymmetric modulation.
by rfn
Thu Oct 10, 2019 9:08 am
Forum: AM Radio
Topic: Tower Lighting
Replies: 10
Views: 1194

Re: Tower Lighting

Possible source: Perhaps a long shot but certainly worth a try. In my younger days I voluntarily maintained a rotating airways beacon. It used the same Duro lamps we've been talking about here. Almost all such beacons have long-since been converted to LED. There is a good chance that there are prett...
by rfn
Sun Oct 06, 2019 11:54 am
Forum: AM Radio
Topic: Tower Lighting
Replies: 10
Views: 1194

Re: Tower Lighting

It's pushing 15 years since I converted the 230 foot tower from incandescent to LED. I still have 3-4 of the beacon lamps hanging around and feel pretty sure management would part with them for a nominal price but wonder about the cost of shipping and possible damage. They're in Nome, Alaska. PM me ...
by rfn
Sat Sep 07, 2019 12:32 pm
Forum: FM Radio
Topic: Quick STL Question
Replies: 6
Views: 931

Re: Quick STL Question

Thanks for the reminder....it was Mike Patton who overhauled the STL transmitter for KNOM. Quick turnaround and beautiful workmanship. The 10+ (perhaps 20?) old transmitter humming along better than new.
by rfn
Fri Sep 06, 2019 9:18 am
Forum: FM Radio
Topic: Quick STL Question
Replies: 6
Views: 931

Re: Quick STL Question

Funny the call-letter similarity..... I recently have had several Marti units reworked for KNOM. Some using Broadcast Electronics. I had been cautioned that they were expensive and took a long time but was very pleasantly surprised at how quick and how moderate in cost. Recently I had an STL unit re...
by rfn
Wed Aug 28, 2019 6:40 pm
Forum: Ask the Engineers
Topic: Marti Crystals
Replies: 6
Views: 642

Re: Marti Crystals

I just had two RPT-2s overhauled by BE (successor toi Marti). Had been told to expect a long turnaround but they were back amazingly quickly. I had suspected crystals but the problem turned out to be the crystal ovens, Right now I'm looking at two RPT-15s which seem OK on frequency - they were seldo...
by rfn
Wed Aug 21, 2019 8:38 pm
Forum: AM Radio
Topic: UNI
Replies: 14
Views: 1001

Re: UNI

Thanks for the .pdf of Mullaney's article! I had a copy years ago and lost it. John (the elder) designed the folded unipole antenna for KNOM (780) in Nome, AK. Originally it was a 3-fold skirt and a bear to keep going. Bandwidth was always problematic. After many years it was reworked to 6--fold in ...