Search found 72 matches

by Joe Friday
Sun Feb 18, 2018 7:29 pm
Forum: FM Radio
Topic: Harris FM-25K issue
Replies: 16
Views: 1048

Re: Harris FM-25K issue

I wanted to post a follow up to this thread. At this point I am "knocking on wood", but it looks like I might finally have this problem resolved. The problem appears to have been an intermittent screen supply breaker in the HV cabinet. I enlisted the help of another engineer, and we tore down the gr...
by Joe Friday
Sun Jan 14, 2018 2:47 pm
Forum: FM Radio
Topic: EO IPA question
Replies: 1
Views: 198

EO IPA question

A quick question...does anyone know what kind of rigid coax the output transformer is made from on an EO 300W IPA? The circuit designation is T2 I believe. The one I have uses the MFR151G FET. The center conductor appears to be intermittently open in the one I have on the bench currently. The IPA is...
by Joe Friday
Sun Dec 03, 2017 7:32 pm
Forum: FM Radio
Topic: Harris FM-25K issue
Replies: 16
Views: 1048

Re: Harris FM-25K issue

The coax on my unit is the upgraded RG400, and is in good condition, but it is one thing in the circuit that has not been changed. Still having issues. Most recently, the transmitter was brought up having been off air for four days, and ran perfectly without any re tuning necessary for about 18 hour...
by Joe Friday
Mon Nov 13, 2017 6:01 pm
Forum: Radio Automation Systems
Topic: STORQ Users--Downgrade coming
Replies: 12
Views: 593

Re: STORQ Users--Downgrade coming

Very interesting...one of my client stations just commissioned a new WIN7 based Storq system last month...Not my favorite program delivery system, but they work. I was a little confused that they sent one, as another station in the group running the same format had moved off the Storq onto the iPump...
by Joe Friday
Mon Nov 13, 2017 5:51 pm
Forum: Radio Studio Engineering
Topic: GR EAS-1/CAP-DEC-1 issues
Replies: 9
Views: 464

GR EAS-1/CAP-DEC-1 issues

I take care of two groups that utilize Gorman/Redlich EAS equipment. I was just filing Form Three for the recent NPT, and while reviewing the logs, noticed that these boxes did not process any alerts from the internet via IPAWS. I have not checked the CAP-DEC-1 unit logs, but the test was not proces...
by Joe Friday
Tue Nov 07, 2017 6:59 am
Forum: FM Radio
Topic: Harris FM-25K issue
Replies: 16
Views: 1048

Re: Harris FM-25K issue

Thank you to all who replied. To answer some of the questions posed in the responses: I don't know what the BW transmitter is seeing when the IPA overload condition happens...It is about four racks away connected by a RG-8U jumper. When the 25K senses an overload, it interrupts power to the BW unit ...
by Joe Friday
Mon Nov 06, 2017 6:24 am
Forum: FM Radio
Topic: Harris FM-25K issue
Replies: 16
Views: 1048

Harris FM-25K issue

I take care of a FM-25K that I am pulling my hair out over. It is about 100 miles away and has a very intermittent condition I have had no luck in addressing. The transmitter is configured to use an external BW Broadcast 600W box as the driver. It is properly interlocked and controlled by the 25K, j...
by Joe Friday
Tue Apr 18, 2017 7:40 pm
Forum: AM Radio
Topic: EO Pulsar 1KW problem
Replies: 9
Views: 1447

Re: EO Pulsar 1KW problem

Thanks for the responses. The failed fuses are always a non-catastrophic failure, just barley melted. I don't believe normal current draw is a problem, as I briefly replaced the 3A fuse with a 1A fuse, and the transmitter ran for about 5 minutes before I swapped it out for the proper size. At this p...
by Joe Friday
Wed Apr 12, 2017 8:38 pm
Forum: AM Radio
Topic: Collins 310W-1 Exciter Divider
Replies: 20
Views: 2290

Re: Collins 310W-1 Exciter Divider

I take care of one of these transmitters, but don't know if the exciter manual is still on site or not. I may have the chance to drop by tomorrow, and will get back to you if I turn something up.

Kevin
by Joe Friday
Wed Apr 12, 2017 8:33 pm
Forum: AM Radio
Topic: EO Pulsar 1KW problem
Replies: 9
Views: 1447

EO Pulsar 1KW problem

I look after a 1KW EO Pulsar that has a strange problem. In the exciter chassis, it will occasionally blow the 3A +15V fuse. It is a non-catastrophic failure, and the transmitter immediately returns to air following replacement of the blown fuse. Generally, it will run between 4-6 months between blo...
by Joe Friday
Tue Apr 04, 2017 5:26 am
Forum: FM Radio
Topic: Sine Systems RAK-2
Replies: 3
Views: 570

Sine Systems RAK-2

I have used the Sine RFC-1/B for many years, and generally like them. I came across info on the RAK-2 and it looks interesting, as it gives the RFC-1/B a web interface and the ability to e-mail or text alarm conditions. Anyone have any experience with one of these?

Thanks!

Kevin
by Joe Friday
Fri Feb 17, 2017 6:17 pm
Forum: FM Radio
Topic: Reviving a dormant antenna system
Replies: 11
Views: 1240

Re: Reviving a dormant antenna system

FYI...this is a non-comm religious station, and every dime that we have spent has been given as a donation to the project. What I have done so far: I have swept the antenna system with my TG/RLB, and get a return loss of 26 DB at the carrier frequency. Next I fired 200W into the system, and calculat...
by Joe Friday
Sat Feb 11, 2017 3:18 am
Forum: FM Radio
Topic: Reviving a dormant antenna system
Replies: 11
Views: 1240

Reviving a dormant antenna system

I am in the process of working on a CP for a facility that has been off the air since 2001. The CP is at the same location, class, and ERP as the original, and they would like to make use of the the old antenna and feedline. The system comprises a 4 bay ERI HP rototiller, end fed, and approximately ...
by Joe Friday
Wed Jan 18, 2017 6:25 am
Forum: FM Radio
Topic: How Old is Old?
Replies: 16
Views: 2127

Re: How Old is Old?

I take care of a class B that had a burn out of their HJ8 line about six years ago, before I started taking care of it. They considered a new antenna at the time, but the lead time was an issue. The antenna in an early six bay ERI rototiller, was installed in the early 70's. ERI was able to supply a...
by Joe Friday
Wed Jan 11, 2017 6:27 am
Forum: FM Radio
Topic: ECO-4 question
Replies: 8
Views: 1073

Re: ECO-4 question

Well...that was the part I was missing. Thanks for helping with the connection info to TB10-3 on the PC85 board. It appears that it must still be in the circuit somehow. I'll head back out to the site and look things over and see if I can figure out what error I made. Thanks for looking at the diagr...