Search found 552 matches

by kcbooboo
Mon Jul 15, 2019 4:04 am
Forum: FM Radio
Topic: Harris Z FM FET replacement
Replies: 7
Views: 320

Re: Harris Z FM FET replacement

"Nautel advises 6 INCH pounds of torque on their pallets. Yes---INCH/Pounds. There are 16 inch pounds to a foot pound."

There are 16 ounces per pound but only 12 inches per foot.

Perhaps you mean there are 12 (twelve) inch pounds to a foot pound, since there are 12 inches in a foot.

Bob M.
by kcbooboo
Wed Jul 10, 2019 4:36 pm
Forum: FM Radio
Topic: Replacement dehydrator pressure switch
Replies: 2
Views: 137

Re: Replacement dehydrator pressure switch

I googled: adjustable pressure switch and got several decent suppliers with units in the 3-6psi range for between $50 and $150. I also googled: Johnson Controls P61AA-35C and found one supplier that claims to have one unit in stock for around $35. You might try MSC instead of Grainger. Bob M.
by kcbooboo
Wed Jul 10, 2019 5:50 am
Forum: AM Radio
Topic: BE AM-6A RF Out Problem
Replies: 18
Views: 448

Re: BE AM-6A RF Out Problem

As I recall, the ATU isn't the easiest unit to get into for "routine" maintenance. However if you DO get inside it, make sure the roller inductor rotating shafts are clean and lubricated with an appropriate grease so they don't jam up. Had that happen one night. Couldn't get the roller shaft out wit...
by kcbooboo
Wed Jul 03, 2019 1:33 pm
Forum: Everything else
Topic: What's with all the spam lately?
Replies: 6
Views: 106

Re: What's with all the spam lately?

Holding first-time posts for moderator approval is certainly one easy way to handle things, however if the admins don't want to take on new moderators who are willing to do that, there's not much anyone else can do except go elsewhere, which may be their intent. I'm up early too and have reported my...
by kcbooboo
Thu Jun 27, 2019 6:53 am
Forum: FM Radio
Topic: 75 uSec Pre-Emphasis Graph
Replies: 10
Views: 336

Re: 75 uSec Pre-Emphasis Graph

Lots of those old FM TX manuals had that graph. I presume even the FCC's regulations had it at one point. It might even be in some older CBS FM Volumax manuals.

Bob M.
by kcbooboo
Thu Jun 27, 2019 5:50 am
Forum: FM Radio
Topic: 75 uSec Pre-Emphasis Graph
Replies: 10
Views: 336

Re: 75 uSec Pre-Emphasis Graph

It's not the best, but there is one on this web page, plus there's a link to a PDF version of the article: https://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01237.html The standard 75 uSec pre-emphasis provides a 6dB increase per octave above approximately 400 Hz. It could be as simple as a 1uF cap in...
by kcbooboo
Sat Jun 08, 2019 5:07 am
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

Re: AM station to shut down at end of May 2019

As far as I know, the site is unchanged except for a very expensive Kintronic notch filter to get rid of an intermod product detected a few years ago. They were also running the stock C-QUAM stereo built into the BE transmitter. Ryan inherited WADS from Clif. I don't know if he inherited any others....
by kcbooboo
Fri Jun 07, 2019 1:34 pm
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

Re: AM station to shut down at end of May 2019

Clif and Ryan took care of WQUN-AM. Tom and I did WQAQ-FM. Totally independent operations. I don't know who it taking care of the FM these days. The FM was/is student run. The AM was/is a paid commercial business operation.

Bob M.
by kcbooboo
Fri Jun 07, 2019 5:47 am
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

Re: AM station to shut down at end of May 2019

"Quinipiac University also has a student run class D FM on 98.1, WQAQ. So the college still *has* a radio station, just not the AM." True, but the AM was a commercial station that ran some network shows and quite a lot of local live shows with real announcers etc, so it could make money legitimately...
by kcbooboo
Thu Jun 06, 2019 5:14 am
Forum: FM Radio
Topic: Changing Frequency Of Belar RFA-1 FM RF Amplifier
Replies: 6
Views: 313

Re: Changing Frequency Of Belar RFA-1 FM RF Amplifier

A quick look at the manual didn't show any frequency-dependent components other than the crystal.

Bob M.
by kcbooboo
Sun Jun 02, 2019 4:50 am
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

Re: AM station to shut down at end of May 2019

Saturday morning, June 1 2019, the AM band got a bit cleaner as WQUN / 1220 in Hamden CT was not on the air. That frequency has been active since the 1960s and has probably had close to a dozen callsigns through the years. Now I have one less station that needs annual EPMs.

Bob M.
by kcbooboo
Sat Jun 01, 2019 4:28 am
Forum: Ask the Engineers
Topic: Audio dropouts on Yankees game broadcasts
Replies: 34
Views: 1287

Re: Audio dropouts on Yankees game broadcasts

Funny you should mention that. I was listening to Friday night's game (last night) and thought "Gee, I haven't heard any dropouts..." then of course one happened a couple of minutes after 9pm. A couple of days ago there were lots of very long dropouts, some that were at least one full second, maybe ...
by kcbooboo
Fri May 24, 2019 4:45 am
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

Re: AM station to shut down at end of May 2019

Yup. The cat's out of the bag. The station currently runs 1kw day, ~300w night, directional, same pattern. They have an AM-1A running the built-in stereo (that's rare these days) with an older RCA BTA-1x as backup. At one time the studios and offices shared the same ranch-style house but when the co...
by kcbooboo
Thu May 23, 2019 12:10 pm
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 828

AM station to shut down at end of May 2019

An AM station that's been around for probably 60+ years under at least half a dozen callsigns is shutting down at the end of the month. It's owned by a local college. If they actually do pull the plug and don't get an immediate buyer, what happens to the frequency allocation? They're directional and...
by kcbooboo
Thu May 09, 2019 1:33 pm
Forum: Ask the Engineers
Topic: Audio dropouts on Yankees game broadcasts
Replies: 34
Views: 1287

Re: Audio dropouts on Yankees game broadcasts

Apparently the LNB was having some issues a few days ago and the CE replaced it. The error log showed low signal levels until the sun heated it up. I'll have to listen to the Yankees game tonight and see if there are still dropouts. Stay tuned to this station for further news and information. This c...