Search found 772 matches

by Dale H. Cook
Thu Jan 11, 2018 9:12 am
Forum: FM Radio
Topic: Harris FM K5 Freq Change
Replies: 18
Views: 550

Re: Harris FM K5 Freq Change

The PA tuning is fairly straightforward but the usual problem are is getting the driver matched to the grid on the PA. On the 10 and 20 there is some "bend tuning" involved. I was involved in the field retuning of a 20H3, which, IIRC, used the same cavity as the 20K. We had a Harris field tech come...
by Dale H. Cook
Wed Jan 10, 2018 2:56 pm
Forum: AM Radio
Topic: What is this? A 5 kw Dummy Load or what?
Replies: 22
Views: 2142

Re: What is this? A 5 kw Dummy Load or what?

ncradioeng wrote:
Wed Jan 10, 2018 1:43 pm
I was told the the 51.5 ohm value came from early RCA rigid coax line that was made from standard copper water pipe sizes.
That is correct, and all of my oldest broadcast catalogs show 51.5 Ohms as the standard antenna, line and termination value.
by Dale H. Cook
Tue Jan 09, 2018 9:15 am
Forum: AM Radio
Topic: What is this? A 5 kw Dummy Load or what?
Replies: 22
Views: 2142

Re: What is this? A 5 kw Dummy Load or what?

COMMENG wrote:
Mon Jan 08, 2018 10:51 am
The "resistive" strip appears to have come from an older Gates BC-1T or similar vintage vacuum tube transmitter.
I agree - I have a BC-1T load here and it appears identical. Bear in mind that a BC-1T load is not a 50 ohm load - it is a 51.5 ohm load.
by Dale H. Cook
Sun Dec 31, 2017 9:25 am
Forum: Internet Streaming
Topic: Getting Through Windows Firewall
Replies: 4
Views: 125

Getting Through Windows Firewall

I have a customer with a secondary transmitter site out of listening range, and I want to set up a private WME stream so staff can dial in and hear how the off-air audio sounds. My problem is configuring Windows Firewall (under Win7) to allow inbound access to the pull the stream. I've never worked ...
by Dale H. Cook
Sun Dec 31, 2017 9:17 am
Forum: FM Radio
Topic: Wanted reliable monitor amp
Replies: 11
Views: 384

Re: Wanted reliable monitor amp

kcbooboo wrote:
Sun Dec 31, 2017 7:26 am
The Crown D-75 or D-75A amps can be found cheap. Once you replace ...
I concur with Bob. At the moment I have one third in line in the shop queue for a customer.
by Dale H. Cook
Sun Dec 24, 2017 7:13 pm
Forum: AM Radio
Topic: Collins 310W-1 Exciter
Replies: 3
Views: 232

Re: Collins 310W-1 Exciter

REW wrote:
Sun Dec 24, 2017 12:53 pm
I found a spare crystal for 1440khz so I think it is in the upper end of the band.
Only the divider and crystal freq change - the rest of the exciter is broadband 540 kHz to 6+ MHz.
by Dale H. Cook
Sun Dec 24, 2017 6:28 am
Forum: Radio Studio Engineering
Topic: Broadcast Electronics Console Model 5S150 Issues
Replies: 21
Views: 664

Re: Broadcast Electronics Console Model 5S150 Issues

Shane wrote:
Sun Dec 24, 2017 1:00 am
That’s it except this one had a 60V supply. Still enough to give one a good zap if not careful.
I don't recall which supply was in the McMartin console (I think a B-803) that I last worked on in 1987. I do remember it could give you a poke. I was never too thrilled with that console.
by Dale H. Cook
Sat Dec 23, 2017 11:25 pm
Forum: Radio Studio Engineering
Topic: Broadcast Electronics Console Model 5S150 Issues
Replies: 21
Views: 664

Re: Broadcast Electronics Console Model 5S150 Issues

re: that BE console, the 150 series IIRC didn't have the program/audition selector for the VU meters but the 250 did. The 250 also had step attenuators. Both used the same plug in cards of which there were at least two versions. Still quite a few of those in service. I haven't worked on a 150 serie...
by Dale H. Cook
Sat Dec 23, 2017 7:04 am
Forum: Everything else
Topic: Merry Christmas
Replies: 7
Views: 303

Re: Merry Christmas

A merry Christmas to all from southwestern VA. A couple of weeks ago we got some snow and I photographed the house for this year's Christmas card. It wasn't enough to count as snow for my cousin, who lives in Juneau, but I figured it was the closest to a white Christmas that I would get this year. h...
by Dale H. Cook
Fri Dec 22, 2017 10:02 am
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 25
Views: 906

Re: RF Spectrum Analyzer

I am on wife 0.0. At 66 I still haven't found a woman who would put up with the sometimes highly irregular hours and days that I work.
by Dale H. Cook
Fri Dec 22, 2017 10:00 am
Forum: AM Radio
Topic: Collins 310W-1 Exciter
Replies: 3
Views: 232

Re: Collins 310W-1 Exciter

Anybody got a schematic for a 310W-1 AM exciter? There are three principal versions of the 310W-1 for different frequency ranges. The broadcast band version (which I believe was designated 310W-1/MF) comes in two flavors. The oscillator frequency is four times the carrier frequency for frequencies ...
by Dale H. Cook
Thu Dec 21, 2017 5:23 am
Forum: Radio Studio Engineering
Topic: Broadcast Electronics Console Model 5S150 Issues
Replies: 21
Views: 664

Re: back in the '80s had a 5S150

RGORJANCE wrote:
Wed Dec 20, 2017 5:37 pm
You ain't old.
Older than I am, but I'm getting there. The first console I ran was a mid-'50s classic - a Collins 212E-1, a veritable tank. For remotes we used its baby brother, the 212Z-1 (I own one of those).
by Dale H. Cook
Sat Dec 02, 2017 7:25 am
Forum: AM Radio
Topic: Low Power AM ATU question....
Replies: 6
Views: 735

Re: Low Power AM ATU question....

If he's running a 7m antenna it is not a Part 15 antenna, as that is limited to 3m with ground lead. He is in the UK, anyway, so not bound by Part 15. I will second the suggestion of Bill DeFelice to use something like an LPB ATU-30, which is designed to handle a 30 Watt transmitter and can provide ...
by Dale H. Cook
Wed Nov 29, 2017 9:09 am
Forum: Radio Studio Engineering
Topic: adjustable Studio desk
Replies: 8
Views: 486

Re: adjustable Studio desk

But in today's AOIP/IP world, a couple of Cat5 cables properly routed (physically) would probably survive very well... Multiple runs of Gepco 16pair maybe not so much. Keep in mind that I work outside the top 100 markets. In my market a couple of clusters have digital consoles, but most of the mark...
by Dale H. Cook
Tue Nov 28, 2017 7:36 am
Forum: Radio Studio Engineering
Topic: adjustable Studio desk
Replies: 8
Views: 486

Re: adjustable Studio desk

In nearly 50 years in this business I have never seen an adjustable height desk in a studio. Consoles (and sometimes other equipment) are often cabled to punch blocks, and the mult cable used is designed for fixed installation, not for repeated flexing.