Search found 599 matches

by RFWarrior
Tue May 19, 2020 6:02 am
Forum: FM Radio
Topic: Nautel NV10 FM transmitter
Replies: 1
Views: 349

Re: Nautel NV10 FM transmitter

Sorry for the delayed response - when I'm busy (seems to be more often than not, which I guess is good, considering), listservers get looked at last. :( It's fairly intuitive if you've got access to the transmitter AUI (as well as the operations manual). There are a few things to be aware of... your...
by RFWarrior
Wed Mar 04, 2020 8:18 pm
Forum: AM Radio
Topic: Nautel Xmtrs -- For Sale
Replies: 4
Views: 558

Re: Nautel Xmtrs -- For Sale

The ND-1 is about to go out of "economical service" life due to some NLA components, but it is still a good transmitter and easily retuned to a different frequency despite what Nautel will tell you. On that, I'm pretty sure I've got access to the filter tuning procedure - and Mark's right, it's pre...
by RFWarrior
Wed Jul 10, 2019 8:11 am
Forum: AM Radio
Topic: Nautel XR3 RS-232?
Replies: 2
Views: 465

Re: Nautel XR3 RS-232?

The XR3/6 is still in production but I don't know about the NxLink. Yup, we can still provide NX-Link and it can be done as a field retrofit. It's a basic text only display, but gives you on/off, exciter change, power raise lower and the ability to select presets. You can monitor any parameter that...
by RFWarrior
Wed Mar 13, 2019 12:43 pm
Forum: AM Radio
Topic: Retune Harris DX10
Replies: 11
Views: 1387

Re: Retune Harris DX10

I'm curious if anyone has replaced something like a DX10 or SX-? with a new Nautel or other transmitter and observed a significant increase in efficiency? I actually would have though that the efficiency would be reasonably close (not withstanding MDCL) but have never had occasion to replace a SS T...
by RFWarrior
Wed Jan 23, 2019 5:34 am
Forum: Everything else
Replies: 3
Views: 528


Further to this, there will be a memorial for Jeff in Racine on Feb. 1... from Chuck Kelly: "Jeff’s funeral is Friday February 1st, First Evangelical Lutheran Church, 728 Villa St, Racine at 11 AM with Visitation 10AM. Luncheon follows at Infusino's Restaurant, 3201 Rapids Drive, Racine." I got to k...
by RFWarrior
Mon Sep 17, 2018 8:44 pm
Forum: FM Radio
Topic: TX + Bad Memory = Off Air
Replies: 10
Views: 1394

Re: TX + Bad Memory = Off Air

I think the transmitter is a BE. Naw, I have to confess it's one of ours - an original NV series - and the article is fairly accurate. The older NV transmitters did a lot more R/W cycles to the flash card than the newer GV series do - and that does kill CF cards a tad more quickly (marketing unders...
by RFWarrior
Mon Sep 17, 2018 8:21 pm
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 1748

Re: Crystal alternative

... unless the Nautel would allow the "divide-by-four", which they use at lower frequencies, to work. Maybe?... The only challenge might be the way the ND1 derives the 2Fc/N signal that it uses for the PDM reference... I can't remember if that's taken from the input of the second /2 circuit or else...
by RFWarrior
Mon Sep 17, 2018 8:13 pm
Forum: Administrator Announcements
Topic: A note about identifying users
Replies: 1
Views: 1212

Re: A note about identifying users

What, my logo and sig file didn't give it away? :D
by RFWarrior
Mon Jul 23, 2018 8:49 am
Forum: AM Radio
Topic: Transmitter plant ambient temps?
Replies: 15
Views: 1970

Re: Transmitter plant ambient temps?

Semiconductor, electrolytics and fans all like room temp to be, well, room temp. Most fans, for example, are rated at a nominal 5 year life span at 40 degrees C. (104 deg F). For every 10 degrees C (18 deg F) that you decrease the temperature, the nominal life span doubles... so 10 years at 30 deg C...
by RFWarrior
Wed Apr 25, 2018 8:16 am
Forum: Ask the Engineers
Topic: Realistic Service Manual Request
Replies: 7
Views: 427

Re: Realistic Service Manual Request

Surprised me when I couldn't find it on SAMS website - I got the service manuals for both of my 70s vintage Zenith consoles from there... that said, if the STA-12 was sold in Canada, I was working at an Intertan repair depot around the time it was being sold. Let me hook up with the guy who did all ...
by RFWarrior
Mon Mar 26, 2018 9:48 am
Forum: Everything else
Replies: 3
Views: 819


Trying not to make a sales pitch, but if you're working on any of our current transmitters (NX series AM and GV, NVLT or VS series FM), there is a signal generator built in as well. You can choose type (sine wave, band limited noise or sine sweep), as well as level (as a mod percentage, 0-100), freq...
by RFWarrior
Wed Mar 14, 2018 7:01 am
Forum: FM Radio
Topic: Nautel V15 GE power supply failure
Replies: 4
Views: 795

Re: Nautel V15 GE power supply failure

They had a very high failure rate and were replacing them under warranty. Have you called? Some rumors never die... We had a high failure rate with earlier TECTROL/CUI supplies used in the NV series. The failure rate with the GE/Lineage supplies used in the GV and NVLT series has historically been ...
by RFWarrior
Wed Mar 14, 2018 6:48 am
Forum: AM Radio
Topic: ground strap thickness
Replies: 10
Views: 1114

Re: ground strap thickness

I had an electrical inspector recently require us to cut loose the connection between the transmitter reference ground and the service entrance panel ground. He said the service entrance can only be attached to a designated ground rod and nothing else. Your inspector was wrong. NEC 250.4 was revise...
by RFWarrior
Mon Feb 12, 2018 6:31 am
Forum: AM Radio
Topic: Audio Bandwidth of an AM Broadcast Station
Replies: 19
Views: 2604

Re: Audio Bandwidth of an AM Broadcast Station

ClearChannel / iHeartRadio stations seem to have been directed to go to 5 kHz bandwidth many years ago, and my annual Equipment Performance Measurement spectrums show that quite nicely. Pretty much any station running AM IBOC will be limiting analog audio to 5kHz - after several complaints of self-...
by RFWarrior
Wed Dec 20, 2017 8:38 am
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 26
Views: 2541

Re: RF Spectrum Analyzer

It is a regulatory agency within Canada, they are responsible for "Spectrum Management"; because of proximity to an airport, they are asking for more detailed scans. I'm thinking that the "2nd harmony" is referring to the second harmonic. I'd question this - Industry Canada has vans very well equip...