Search found 187 matches

by davek
Wed Jul 17, 2019 5:20 am
Forum: Ask the Engineers
Topic: Cutting Hard Line
Replies: 12
Views: 456

Re: Cutting Hard Line

I've had excellent results using a drop-saw with a non-ferrous metal cutting blade. Often the cut is so clean the end doesn't even need de-burring. Another advantage is being able to shave small amounts off the end, which you can't do with a pipe-cutting tool. This method was especially useful when ...
by davek
Wed Jul 03, 2019 6:17 am
Forum: Everything else
Topic: What's with all the spam lately?
Replies: 6
Views: 214

What's with all the spam lately?

I've noticed a there is a big increase in spam posts lately. Is it time to tighten the security screws on the forum a little more?
by davek
Sun Jun 09, 2019 11:24 pm
Forum: AM Radio
Topic: SX 2.5 Won't Power on No Lights
Replies: 10
Views: 484

Re: SX 2.5 Won't Power on No Lights

RodeoJack wrote:
Sat Jun 08, 2019 9:43 pm
a lot of troubleshooting depended less on technical knowledge and more on the common-sense approach
Nothing has changed in that regard..
by davek
Fri Jan 25, 2019 12:23 am
Forum: TV Engineering
Topic: 4K/60Hz HDMI DA that works?
Replies: 5
Views: 479

Re: 4K/60Hz HDMI DA that works?

Trying to send two 4K MVP outputs to two different control rooms. (total of four 4K monitors, two in each CR) I've tried three different HDMI splitters that claim to support 4K/60Hz but none work. (all the lights light up to indicate there's a cable there, but there's no video) They do need to driv...
by davek
Tue Dec 11, 2018 4:59 am
Forum: FM Radio
Topic: Harris Z FM Diagnostics Failing
Replies: 4
Views: 391

Re: Harris Z FM Diagnostics Failing

Can you check if all of your Z-Plane ISO temperature levels readings are normal? If you see any that are way off, or indicated as ##.# then you've probably got an issue with either the ribbon cables to the ISO board assembly, or the ISO assembly itself is faulty. There are a couple of things that ca...
by davek
Sat Nov 10, 2018 9:45 pm
Forum: Broadcast Engineering News
Topic: Tiger Mountain (WA) master antenna catches on fire
Replies: 21
Views: 2210

Re: Tiger Mountain (WA) master antenna catches on fire

No VSWR shutdown? Depends on what type of combining system is in use. In a balanced combiner system the TX won't see any VSWR mismatch coming from the antenna. I've always wondered why it's not common practice to monitor the VSWR of the combined output, where antenna faults can be detected and tran...
by davek
Sat Oct 06, 2018 6:29 pm
Forum: STL Engineering
Topic: RVR PTRL-LCD transmitter PS
Replies: 7
Views: 1029

Re: RVR PTRL-LCD transmitter PS

Nice find Dave! R4 on the main board is the start up supply resistor, so probably not ideal for measuring residual voltage stored in the main filter caps. In the past when I've worked on power supplies with no bleeder resistor across the main caps, I'll temporarily connect a 100W globe in parallel w...
by davek
Sat Oct 06, 2018 8:47 am
Forum: STL Engineering
Topic: RVR PTRL-LCD transmitter PS
Replies: 7
Views: 1029

Re: RVR PTRL-LCD transmitter PS

It might be custom built, but most certainly based on a fairly standard design. Good luck with it :)
by davek
Wed Oct 03, 2018 4:56 am
Forum: STL Engineering
Topic: RVR PTRL-LCD transmitter PS
Replies: 7
Views: 1029

Re: RVR PTRL-LCD transmitter PS

I've seen photos of this power supply and it doesn't look to be overly complicated. In the absence of a schematic I'd suggest a couple of things to try: 1. Check for any obvious problems on the primary side - open main fuse, shorted/open main rectifier, etc.. Also check the main switching FET, it sh...
by davek
Fri Sep 28, 2018 5:42 am
Forum: Everything else
Topic: Advice To Repair Power Antenna Cable
Replies: 4
Views: 413

Re: Advice To Repair Power Antenna Cable

Looks like a polystyrene film capacitor...
by davek
Fri Sep 21, 2018 5:34 am
Forum: FM Radio
Topic: TX + Bad Memory = Off Air
Replies: 10
Views: 1225

Re: TX + Bad Memory = Off Air

Nautel has a document (IS13004A) that details how to prepare a new compact flash card for the NV series. The recommended capacity for the CF card is 4GB.
PM me your email address and I can send you a copy.
by davek
Sat Jul 14, 2018 3:49 am
Forum: FM Radio
Topic: Remote Control Recommendcations
Replies: 13
Views: 921

Re: Remote Control Recommendcations

I would rate Statmon among one of the worst pieces of rubbish ever written.
by davek
Thu Jun 28, 2018 3:55 am
Forum: FM Radio
Topic: Mystery Socket in Radio Hut
Replies: 9
Views: 550

Re: Mystery Socket in Radio Hut

Wouldn't it be easier to cut the plug off and fit a NEMA 6-15 plug and receptacle instead?
by davek
Mon Jun 04, 2018 10:19 pm
Forum: Ask the Engineers
Topic: Burk Auto Pilot Win 10 display issue
Replies: 2
Views: 309

Re: Burk Auto Pilot Win 10 display issue

Did you ever figure out the file to delete?
I'm wondering if running in Windows 7 Compatibility mode might help too...
by davek
Sat Mar 17, 2018 4:41 am
Forum: AM Radio
Topic: GatesAir suspends AM TX sales (Radio World)
Replies: 33
Views: 2361

Re: GatesAir suspends AM TX sales (Radio World)

I think maybe it's time I relocate to the USA to open a switchmode PSU repair shop 8)