Search found 20 matches

by maarkotech
Mon Jun 27, 2016 1:14 pm
Forum: FM Radio
Topic: 5.5KW DB FM TX WITH DTS 30 EXCITER
Replies: 1
Views: 309

5.5KW DB FM TX WITH DTS 30 EXCITER

HELLO every one, is anybody familiar with this transmitter? WP_20160625_17_29_20_Raw_LI[1].jpg The owner said the tx was shutdown, when they wanted to power it on the following day, the tx refused to go on air, before they called me to help, but im nt too familiar with the make, but using my basic k...
by maarkotech
Mon Jun 20, 2016 1:42 pm
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

The motor driven pot that controls power is moving , i have checked it over and over while, pressing the raising and lowering buttons. so i dont think thats is the problem, but i will shutdown the exciter and remove the tube as you said, and power the tx to see if the plate voltage will increase whi...
by maarkotech
Sat Jun 18, 2016 2:59 am
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

i have tried hiting all the relays but still no difference, i have changed the gating cards and even the SCRs still no difference, the only thing left is the tube,
by maarkotech
Mon Jun 13, 2016 4:09 pm
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

its connected to the antenna, no warning light, all the light are green meaning everything is fine, but im going to change the gating cards, and SCRS and see the result.
by maarkotech
Mon Jun 13, 2016 1:09 pm
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

ok, raising and lowering the power does not change anything. i can hear the power control motor moving behind but it doesn't change anything.
by maarkotech
Mon Jun 13, 2016 10:08 am
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

the filament voltage is fine, still at 6v
Are you saying i should remove the tube and power up the tx? then raise and lower the power to check if plate and screen volts changes accordingly?
by maarkotech
Mon Jun 13, 2016 3:51 am
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

the TX is in manual mode, i have tried retuning, with no changes in the output, i have tested the three gatin cards one after the other still, no changes, could it be the tube is dead. another thing i noticed if you power up tx imediatly i press the plate button to start the tx, the plate voltage wi...
by maarkotech
Sat Jun 11, 2016 9:55 am
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

hello, i have changed the IPA and im getting a good output from the exciter and IPA, below are the current reading the final output is below 5%, and its not increasing P.A PA SCREEN CURRENT:50ma PA SCREEN VOLTAGE:80VOLT PA GRID CURRENT: 50ma plate voltage: 1kv plate current: 0.3A EXCITER FORWaRD PWR...
by maarkotech
Fri Jun 10, 2016 11:34 am
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

awsherrill wrote:Dumb question time...is the power control turned (almost) all the way down?
no, the transmitter will come on , with that readings, no warning led of any sort
by maarkotech
Thu Jun 09, 2016 11:50 pm
Forum: FM Radio
Topic: Trouble with a Continental 816R-2B IPA re-fit
Replies: 38
Views: 2797

Re: Trouble with a Continental 816R-2B IPA re-fit

pls can some body help with me, continental fm tx 21.5kw, When Tx was powered, the exciter started working fine, but the forward power of the tx remain at zero. -No warning light, all the green lights are ON, but still the final ouput is zero watt. below are the readings taken while the tx was runni...
by maarkotech
Wed Mar 04, 2015 3:28 am
Forum: FM Radio
Topic: 21.5kw continental fm transmitter
Replies: 10
Views: 1293

Re: 21.5kw continental fm transmitter

relay.jpg
Funny enough i checked those relay before, mere looking at them everything looks aright, but on removing and testing exposed the fault, attached are the relays
by maarkotech
Mon Mar 02, 2015 2:35 am
Forum: FM Radio
Topic: 21.5kw continental fm transmitter
Replies: 10
Views: 1293

Re: 21.5kw continental fm transmitter

thanks all, warning finally cleared, the overload relays are the culprits, shorts across normally opened contacts, i burned off the resistance with 12v cross, the warning was immediately cleared after installing them back.
by maarkotech
Wed Feb 25, 2015 2:17 am
Forum: FM Radio
Topic: 21.5kw continental fm transmitter
Replies: 10
Views: 1293

Re: 21.5kw continental fm transmitter

thanks so much, were is the reflected element in the output directional coupler located i have checked the jumpers on the tx from the directional coupler at the output, i cant really figure out the reflected element i have also checked the manual but there is no direct explanation
thank you
by maarkotech
Fri Feb 20, 2015 1:16 pm
Forum: FM Radio
Topic: 21.5kw continental fm transmitter
Replies: 10
Views: 1293

Re: 21.5kw continental fm transmitter

ok
by maarkotech
Wed Feb 04, 2015 6:39 am
Forum: TV Engineering
Topic: Video feed to Analogue R&S TV TX
Replies: 1
Views: 858

Video feed to Analogue R&S TV TX

Please can anybody help with this, i feed video & audio signals from a panasonic AV mixer to an image engine then from the image engine to the TX in analogue format, but i have been battling with HUMs on the tv video ouput. i have tried in taking power all from one UPS, i have shorten the distance b...