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IP TV Set Top Box

Oct 23rd 2017, 12:14

K6IUZ

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I have 3 of these (Scientific Atlanta IPN330HD) in my new home....each one takes the noise floor on 20m from S2/3 to S9 when plugged in...it takes RF in and puts out HDTV...I had my rig on battery power to eliminate AC as being the path...
any recommendations to solve the problem?
Thanks
Tom Lewis
K6IUZ
73
Oct 23rd 2017, 12:39

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
From the Marlin P Jones Web site
MFG: DELTA
P/N: EADP-20DB A
Input: 100-240 VAC 50/60Hz
Output: 12VDC @ 1.67A
For use with Scientific Atlanta Model IPN330HD

You might try wrapping the input and output of the adapter through a large toroid to choke of the RF. Alternately, if may be possible to replace the switching supply with a quiet linear supply.

But, the noise can also be generated by the set top box, so testing is in order before deciding on a fix.

Zack W1VT
ARRL Senior Lab Engineer
Oct 23rd 2017, 17:13

K6IUZ

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Thanks Zack...just did a test....
With the:
1) provided wall supply S peaking 9
2) 12vdc AGM battery S peaking 2/3
3) provided wall supply wirh a hefty torroid S peaking 4/5
I am embarrassed to say but I'm shocked...looks
like all I need is clean 12vdc...
Time to look for a source of linear supplies...
Thanks again...
73


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