Thank you for posting the photos. It is now clear what went wrong. You have used "diplexer" in place of "dc inserter/dc combiner". The diplexer has completely different function (separating/mixing two adjuscent frequency bands), while dc injector/dc combiner has another function (mixing/separating dc and a band of frquencies). These cannot be used in place of each other. You will have to replace the diplexers by the dc injectors/combiners.left photo: amplifier center, coax from DC blocking on L, coax to power inserter (black coax) on R
center photo: antenna (black coax) to DC block, white coax to amp LNB port
right photo: white coax on R from 14v power supply, white coax on L from amplif RCVR port, black coax on top to dongle
multimeter measures 15v + on center wire from DC power inserter
I'm using a 12 elements coax collinear...super donut@bramj:
Which antenna are you using?
The Spider, or any ¼ wave whip+groundplane of any type, has an apple or donut shaped radiation pattern (curve titled "Unity" in sketch below). This type of curvr gives high output dB for nearby planes, and very low output dB for far away planes.
A high gain antenna has a sqeezed apple or donut shape (curve titled "5dBd" in sketch below). This type of curve gives low output dB for nearby planes, and high output dB for far away planes, and hence is helpfull in crowded air traffic location like yours.
View attachment 1994
Wow, great antenna! Did you make it yourself or purchased it? If purchased, How many dB gain?
This will not work as dc inserter.Found this description of the DishTV attenuator online..hopefully this helps:
Dish Network 122698 10 dB UHF Signal Attenuator Pad Inline DC Block Female to Male F-Type 75 Ohm In-Line Fixed 22 Gauge Nickle Plated Coupler Connector 1 Pack, Part # 122698
This will not work as dc inserter.
This is an attenuator, and attenuates signal by 10 dB, so your DVB-T usb receiver will get no signal from antenna. It is therefore useless as dc inserter.
It will work as dc blocker, but since it eats up all signal due to its 10 dB attenuation, it is useless as dc blocker as well.
The first photo below shows how to make a DIY power inserter. The dc inserter has two components: an inductor and a capcitor.That's what I figured..will have to order a dc blocker
Just curious..is there anything that I could build that would substitute for the dc blocker?
Thanks ab cd
How were you able to remove the back of the splitter?
For the sake of those interested in making DC inserter:never mind
found another actual power inserter in my other junkbox and did the setup a la Dave...success!! Lots more planes than before for this late hour in Tucson
DIY project.Wow, great antenna! Did you make it yourself or purchased it? If purchased, How many dB gain?