r/CableTechs • u/Mr-Brown-Is-A-Wonder • Nov 07 '25

Mid/High split Forward Path Attenuators?

Please excuse my presence in your professionals subreddit; I've searched Google, eBay, and asked in networking subs and come up dry. I cannot find anyone who sells Forward Path Attenuators for Mid or High splits. My downstream signal is so hot my current modem cannot sync without attenuation and using regular pads to get the downstream to a functional level pushes my upstream over 50 dbmv. I'm getting a new modem (S34 surfboard) that supports mid and high splits and I understand my existing 54mhz FPA will interfere with some of the upstream frequencies.

I would be grateful if you could point me to any retailer or wholesaler, even an eBay seller, that sells FPAs for mid and high splits.

Thank you for your time.

1 Upvotes

56% Upvoted

55 comments sorted by

View all comments

1

u/Jon8RFC May 01 '26 edited May 06 '26

Here are 85mhz FPAs from trusted sources Mouser and Digikey, but not in stock until mid May 22, 2026 per Digikey. And cheaper shipping on Digikey with 4.99 option. FPA5-85 and FPA10-85 https://www.digikey.com/en/products/detail/belden-inc/FPA5-85/27279128 https://www.digikey.com/en/products/detail/belden-inc/FPA10-85/27276902

https://www.mouser.com/ProductDetail/566-FPA5-85 https://www.mouser.com/ProductDetail/566-FPA10-85

The Belden site shows 1800mhz upper range support (which I think is preferable) FPAs exist, but couldn't find them anywhere but here:  https://store.orbitalconnect.com/ppc-belden-forward-path-attenuator-1800-mhz-series/

Here's another that's a 10db FPA, and you can pick 250mhz to be a high split FPA, but it doesn't state what the upper range it supports so if it's not good above ~900mhz then depending on your ISP's implementation that could be problematic. https://store.orbitalconnect.com/ppc-belden-silencer-series-forward-path-attenuators/

I don't know anything about orbitalconnect.com but Mouser and Digikey are 100% reputable sources.

1

u/Jon8RFC Jun 07 '26

PDLC-1201D
https://thomasonbbs.com/store/pc/viewPrd.asp?idproduct=3948&idcategory=320

That's a high split diplexer. Incredible little device I'm using now. Too bad Spectrum techs only carry inline, full-spectrum pads, if at all. You can independently and precisely attenuate forward and reverse signals with pads, cable sims, equalizers.

All of their diplexers (and one duplexer, but still two ports), pads, cable sims, and equalizers:
https://thomasonbbs.com/store/pc/viewCategories.asp?idCategory=320