Subscribe to EDN

Thin-Air ATSC: The Only Constant Is Change For Me

March 11, 2010

Has it really been nine months since I last wrote about my longstanding travails at striving to obtain reliable ATSC reception? That’s because until recently, I happily had a stable Windows Media Center setup. Granted, reception would sometimes go temporarily awry, if heavy snow accumulated on one or both antennas, or if inclement weather between the Verdi, NV translator transmission antennas and my residence resulted in unacceptable signal attenuation. But occasional (and explainable) hiccups aside, I was able to reliably snag signals coming from nearby Reno, NV’s major broadcasters…

…until a few weeks ago, that is. That’s when I found myself no longer able to consistently tune in KOLO (ABC), and my ability to receive either KTVN (CBC) or KNPB (PBS) completely ceased. In all three cases, I was attempting to tune in the secondary translator signals coming from Verdi, NV’s Peavine Peak antenna cluster, which historically had been more robust than the Reno, NV primary transmissions. Last night, I finally got around to doing a broadcast frequency scan using the combination of my MSI Wind U100 netbook and a Pinnacle Systems PCTV HD mini Stick. The results were interesting, to say the least.

As my Windows Media Center experiences had suggested, KOLO’s translator beacon was extremely weak, KNPB’s was virtually undetectable, and KTVN’s was nonexistent. I’m not sure what’s going on at Peavine Peak, since I’m still able to tune in KRXI’s transmission from that location just fine. Then again, KRXI’s signal is substantially stronger than that of its translator neighbors, and it’s omni-directional as well. But fortunately, I seem to now have another reliable option for getting both KOLO and KTVN: the primary antennas located on Slide Mountain.

For KTVN this wasn’t much of a surprise; I’d always been able to tune in the Slide Mountain primary transmission, and I’d only been using the Peavine Peak translator because its signal was historically a bit stronger. But KOLO was a shocker; long-time readers of this particular topic series know that I’ve never been able to receive it before. The ATSC signal was originally (and briefly) on UHF channel 23; it subsequently moved to VHF channel 9. Once KOLO shut down its VHF channel 8 NTSC beacon last mid-June, the ABC affiliate moved its ATSC signal there in conjunction with doing some equipment upgrades.

My initial reception testing of KOLO’s ATSC signal on VHF channel 8 was unsuccessful, therefore my continued reliance on the UHF channel 24 translator, but perhaps the broadcaster has done antenna and other enhancements since then. KOLO’s VHF channel 8 beacon is still weaker here than those of its KTVN and KRNV (NBC) Slide Mountain neighbors, but TV Fool statistics suggested that this would always be the case. And I’m still unable to tune in KNPB until the Verdi translator on Peavine Peak is resurrected to its prior robustness; KNPB’s primary antenna on Red Mountain is several thousand vertical feet below and on the other side of the formidable Mt. Rose range and therefore unavailable to me. But I’ve now got ABC, CBS, Fox and NBC back, so I’m reasonably happy.

By the way, in reconfiguring Window Vista’s Media Center application last night, I was happy to see that the issues I experienced last June have seemingly corrected themselves. Media Center no longer suggests, after I enter my zip code, that I should be able to receive Sacramento-area broadcasters a two-hour drive and many Sierra Nevada mountain ridges away. And Media Center also now correctly identifies KOLO’s primary ATSC signal as being on VHF channel 8.

And while I’m discussing ATSC reception, I’ve got an update for you on the Kitz Technologies’ KT-100VG signal booster that I mentioned last August. The initial unit, as I mentioned back then, abruptly failed. Its replacement is still working fine. And after I sent back the original device for diagnostics testing, here’s what Jeffrey Kitz found:

The GasFET amplifier IC was defective. No way to tell why. It could be just a part failure or a touch of lightning?

Posted by Brian Dipert on March 11, 2010 | Comments (5)

March 11, 2010
In response to: Thin-Air ATSC: The Only Constant Is Change For Me
Brian Dipert commented:

Dear Tim, Glad to hear Jack finally retired. Here's my contact info: www.edn.com/index.asp?layout=siteInfo&doc_id=28982 Looking forward to a site visit whenever our respective schedules allow


March 11, 2010
In response to: Thin-Air ATSC: The Only Constant Is Change For Me
Timbalionguy commented:

I would be happy to come up there with test equipment, both now and after we get the translator on site. Of course, you are welcome to come down to the station sometime as well. Just call the station 775-784-4555 and ask for Timba. (Long story on the nickname!) BTW, I have known Jack Antonio from before I moved to Reno 10 years ago. He just retired a few weeks ago. And as far as sharing broadcast practices and war stories, I could be talked into that!


March 11, 2010
In response to: Thin-Air ATSC: The Only Constant Is Change For Me
Andy T commented:

LOL - there you go Brian. You now have awesome support for the only station on your list that's worth receiving. FWIW, that's one of the best writeups and explanations of a field setup I've seen {Tim's not yours :-) } Maybe you should try to talk Tim into contributing a piece or two for the EDN print mag. War stories, practices, rules of thumb, conversion to digital, and field practices for TV transmission, would be an interesting read.


March 11, 2010
In response to: Thin-Air ATSC: The Only Constant Is Change For Me
Brian Dipert commented:

Dear Tim, Thanks everso for writing! Swing on by sometime if you'd like to do on-site testing; I'm only a half-hour drive from Reno. Jack Antonio (KTVN), I think, found his time here valuable last summer


March 11, 2010
In response to: Thin-Air ATSC: The Only Constant Is Change For Me
Timbalionguy commented:

Part of the problem with receiving the Verdi translators might be the extremely high ERP of KRXI. Located at the top of Peavine on channel 44, they are an RF blowtorch! They could be desensing your receiver front end for the other translators. Also, the antenna for the Peavine translator site is common to all the translators, and is directionalized for Verdi. I am very interested to know exactly what you are experiencing with KNPB? Weak signal? Or, unreliable reception? One trick is to try entering the RF channel into your receiver. The RF channel is 47, and you use the MPEG service number of one of the services: service 3 corresponds to 5.1 virtual. (Service numbers 1 and 2 are reserved for satellite services) So, try 47-3. You might also consider a 1/4 wave stub trap for KRXI, centered at 653 MHz. As for KOLO (8), KRNV (13) and KTVN (7), KRNV and KTVN are colocated on a single tower that is a bit taller than KOLO. I think they are also using a broadband traveling wave antenna. KOLO uses a 'batwing' superturnstile design, is a bit shorter, and is located further in (from you) on the peak of Slide Mountain. The slight difference in location and antenna pattern can make a big difference in reception in your very mountainous terrain. Finally, KNPB will be installing a translator on Relay Peak as soon as the weather is good enough to allow access into the site. This should help reception tremendously. Tim Stoffel Assistant Chief Engineer (and a regular reader of your column) KNPB TV

POST A COMMENT
Display Name
captcha

Before submitting this form, please type the characters displayed above. Note the letters are case sensitive:

Advertisement
Advertisement
Advertisement
About EDN   |   Site Map   |   Contact Us   |   Subscription   |   RSS
© 2012 UBM Electronics. All rights reserved.
Use of this Web site is subject to its Terms of Use | Privacy Policy

Please visit these other UBM Canon sites

UBM Canon | Design News | Test & Measurement World | Packaging Digest | EDN | Qmed | Pharmalive | Appliance Magazine | Plastics Today | Powder Bulk Solids | Canon Trade Shows