Roy Trumbull - Editor
Bill Dempster - Artist

This month our speaker will be Daniel Taylor of Daniel Taylor & Assoc., Architects. The topic will be "Designing the Digital Information Factory". Photos of actual construction and systems installations will be shown. Recently they created the prototype digital television station for the News Corporation.

As usual our luncheon will be at Sinbad's. Sinbad's is just south of the Ferry Building on the Embarcadero near the foot of Mission Street. Please RSVP to Karen Prasek at Zack's: 408-324-0551 x126 asap; we've been running out of tables and chairs. We meet at 11:30 and are seated at 12:30.

March 25th – Mark Haynes of Leo's Pro Audio on the LightHouse digital audio switcher.

Not Music Television, mystery television. We still don't know what 8VSB is despite the graphics in the various magazine articles whose author's jobbed them all from the ATSC notes. I wrote Brad Dick to ask him what the unlabeled vertical axis was in a recent article on 8VSB. No one really knows. I cornered a Zenith engineer at the recent CES show and asked him what Q was in their system. He admitted that a Q signal was created but that the system didn’t use it. He also said that the trellis coding was a PC decision that actually costs the system some of its operational margin.

The pre-distortion of the signal, to make it fit into the FCC mask, takes place in the 8VSB modulator. Don't look in the published block diagrams. Instead, Place your hand on the ASTC test report and smile proudly into the rising sun. Also, filling a slot in the modulator, is a circuit that can mimic the delay characteristics of the channel filter. No peaking. (You'd better bet your sweet tweaker there is.)

Have a nice bandwidth.

I put a fresh roll of paper in my TFT 911 on 12/30 and it ran out by 2/7 and we had to load another. From 2/2 to 2/8 I counted 28 Alerts that KRON forwarded including three that were for immediate evacuations. Several were from KQED and didn't come in as duplicates so we ran them. One was from the NWS radio. By the time it made it through KQED's box and our box, it was pretty well trashed. I had some viewer comments on that one.

We use a CODI in master control that can be loaded with text by the news dept.. They got to be real good at picking off the NWS wire copy and pasting it. Often it was loaded and ready prior to KCBS kicking off the party.

While I've said that if KCBS don't play the music, we won't dance, we also groove to KQED's Eine Kleine EAS musik.

I said something nice about him and the phone rang. Actually Jim was lamenting that there are so few of us pre-stereo guys around who remember what it was like in the days before the entire dial got its check cut by the same corporation. Jim recalled some of the call letters I'd asked about. KNBR-FM was 99.7. The original owner of 97.3 was KWBR in Oakland which predated KDIA. KCBS on the Clay - Jones Apt. Building was 98.9. I have a dim memory that that frequency may have gone on the air as KJBS-FM. Jim remembered that the 94.1 slot occupied by KPFA was originally a commercial station with the call letters KSFH. And going through some old files I found that KRON-FM was 96.5.

Another Gabbert story has to do with a directional antenna that I believe engineering legend Al Eisberg designed for (then) KNBC-FM. It was in the bone yard up a San Bruno and Jim recognized it for what it was and adapted it for KPEN. He was authorized for 120KW in the major lobes before the blue meanies came up with the "new rules" in the early 60s.

Done Your ULS Filing?*
Late last year I got several letters from the Wireless Bureau re filing call letters along with a taxpayer ID. I didn't think much of it as I thought it was related to a CEL site in Arizona that we'd sold to Bell Atlantic. A few weeks ago I got 8 more letters all with the same content. Wireless is handling all of the licenses for Broadcast Aux and it appears they want them all associated with a taxpayer ID.

What makes this a little sticky is that there is one call letter file per taxpayer ID. If there are a number of stations in a group with a common EIN (employer identification number), then all the calls have to be gathered and uploaded at one time. You can upload a plain text file with one call letter per line. I've done a little more extensive article on this topic. It's on our Web page.

*(does not mean unidentified lingerie sighting)

The chapter 40 web page is at and is maintained by Tim Pozar.

The keeper of the chapter 40 email address list is Warren Reese his address is Please note the new email address.

Warren worked for the KPH in Bolinas which was one of the last coastal Morse sites. He has photos of KPH on his web page at