[Repeater-Builder] Re: Building Low Band Loop Antennas (DB-212)
Skipp, Here's the WA1ZDX info www.ccdx.org/zedyx/mods/db212.htm Actually this one is on Repeater Builder http://www.repeater-builder.com/db/db-212-assembly-and-mounting-instructions-(andrew).pdf Spec from Andrew on the DB212 http://www.stealth.ae/plugins/custompages/detinf.php?id=322id_categories=115 More Andrew info http://www.hol4g.com/webpdf/DBB_CAT29-PG318-319_01.PDF Info on modifying a DB201 and DB212 for 10 and 6 meters http://www.xanaduu.com/db201/ Ken WA6OSB
[Repeater-Builder] Re: Building Low Band Loop Antennas (DB-212)
Dave, I found some info on DB212 cable lengths doing a Google search. A website by WA1ZYX has a couple of pages on modifying the DB212 for 6 meters and also cable lengths/matching and spacing of the folded dipoles. No info on changing element spacing from tower leg. This could affect the pattern. Also found a 4 page article by Decibel Products titled DB212 Series. Good info on antenna patterns. BTW, I've got a NOS DB225 cut for 75.70 MHz. This is like a DB212 with a director. It's got all the measurements for spacing for director, etc so this probably will be critical. I was thinking of trying to extend the elements for 6 meters. Has anyone done this on a DB225? Ken WA6OSB
Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work
Good grief folks, how difficult is this? Checkout the website site below. For example: in San Diego it shows KPBS as channel 15-1. Click on the call letters. It shows channel 15, the former analog channel and what it still is identified as.. Then it shows (RF 30), that's the channel it's on in the digital transition, but it identifies as Channel 15-1. The nice map also shows where the transmitter is located and a engineering SWAG as to the signal level to expect. The Digital TV Transition: DTV Reception Maps http://www.fcc.gov/mb/engineering/maps/ Ken - Original Message - From: JOHN MACKEY To: Repeater-Builder@yahoogroups.com Sent: Friday, March 06, 2009 12:41 PM Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work What is the callsign of the (ch. 7) station we are talking about? -- Original Message -- Received: Fri, 06 Mar 2009 12:35:36 PM PST From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work The same. - Original Message - From: JOHN MACKEY jmac...@usa.net To: Repeater-Builder@yahoogroups.com Sent: Friday, March 06, 2009 3:28 PM Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work What frequency was channel 7 digital and frequency channel 7 analog? -- Original Message -- Received: Fri, 06 Mar 2009 08:12:39 AM PST From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work Paul Plack wrote: Jim, You might want to READ IT AGAIN yourself. Here's where the misunderstanding started. John wrote that if the digital is on a very different frequency, reception may be different. Your response was that if your antenna worked on one, it should work on the other, Period. You appeared to have a misunderstanding. Don't get mad at people who try to help. That's kinda why this place exists. No, that's not what I said. I said that if an antenna works on CH7 analog, it should work on CH7 digital, and if it doesn't, the problem is the source. Yahoo! Groups Links
Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work
Want to get more confused? And more OT? HD radio (does NOT mean High Definition). I think it's Hybrid Digital. They have channels with -1 -2 which essentially is the digital sidebands that can contain different programming. HD radio is causing all kinds of interference problems, especially with night time DX. They would have been better off going to DRM. Of course that would not be compatible with existing AM. If we ever get the 76-88 MHz range for broadcast, DRM would work well there. Ken - Original Message - From: MCH To: Repeater-Builder@yahoogroups.com Sent: Friday, March 06, 2009 19:48 PM Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work You know, I just though of another example that needs 'fixed'. My local Channel 2 is on RF channel 2 on the cable system (a mistake, I'm sure). 4 is on 3, 11 is on 12, 53 is on 7, 22 is on 10, and 13 is on 9. If people can understand that the channel name isn't always the channel number on the cable systems, why can't they understand the same will now be true for DTV where 2 is on 25, 4 is on 51 and 11 is on 48??? It seems that the main source of the confusion is the alias that shows 02-1 rather than 25-1. The very item designed to avoid confusion seems to be the cause. Maybe we should just make it easy and make them use their callsigns again so you can know WTAE is on OTA Channel 4 (STD), OTA Channel 51 (DTV), and 3 (STD) or 210 (DTV) on cable? BTW, KPBS is on OTA Channel 15 (STD) and Channel 30 (DTV). It may show 15-1 as an alias, but it's RF Channel 30 for the DTV signal. Joe M. MCH wrote: You know, I was doubting the arguments posed by the government, but I'm starting to think they were right. It's just too much for the consumer to grasp DTV as it currently sits. I mean, if a *technical* bunch like this can't understand how a channel 2 station can be on RF channel 25, what hope is there for the consumer? Maybe it should be postponed indefinitely until the stations all get their original channels back or they simply change they logo from Channel 2 to Channel 25 and forget this alias XX-Y channel format. Joe M. Ken Decker wrote: Good grief folks, how difficult is this? Checkout the website site below. For example: in San Diego it shows KPBS as channel 15-1. Click on the call letters. It shows channel 15, the former analog channel and what it still is identified as.. Then it shows (RF 30), that's the channel it's on in the digital transition, but it identifies as Channel 15-1. The nice map also shows where the transmitter is located and a engineering SWAG as to the signal level to expect. The Digital TV Transition: DTV Reception Maps http://www.fcc.gov/mb/engineering/maps/ Ken - Original Message - *From:* JOHN MACKEY mailto:jmac...@usa.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Friday, March 06, 2009 12:41 PM *Subject:* Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work What is the callsign of the (ch. 7) station we are talking about? -- Original Message -- Received: Fri, 06 Mar 2009 12:35:36 PM PST From: Chuck Kelsey wb2...@roadrunner.com mailto:wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work The same. - Original Message - From: JOHN MACKEY jmac...@usa.net mailto:jmackey%40usa.net To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Friday, March 06, 2009 3:28 PM Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work What frequency was channel 7 digital and frequency channel 7 analog? -- Original Message -- Received: Fri, 06 Mar 2009 08:12:39 AM PST From: wd8chl wd8...@gmail.com mailto:wd8chl%40gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work Paul Plack wrote: Jim, You might want to READ IT AGAIN yourself. Here's where the misunderstanding started. John wrote that if the digital is on a very different frequency, reception may be different. Your response was that if your antenna worked on one, it should work on the other, Period. You appeared to have a misunderstanding. Don't get mad at people who try to help. That's kinda why this place exists. No, that's not what I said. I said that if an antenna works on CH7 analog, it should work on CH7 digital, and if it doesn't, the problem is the source
Re: [Repeater-Builder] Re: OT: Radios and Coms in TV and Movies
Since we're talking about old radios, does anyone remember the West Coast Electronics Model MFM-15-150B? That's what got 2m FM going in San Diego in the early '60s. We bought a bunch of these from the Yellow Cab Co. when they upgraded to Motos. I'm working on a history of early FM in San Diego County and would like to find a picture of one of these units. Both inside and out. Thanks, Ken WA6OSB - Original Message - From: JOHN MACKEY To: Repeater-Builder@yahoogroups.com Sent: Saturday, January 17, 2009 13:28 PM Subject: Re: [Repeater-Builder] Re: OT: Radios and Coms in TV and Movies I had one of the Sonar FM radios that I bought for $20 already crystalled up on 29.6 MHz in about 1985. I ran if for a base station for a couple years, the squelch action was not the best. Eventually, I upgraded to a Mocom 70 base! -- Original Message -- Received: Sat, 17 Jan 2009 11:21:55 AM PST From: w7...@comcast.net To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: OT: Radios and Coms in TV and Movies Hello Group, I have a couple of the Silver Grill E.F. Johnson Business Band tube type radios from the 60's. They are AM, and about 8 watts out. They are a Twin to the CB set Johnson produced around the same time. Also don't forget about Sonar brand. They produced a low band business transciever (AM) with matching power amplifier. I am happy there is still an interest in the preservation of these Boat Anchors When they are gone.they are gone forever! They do bring a smile to many folks, and that's what counts. I don't know what ever populated the part 15 49 mHz. band, after the cordless phones changed frequency. Seems like a waste, if no one is active. 73's de Tim Hardy W7TRH Vashon Is. Wa. -- Original message -- From: Joe k1ike_m...@snet.net Someone supposedly converted 2 of these radios into a repeater years ago. Hooked up the audio leads and swapped transmit crystals so they were on 2 different freqs. They did the same in the HT's that they talked to it with. Early budding hams, I guess. Joe w7...@comcast.net wrote: Hi Gang, Don't forget the Part 15 channels on 49 mHz. There were at least (3). Power limit was 100 mw. I still have a few Sears walkie-talkies of that type (late 70's) I think they are AM? Always thought about upping power(-: When Skip was in it was an interesting band. The channels were differnt that the old cordless that are on 49 mHz. Tim Hardy W7TRH Wa.
[Repeater-Builder] Are you ready for narrowbanding? | FCC requires systems transition from 25 KHz to 12.5 KHz channels
Obviously this requirement does not apply to Amateur Radio, but amateur repeater coordinators for densely populated areas, i.e. Southern California, NY-NJ and other areas would do well to start thinking about this looming situation. Have you tried to get a 2 meter or 440 MHz repeater coordinated lately? http://urgentcomm.com/policy_and_law/commentary/narrowbanding-migration-1209/ P.S. There are some good links at the bottom of this article. Ken WA6OSB
