home *** CD-ROM | disk | FTP | other *** search
- Date: Sun, 10 Apr 94 14:40:30 PDT
- From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu>
- Errors-To: Info-Hams-Errors@UCSD.Edu
- Reply-To: Info-Hams@UCSD.Edu
- Precedence: Bulk
- Subject: Info-Hams Digest V94 #400
- To: Info-Hams
-
-
- Info-Hams Digest Sun, 10 Apr 94 Volume 94 : Issue 400
-
- Today's Topics:
- 73
- Anyone Bicycle Mobile?
- Delivery Failure Report
- EME + PC + ROTATOR
- FCC Delays (2 msgs)
- how's FM broadcast for freq. standard? (3 msgs)
- Logging program for Macintosh
- Low cost antenna required
- Q: ICOM ICM 700
- SAREX Update & Keps 4/10/94
- Undeliverable Message
- WWV Antennas (2 msgs)
-
- Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
- Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
- Problems you can't solve otherwise to brian@ucsd.edu.
-
- Archives of past issues of the Info-Hams Digest are available
- (by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".
-
- We trust that readers are intelligent enough to realize that all text
- herein consists of personal comments and does not represent the official
- policies or positions of any party. Your mileage may vary. So there.
- ----------------------------------------------------------------------
-
- Date: 10 Apr 1994 16:11:02 -0400
- From: elroy.jpl.nasa.gov!swrinde!gatech!news.ans.net!hp81.prod.aol.net!search01.news.aol.com!not-for-mail@ames.arpa
- Subject: 73
- To: info-hams@ucsd.edu
-
- In article <gregCnqKAn.KIy@netcom.com>, greg@netcom.com (Greg Bullough) writes:
-
- >Who careses anyways????
- Maybe your English teacher!
-
- 73sss de John KA3DBN
-
- ------------------------------
-
- Date: 10 Apr 1994 10:06:13 GMT
- From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!noc.near.net!news.delphi.com!gilbaronw0mn@network.ucsd.edu
- Subject: Anyone Bicycle Mobile?
- To: info-hams@ucsd.edu
-
- >I hope to be bicycle mobile on 2 meters this summer. Any suggestions on
- >equipment and antennas would be most welcome.
- >--
- >Michael J. Malloy Amateur Radio N9WJV
- >Medical College of Wisconsin Compuserve 70334,3563
- >Milwaukee, Wisconsin Internet mmjjmm@post.its.mcw.edu
- >
- >
-
- I used to use a 5/8 mounted on a plate on a rear carrier. It worked quite
- well. You will need a large batter for power or your time will be linited.
- I would get one of the vox capable hts and you are going to have fun
- getting a headset to work with a helmet. It is a blast though. It tests
- your conditioning too. My voice would change a little into the wind up a
- hill. :-)
- Gil Baron, El Baron Rojo, W0MN Rochester,MN
- "Bailar es Vivir"
- PGP2.3 key at key servers or upon request
-
- ------------------------------
-
- Date: 10 Apr 94 16:53:08 GMT
- From: news-mail-gateway@ucsd.edu
- Subject: Delivery Failure Report
- To: info-hams@ucsd.edu
-
- From: NAME: Mail Postmaster
- FUNC:
- TEL: <POSTMASTER AT A1 AT ANDV02>
- To: net%"Info-Hams@UCSD.EDU"@RCVAX@MRGATE
-
-
- ALL-IN-1 was unable to deliver your message dated to
- ADAMS,SE - no such ALL-IN-1 account
- on node ANDV02
-
- The subject of the message was :
- Info-Hams Digest V94 #399
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 19:16:13 +0000
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!pipex!warwick!uknet!demon!kanga.demon.co.uk!dick@network.ucsd.edu
- Subject: EME + PC + ROTATOR
- To: info-hams@ucsd.edu
-
- Hi Gang,
- I have a PC and a pair of K400 rotators
- (ele + az) looking for some software
- do drive these for EME work, any ideas?
- TTFN
-
- ------------------------------
-
- Date: 10 Apr 1994 20:47:22 GMT
- From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!howland.reston.ans.net!darwin.sura.net!blackhole.delmarva.com!blackhole.delmarva.com!news@network.ucsd.edu
- Subject: FCC Delays
- To: info-hams@ucsd.edu
-
- Anyone have a feel for how long licenses take to get from FCC Gettysburg?
- Last I heard it was 10 weeks :-(
-
- I passed my Tech this morning ( and bought some code practice stuff :-)
- The VEC said (jokingly, I hope!) that I could be up to 20 wpm by the time
- I see a license.
-
- - John
-
- ---
- +---------------------------------------------------------------------+
- | John K. Scoggin, Jr. Email: scoggin@delmarva.com |
- | Supervisor, Network Operations scoggin@ee.udel.edu |
- | Delmarva Power & Light Company Phone: (302) 451-5200 |
- | 500 N. Wakefield Drive NOC: (800) 388-7076 |
- | Newark, DE 19714-6066 Fax: (302) 451-5321 |
- | The opinions expressed are not those of Delmarva Power, simply the |
- | product of an over-active imagination... |
- | Time is Nature's way of preventing everything from happening at |
- | once. |
- +---------------------------------------------------------------------+
-
- ------------------------------
-
- Date: 10 Apr 1994 21:26:55 GMT
- From: ihnp4.ucsd.edu!swrinde!gatech!howland.reston.ans.net!vixen.cso.uiuc.edu!cesn5.cen.uiuc.edu!mf10991@network.ucsd.edu
- Subject: FCC Delays
- To: info-hams@ucsd.edu
-
- scoggin@delmarva.com (John K Scoggin Jr) writes:
-
- >Anyone have a feel for how long licenses take to get from FCC Gettysburg?
- >Last I heard it was 10 weeks :-(
- >
- >I passed my Tech this morning ( and bought some code practice stuff :-)
- >The VEC said (jokingly, I hope!) that I could be up to 20 wpm by the time
- >I see a license.
-
- > - John
-
- >---
-
- Good Luck! I took my exam back on Feb. 12 in central Illinois hoping to
- get my callsign by Hamvention (Last weekend in April). I have heard recently
- that some ppl have waited up to 13 wks for there callsign.
-
- Still hoping to get it in time
-
- ------- Melissia
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 14:24:33 GMT
- From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!emory!rsiatl!ke4zv!gary@network.ucsd.edu
- Subject: how's FM broadcast for freq. standard?
- To: info-hams@ucsd.edu
-
- In article <CnyI2B.2y7@icon.rose.hp.com> lkraft@core.rose.hp.com (Lyle Kraft) writes:
- >
- > Unless someone can correct me, I believe FM broadcast is allowed
- > +/- 2KHz. Same for broadcast TV audio/video. AM broadcasters are
- > allowed +/- 20Hz. Nowadays with the availability of cheap, accurate
- > freq. counters I'm sure they're all much closer than this.
-
- No, it's half that amount. FM and TV tolerance is +/- 1000 Hz, AM is
- +/- 10 Hz. As to your latter comment, don't bet on it. The rules now
- only require checking frequency once a month.
-
- Gary
- --
- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | |
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 14:19:17 GMT
- From: ihnp4.ucsd.edu!swrinde!emory!rsiatl!ke4zv!gary@network.ucsd.edu
- Subject: how's FM broadcast for freq. standard?
- To: info-hams@ucsd.edu
-
- In article <CnyGzK.7o8@srgenprp.sr.hp.com> alanb@sr.hp.com (Alan Bloom) writes:
- >Tom Randolph (randolph@est.enet.dec.com) wrote:
- >
- >:I just acquired one of the Optoelectronics 1200 MHz handheld freq counters. In
- >:looking for a simple, cheap way to calibrate it, I note that it picks up the
- >:nearby FM broadcast station as 107.2999 MHz when I connect a rubber duck. how
- >:close can I assume those guys are? The way the counter is set up, the higher
- >:the standard freq, the better your calibration. Zero-beating WWV won't get me
- >:as close as something less definitive at 100 MHz or higher.
- >:-Tom R. N1OOQ randolph@est.enet.dec.com
- >
- >Why not call up the broadcast station and ask them? Ask to speak to the
- >chief engineer.
-
- He probably won't know. Ask for the operator on duty, he can give you
- moment by moment readings off his display, if he still has one. Note
- that FM broadcasters only have to maintain a tolerance of +/- 1000 Hz from
- their assigned frequency. Note also that their assigned frequency may
- have up to a 10 kHz offset from normal channel center if they're close
- spaced with another station. So *ask* what their nominal carrier frequency
- is, don't assume its the nominal channel center.
-
- The same goes for TV broadcast. Note too that we aren't required to
- maintain a Type Accepted frequency monitor anymore, and only have
- to have our transmitters checked once a month for compliance to the
- +/- 1000 Hz rule, sometimes with an Opto counter. :-(
-
- Go with zero beating WWV.
-
- Gary
- --
- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | |
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 14:31:34 GMT
- From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!emory!rsiatl!ke4zv!gary@network.ucsd.edu
- Subject: how's FM broadcast for freq. standard?
- To: info-hams@ucsd.edu
-
- In article <244@ted.win.net> mjsilva@ted.win.net (Michael Silva) writes:
- >In article <2o4h56$ijo@agate.berkeley.edu>, Ken A. Nishimura (kennish@kabuki.EECS.Berkeley.EDU) writes:
- >>
- >...stuff deleted...
- >
- >>Most FM stations use a FLL to keep their transmitters on frequency by
- >>dividing their output frequency by some factor and comparing that
- >>with a known accurate lower frequency reference. Note that dividing
- >>a FM signal also divides the deviation index by the division ratio.
- >>Thus, by dividing by 5 or so, the FM signal can be guaranteed not
- >>to exceed a deviation of 2.405, and the carrier never disappears and
- >>will always be of proper phase, assuming that the signal corresponds...
- >>
- >
- >You're not saying they use their *modulated* signal as the input to
- >their frequency comparator, are you? That would cause the carrier to to
- >re-modulate itself to cancel out it's original modulation as it tried
- >to stay on center frequency! If you tried to pick out just the
- >carrier in a divided-by-five signal you'd need a bandwidth of less than
- >10Hz (at approx. 20MHz), and, dividing or not, you'd end up with a
- >uselessly small capture range.
-
- No. All you need is a low pass filter in the PLL error loop with a
- cutoff of less than 10 Hz. Since many transmitters *modulate* the
- transmit VCO, there's no point where you can get carrier without
- modulation in the transmitter. This is the same way your synthesized
- 2 meter HT works. It doesn't have a narrow bandwidth filter to
- "pick out" the carrier either, just a low pass response in the error
- feedback network so it smooths out *long term* frequency error, but
- not the audio modulation.
-
- Gary
- --
- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | |
-
- ------------------------------
-
- Date: 10 Apr 1994 13:44:03 -0400
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!news.ans.net!hp81.prod.aol.net!search01.news.aol.com!not-for-mail@network.ucsd.edu
- Subject: Logging program for Macintosh
- To: info-hams@ucsd.edu
-
- In article <1994Apr7.112736.25572@cobra.uni.edu>, spurra8478@cobra.uni.edu
- writes:
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 14:32:23 GMT
- From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!emory!rsiatl!ke4zv!gary@network.ucsd.edu
- Subject: Low cost antenna required
- To: info-hams@ucsd.edu
-
- In article <budhia.12.2DA65157@underdog.ee.wits.ac.za> budhia@underdog.ee.wits.ac.za writes:
- >
- >I require some info on designing a low cost antenna to rural communities
- >where signal levels are fairly low. Thus a low cost outdoor antenna is
- >required.
-
- What frequency?
-
- Gary
-
- --
- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | |
-
- ------------------------------
-
- Date: 10 Apr 1994 14:38:24 GMT
- From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!xlink.net!news.urz.uni-heidelberg.de!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news@network.ucsd.edu
- Subject: Q: ICOM ICM 700
- To: info-hams@ucsd.edu
-
- Hi there !
-
- anbody out there had experience modifying an ICOM ICM 700
- for use as an amateur RX/TX ?
-
- thanks, wolfgang
-
- ------------------------------
-
- Date: 10 Apr 94 16:17:33 GMT
- From: news-mail-gateway@ucsd.edu
- Subject: SAREX Update & Keps 4/10/94
- To: info-hams@ucsd.edu
-
- SB SAREX @ AMSAT $STS-59.009
- SAREX Update & Keps 4/10/94
-
- Greenbelt, MD, April 10, 1994 at 16:00 UTC
-
- After the successful check pass yesterday, the SAREX Working Group has had
- several reports of packet radio operation and some general voice QSO
- operation during the Shuttle passes over the U.S. In addition, the
- St. Bernard High School in Playa Del Rey, CA had a very excellent school
- group pass this morning (Rev 19). A total of seven questions were asked
- by the students.
-
- The official SAREX element set for today will be GSFC-007. This
- element sent was generated by Ron Parise, WA4SIR of the Goddard Space
- Flight Center. Gil Carman, WA5NOM reports that the predictions using
- GSFC-007 differed from JSC-009 by approximately 20 seconds. GSFC-007
- follows:
-
-
- STS-59
- 1 23042U 94020A 94100.26164012 0.00018681 11051-4 10679-4 0 75
- 2 23042 56.9969 260.0497 0009381 274.0340 85.9677 16.20558915 145
-
- Satellite: STS-59
- Catalog number: 23042
- Epoch time: 94100.26164012 (10 APR 94 06:16:45.71 UTC)
- Element set: GSFC-007
- Inclination: 56.9969 deg
- RA of node: 260.0497 deg Space Shuttle Flight STS-59
- Eccentricity: 0.0009381 Keplerian Elements
- Arg of perigee: 274.0340 deg
- Mean anomaly: 85.9677 deg
- Mean motion: 16.20558915 rev/day Semi-major Axis: 6596.1671 Km
- Decay rate: 0.19E-03 rev/day*2 Apogee Alt: 223.97 Km
- Epoch rev: 14 Perigee Alt: 211.59 Km
-
-
- NOTE - This element set is based on NORAD element set # 007.
- The spacecraft has been propagated to the next ascending
- node, and the orbit number has been adjusted to bring it
- into agreement with the NASA numbering convention.
-
- Submitted by Frank H. Bauer, KA3HDO for the SAREX Working Group
-
- /EX
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 20:43:54 +0000
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!pipex!demon!llondel.demon.co.uk!dave@network.ucsd.edu
- Subject: Undeliverable Message
- To: info-hams@ucsd.edu
-
- In article <A0I8+x3tdha@otts24.Pwc-Tpc.ca> MAILER-DAEMON@Pwc-Tpc.CA writes:
- >To: Info-Hams@UCSD.EDU
- >Cc:
- >Subject: Info-Hams Digest V94 #396
- >
- >Message not delivered to recipients below. Press F1 for help with VNM
- >error codes.
- >
- > VNM3043: Todd Shea@CM.IT@PWC.HDQ
- >
- >------------------ Error number Explanation Follows -------------------
- >
- >VNM3043 -- MAILBOX IS FULL.
- >
- > The message cannot be delivered because the
- > recipient's mailbox contains the maximum number of
- > messages, as set by the system administrator. The
- > recipient must delete some messages before any
- > other messages can be delivered.
- >
- > The default limit is 1000 messages. Administrators
- > can set lower limits if required using the Change
- > mailbox settings function available in the Manage
- > User menu (MUSER). The 1000 message limit is the
- > maximum allowed by the Mail program. If this limit
- > is reached, the recipient must delete some of
- > the messages before the mailbox can accept any more
- > incoming messages.
-
- Oh well, at least it makes a change from the usual 'unknown host' problems.
- Catch is, you can 't send him an email to tell him his mailbox is full :-)
-
- Dave
- --
-
- *****************************************************************************
- * G4WRW @ GB7WRW.#41.GBR.EU AX25 * Start at the beginning. Go on *
- * dave@llondel.demon.co.uk Internet * until the end. Then stop. *
- * g4wrw@g4wrw.ampr.org Amprnet * (the king to the white rabbit) *
- *****************************************************************************
-
- ------------------------------
-
- Date: 10 Apr 94 21:03:54 GMT
- From: news-mail-gateway@ucsd.edu
- Subject: WWV Antennas
- To: info-hams@ucsd.edu
-
- Text item: Text_1
-
- > But WWV is using just vertical dipoles (not phased, as with WWVH). There
- > are certainly higher gain antennas than a dipole that will still retain
- > an omnidirectional `orientation'. Jeff NH6IL
-
- Hello again, Jeff. My point is that one cannot change the gain of an
- antenna system without changing the radiation pattern. In that
- process, while Hawaii may enjoy an increase in signal level,
- Arizona may suffer a decrease in signal level. Who's going to
- be forced to suffer because of the antenna system change?
-
- 73, KG7BK, Cecil_A_Moore@ccm.hf.intel.com (I do not speak for Intel)
-
- ------------------------------
-
- Date: 10 Apr 1994 21:25:49 GMT
- From: ihnp4.ucsd.edu!agate!kabuki.EECS.Berkeley.EDU!kennish@network.ucsd.edu
- Subject: WWV Antennas
- To: info-hams@ucsd.edu
-
- I think that people are applying 2-D thinking to a 3-D
- world. There are two main ways of getting "gain", both
- of which involve concentrating power in one direction
- at the expense of another. WWVH uses what is known
- as a broadside or endfire (can't remember which it was
- from the description) array of vertical dipoles to create
- a pattern, which when viewed from above, appears to
- concentrate its power to the west.
-
- However, there is another way to concentrate power, which
- is what most FM broadcast stations do. If you look at
- a single dipole vertically oriented, you will see that it
- has a omni pattern viewed from above. Fine. If you
- now view it from the ground, a lot of power goes up into the air,
- some of it at nearly 90 degrees to the ground. (An ideal
- dipole has a null at 90 deg.) Now, recall what you learned
- about HF propogation. Power that is sent nearly straight
- up has a much lower chance of skipping (being refracted) than
- one with a low angle of incidence. Thus, that power is most likely
- being wasted. A stacked dipole of proper phasing (two dipoles
- on top of another) can use constructive interference to put more
- power closer to the horizon rather than up in the air.
- This puts more power into the low angles of incidence which are
- much more likely to be refracted and/or reflected back down
- to earth. Note, however, that the omni pattern as viewed
- from above is NOT disturbed. This is how one gets "omni"
- gain. FM broadcasters do this to put as much power as
- possible into the horizon. Not much advertising potential high
- up in the air.....
-
-
- Ken
-
- ------------------------------
-
- Date: (null)
- From: (null)
- *** Logging ***
- <Ham Radio Station Logbook>
- HyperCard stack that stores and displays radio contact information.
- Automatically stamps entries with time and date. Contacts can be sorted by
- frequency, call sign, or date of contact. Includes report formats, a "Q-code"
- reference list, and on-line help. SanSoft, 892 E. Quail Place, Highlands
- Ranch, CO 80126. (The same program appears to be available from Heizer
- Software, 1941 Oak Park Blvd., Suite 30, Pleasant Hill, CA 94523.)
-
- <FDLog!>
- Contact logging and duping program. Can transmit any of ten programmable CW
- messages. Generates real-time statistics on QSO rates. System One Control,
- 3900 85th Ave N, Suite 200, Brooklyn Park, MN 55443.
-
- <MacContest 3.5>
- Allows real-time or post-contest logging of a wide variety of contests. Checks
- for dupes, figures scores instantly, and offers various printouts. Interfaces
- to TNCs for CW and RTTY contests, to DX packet clusters, to Kenwood
- transceivers, and to MacinTalk for easy post-contest entry. Gerald Eberle,
- HB9CEY, P.O. Box 13, CH-4417 Ziefen, Switzerland.
-
- <LOGic>
- (Macintosh version scheduled.) Lets you define the rules determining dupes
- (such as once per band or once per contest). Displays heading, distance, and
- other information about the country being worked. Automatically enters contact
- time; if interfaced directly to a radio, also enters the frequency, band, and
- mode. Shows status toward earning amateur-radio awards. User-definable
- database fields. Exchanges data with other programs. Personal Database
- Applications, 2634 Meadow Bend Court, Duluth, GA 30136.
-
- <HF Logger 1.2>
- A real fine HyperCard logging program! (hey... thats all I got!) N0QGQ
-
- <Simple Log .2b>
- This little utility is a handy way to create a logging file that you can later
- import into any data base for analysis, etc. It also shows you that just about
- anyone can use Think C and create something on the Mac! Let me know if you'd
- like the source code. WD1V @ WA1WOK.NH.USA.NA Author is John Seney - WD1V,
- e-mail address is jseney@aol.com. For a copy of this program, mail a SASE disk
- mailer and 800K disk to: John D. Seney, WD1V, 144 Pepperidge Dr., Manchester,
- NH 03103
- System 7
-
- <Marathon>
- Contesting/logging- Have seen references to (March 92 CQ magazine) and heard
- good things about MARATHON by N 0 IOS. I believe a demo was available for $8.
- Last address known is: Kevin Krueger, N0IOS, 1780 Ruth St., St.Paul, MN 551O9
-
- 73 for now.... c u on the shortwaves
- Terry Stader - KA8SCP
- America Online Ham Radio Club Host
- Macintosh Amateur Radio Software List Maintainer
- Internet: tstader@aol.com (files <28K) or
- p00489@psilink.com ( files >28K)
- KA8SCP@WA1PHY.#EMA.MA.USA.NOAM
- ka8scp@ka8scp.ampr.org [44.56.4.82] Mac
- ka8scp-1@ka8scp-1.ampr.org [44.56.4.120] DOS Clone
- (they're BOTH pc's!)
-
- ------------------------------
-
- Date: Sun, 10 Apr 1994 14:37:11 GMT
- From: netcomsv!netcom.com!kludge@decwrl.dec.com
- To: info-hams@ucsd.edu
-
- References <Cnwor0.6L5@ryn.mro.dec.com>, <CnyGzK.7o8@srgenprp.sr.hp.com>, <262@ravel.okay.com>
- Subject : Re: how's FM broadcast for freq. standard?
-
- In article <262@ravel.okay.com> duncan@ravel.okay.com (Jim Duncan) writes:
- >In article <CnyGzK.7o8@srgenprp.sr.hp.com> alanb@sr.hp.com (Alan Bloom) writes:
- >>Why not call up the broadcast station and ask them? Ask to speak to the
- >>chief engineer.
- >>
- >Most FM stations, including mine, that use recent FM exciters typically
- >end up being +/-100 Hz. of the exact assigned carrier frequency. So
- >this would work out to roughly 1 ppm. accuracy. You can't take this
- >totally for granted, of course, since the FCC requires only +/- 2 kHz..
-
- Around here, I am unhappy to report that there are a lot of stations that
- just barely meet the +/- 2 kHz requirement and at least one that doesn't.
- (Admittedly one of them is using a 1952 vintage RCA exciter that was designed
- originally for the 40 MHz band, which RCA resold as an 88 MHz exciter by
- replacing the final 6146 stage with a frequency doubler, and as a result
- the drift is multiplied).
-
- Most of the stations out here in rural VA don't have engineers on-staff
- any longer, and they only fix things when they become catastrophically
- broken. This does not tend to result in the best quality signal making
- it out over the air.
- --scott
- --
- "C'est un Nagra. C'est suisse, et tres, tres precis."
-
- ------------------------------
-
- End of Info-Hams Digest V94 #400
- ******************************
-