RE: [AMRadio] watt meter
The Best measurement I ever got was using a dummy load of know resistive accuracy. I used a new Cantenna from heath kit. I said new because if over heated once they can change resistance. The older one seemed to be better. Anyway, I removed the little box cover on the top and stripped out the circuitry in it. Then I mounted a 7 pin socket in the top cover of the box. Plugged in a 6AL5 and connected a plate to the top connection of the 50 ohm resistor dummy load brought the filament wires out to a 6.3v XFMR and connected to corresponding cathode to the RCA phono plug that was on the side of the little box. I then bypassed the cathode connection with a .01uf ceramic capacitor rated at 1000v and no bleader. The theory is that the 6AL5 diode has very little plate to cathode capacitance (used a lot in the older RF probes by HP). It provides a very accurate rectification of the RF and will charge the capacitor to a very accurate peak of the RF voltage. The DC voltage can be measured by any good accurate DC voltmeter and will be a representation of the peak RF. Calculation as follows: Convert the measured DC to RMS of RF by multiplying time 0.707 Power formula (Erms * Erms) / 50ohms = Power Somebody check me on this, because it has been awhile, but I think this all reduces to Epeak squared divided by 100 (DC * DC) / 100 = Power I have checked this all the way up to 10 meters against several of the bird watt meters owned by FCC commercial licensed companies doing TYPE acceptance checks. It is as accurate as the dummy load and voltmeter that you have. GL,73 John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett gazdzinski Sent: Wednesday, March 01, 2006 3:10 PM To: 'Discussion of AM Radio' Subject: RE: [AMRadio] watt meter What is everyone doing for a watt meter? My swan wm-3000 blew up last weekend, it reads no pep and about 1/4 of the correct average power. I could fix it if I could find out what diodes they used (3 gone), and one of the little inducters broke, but it would not be calibrated. It was a good meter, 4 scales going up to 2kw, real pep reading, large meter, but its toast. Looking around, not much out there that does high continuous power, real pep readings, looks good, etc. I went to ham radio outlet in Delaware today (working close by) and despite waiting for almost an hour, could not get much help. They would not let me open a box of a daiwa meter, and I hate the cross needle meters anyway, they had a diamond, not true pep, but I could not look at that, they wont unseal a box unless you buy it. That and the poor service had me walk out of the store vowing never to buy anything from them, ever. Some web searching turns up CB type meters, not good at lower frequencies, or discontinued units. Nye viking used to make a good one, but not anymore. The 813 rig can do well over the 1500 watt pep level, well over 2000 watts pep with the neg cycle loading deck hooked up, so I need something good for the power. MFJ makes one, but the manual shows its only good for 500 watts 100% duty cycle, 600 or 700 watts of carrier means 90 second transmissions (how cheap that mfj stuff is). Not much on ebay but old heathket meters... Brett N2DTS __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] watt meter
My watt meters use 1N82 and 1N60's for diodes so a good germanium diode should work. I just replaced the 1N82 in my Collins 302C after powering up with antenna disconnected- won't do that again. Healthfully yours, DON W4BWS - Original Message - From: Brett gazdzinski [EMAIL PROTECTED] To: 'Discussion of AM Radio' amradio@mailman.qth.net Sent: Wednesday, March 01, 2006 6:36 PM Subject: RE: [AMRadio] watt meter If I could find out the diode type, I could replace them, the inductor looks to be a match with another one (forward/reflected?). It's a small potted thing, almost looks like a cross between a resistor and a small electrolytic cap. I don't know how you would calibrate it for average and pep, the average I could do off another working meter. I use the watt meter partly as a performance monitor, its right in front of the operating position, so if the swr goes wacko, or the audio screws up, the meter will show it. I have a regular scan of the plate current, grid current, watt meter, mod monitor when I first get on, then every once and a while do a re-scan. There is a hole in my scan now! Brett N2DTS I have a Bird 4411 which uses one slug for 2-30 Mcy. The meter has a switch that will change the power scale from 10 watts to 10K watts. It is not a true peak meter but there is a formula that derives it in the book. The 4411 is a 4410 with provisions for AC input, the 4410 is 9V battery powered only, I think. The drawback to these meters is you usually find the meter without the slug, and the meter is expensive. I have seen them at hamfests, but the slug is hard to find and very expensive. It is accurate to 5% of full scale. As for the diodes most any matched diodes would probably work. Seems as if the Drake MN 2000 had 1N295 or some such. Someone with a manual could check. Get a handful of the NTE replacements and match them, they are inexpensive. 73 Jim W5JO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
[AMRadio] Marconi (Canada)Filter
Does anyone have info on a Canadian Marconi filter type 95528 spec # 95542 ? --- Bill From [EMAIL PROTECTED] Thu Mar 2 12:33:19 2006 Return-Path: [EMAIL PROTECTED] X-Original-To: amradio@mailman.qth.net Delivered-To: amradio@mailman.qth.net Received: from ms-smtp-02.rdc-kc.rr.com (ms-smtp-02.rdc-kc.rr.com [24.94.166.122]) by mailman.qth.net (Postfix) with ESMTP id 89E67859C5F for amradio@mailman.qth.net; Thu, 2 Mar 2006 12:33:19 -0500 (EST) Received: from computer-cj2ofd.neb.rr.com (CPE-65-28-164-67.neb.res.rr.com [65.28.164.67]) by ms-smtp-02.rdc-kc.rr.com (8.13.4/8.13.4) with ESMTP id k22HX05d026161 for amradio@mailman.qth.net; Thu, 2 Mar 2006 11:33:01 -0600 (CST) Message-Id: [EMAIL PROTECTED] X-Mailer: QUALCOMM Windows Eudora Version 7.0.1.0 Date: Thu, 02 Mar 2006 11:33:04 -0600 To: Discussion of AM Radio amradio@mailman.qth.net From: Dan Wright [EMAIL PROTECTED] In-Reply-To: [EMAIL PROTECTED] References: [EMAIL PROTECTED] Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1; format=flowed; x-avg-checked=avg-ok-5DEC5590 X-Virus-Scanned: Symantec AntiVirus Scan Engine Subject: [AMRadio] Yaesu FT-101E X-BeenThere: amradio@mailman.qth.net X-Mailman-Version: 2.1.4 Precedence: list Reply-To: Discussion of AM Radio amradio@mailman.qth.net List-Id: Discussion of AM Radio amradio.mailman.qth.net List-Unsubscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] List-Archive: http://mailman.qth.net/mailman/private/amradio List-Post: mailto:amradio@mailman.qth.net List-Help: mailto:[EMAIL PROTECTED] List-Subscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] X-List-Received-Date: Thu, 02 Mar 2006 17:33:19 - Greetings! I have made the AM mods to my FT-101EX. I bought the AM filter from INRAD. I bought the 160 meter and 10 meter crystals from JAN. I spent more on that stuff than I did on the radio.. :-| I performed the AM window mods (sounds pretty good) for both receive and transmit. I hope to use the rig primarily on ten meter ayem Sooo.the rig divides up the ten meter band into four segments, but NOWHERE in my manual does it say WHAT these segments are!!! Are they 500Khz? What? Does anyone know? I suppose I could wait till I get the crystals and see for myself, but you would think that the manual would have the infomaybe mine is missing pages(?). Thanks es 73 de Dan -- WAØJRD .. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: 3/1/2006
Re: [AMRadio] Yaesu FT-101E
Dan Wright wrote: Greetings! I have made the AM mods to my FT-101EX. I bought the AM filter from INRAD. I bought the 160 meter and 10 meter crystals from JAN. I spent more on that stuff than I did on the radio.. :-| I performed the AM window mods (sounds pretty good) for both receive and transmit. I hope to use the rig primarily on ten meter ayem Sooo.the rig divides up the ten meter band into four segments, but NOWHERE in my manual does it say WHAT these segments are!!! Are they 500Khz? What? Does anyone know? I suppose I could wait till I get the crystals and see for myself, but you would think that the manual would have the infomaybe mine is missing pages(?). typically, yes... 10A 28.0 ~ 28.5 10B 28.5 ~ 29.0 10C 29.0 ~ 29.5 10D 29.5 ~ 30.0 (top end, of course, is 29.7) Near as I can tell, the xtals needed for the FT-101 series rigs, starts at 34.020 Mc, and increase by 500kc from there. ie: Band 10A = 34.020 = 28.0 ~ 28.5 Band 10B = 34.520 = 28.5 ~ 29.0 Band 10C = 35.020 = 29.0 ~ 29.5 Band 10D = 35.050 = 29.5 ~ 30.0 Mc Hope that helps. -- 73 = Best Regards, -Geoff/W5OMR
[AMRadio] HP-1741A
Operating your AM Rig without a Scope, is like driving your car at night, without headlights (~ Don Chester/K4KYV Then editor AM Press Exchange) Speaking of scopes, I've got a Hewlitt-Packard 1741A 100MHz dual trace Persistance scope here, for sale, if someone wants one. $200(obo) + shipping from 78223. You tell me which carrier you want. (the manual alone, is selling for $50 on the 'net) Comes with: Two probes Original manual Extra 'blue' CRT lens field viewing hood (for blocking daylight) DESCRIPTION The ease-of-use and reliability that the 1741A Variable Persistence Storage Oscilloscope delivers has continued to make it a highly desired instrument covering a wide range of applications. Sensitivity of 5 mV to 20 V/div., 100 ms to over 1 minute of variable persistence and up to 1 hour of storage for outstanding signal viewing. Sweep rates of 50 ns to 2 S/div are available. Its ability to retain a trace on the screen (persistence) is available from 100 ms to over 1 minute and up to 1 hour of storage is also provided! This type of storage is essential for those one-shot opportunities (non-recurring signals). Other features include: minimum blind time and auto-intensity circuitry, third channel trigger view, and selectable input impedance. Bandwidth: 100MHz This scope has been seen without any 'extras' on-line, for as high as $600 (current prices) Contact me off-list. -- 73 = Best Regards, -Geoff/W5OMR
[AMRadio] Free for taking: RCA BTA-1L Scranton PA
Following is posted with permission Free for the taking: RCA AM broadcast tx located at Entercom property in Scranton PA. Must be moved ASAP or it goes into landfill. RCA BTA-1L For information Contact Lamar Smith, DOE of Entercom there at [EMAIL PROTECTED] Please do not contact me--I am not connected with Entercom and am only attempting to facilitate the avoidance of another vintage AM broadcast tx going into a dump. rob atkinson k5uj _ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
Re: [AMRadio] Yaesu FT-101E
Dan the segments are: 28.0 - 28.5 MHz 28.5 - 29.0 MHz 29.0 - 29.5 MHz 29.5 - 30.0 MHz They are set by 4 little crystals. Sometimes CB ops will have hacked these out and put something else in there for the 11m band or worse yet the illegal free band between 11m and 10m. On 2 Mar 2006 at 11:33, Dan Wright wrote: Greetings! I have made the AM mods to my FT-101EX. I bought the AM filter from INRAD. I bought the 160 meter and 10 meter crystals from JAN. I spent more on that stuff than I did on the radio.. :-| I performed the AM window mods (sounds pretty good) for both receive and transmit. I hope to use the rig primarily on ten meter ayem Sooo.the rig divides up the ten meter band into four segments, but NOWHERE in my manual does it say WHAT these segments are!!! Are they 500Khz? What? Does anyone know? I suppose I could wait till I get the crystals and see for myself, but you would think that the manual would have the infomaybe mine is missing pages(?). Thanks es 73 de Dan -- WAØJRD .. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: 3/1/2006 __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
RE: [AMRadio] watt meter
The Best measurement I ever got was using a dummy load of know resistive accuracy. I used a new Cantenna from heath kit. I said new because if over heated once they can change resistance. The older one seemed to be better. I use a dummy load made of a dozen 600-ohm Glo-Bar resistors in parallel. The composition material looks like it is tinned at each end, and plugs into clips just like a cartridge fuse. Not exactly sure the power rating of each, but they are hollow composition tubes about 1 in diameter and 18 long. They were new in the box, dated 1945, apparently WW2 surplus intended for use as rhombic antenna terminating resistors. I can load the transmitter up to 1 kw output and run that into the load for 30 minutes or more, and although the resistors get very warm, nothing looks like it is anywhere near the self-destruct point. I have the resistors mounted vertically to produce a chimney effect for convection cooling without a fan. When cold, the parallelled resistors measure exactly 50 ohms with my Fluke DVM. But if I run the load hot for a while, the DC resistance changes a few ohms (don't remember if it increases or decreases), but the SWR meter still reads exactly 1:1. If I want to measure the power output of a transmitter, I load it into that dummy load, measure the rf current with a thermocouple meter, and calculate using ohms law. On the air, none of my feedlines look anything near like 50-ohms nonreactive. On 160m, I use an outboard L-network to make the transmitter see a 50-ohm load, since the el-cheapo Gates is designed to work into a very narrow range of 50-70 ohms (much like a ricebox), whereas other BC transmitters of the same era were rated to work into 30-600 ohms or so. If you use an outboard L-network, beware of transmitting into it with the feedline disconnected. I did that twice. Once when the flexible stranded copper lead on my T/R relay failed, and once when I forgot to re-engage the antenna switch following a thunderstorm. Each time, I blew up the rf ammeter mounted in the transmitter, wired in series with the rf output line. Apparently, just working into the L-network without a proper load on it generates ENORMOUS circulating rf current and blows the thermocouple in the meter. I just strapped across the output rf ammeter in the transmitter. That meter needs to go between the last element of the matching network and the feedline itself. It would be nice to be able to read rf power output directly using the rf ammeter, but thermcouple meters are too rare and expensive to blow up every time the transmitter is accidentally keyed up without a load. The broadcast station where I once worked had a matching network between transmitter and tower, and I never remember blowing the rf ammeter. They had a disconnect switch to remove the meter from service when readings were not being taken, to avoid lightning jolts wiping out the thermocouple. Of course, since it was a broadcast station designed to run 24/7, there was no disconnect switch to remove the tower from the output network, nor any T/R switch in the line, so the L-network never worked without a proper load. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. Try it - you'll like it. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/
Re: [AMRadio] Yaesu FT-101E
Bry sez: Dan the segments are: 28.0 - 28.5 MHz 28.5 - 29.0 MHz 29.0 - 29.5 MHz 29.5 - 30.0 MHz Thanks! I kinda thought so, but saw no documentation They are set by 4 little crystals. Sometimes CB ops will have hacked these out and put something else in there for the 11m band or worse yet the illegal free band between 11m and 10m. Yeahmy manual DOES mention the crystal for 11 meters!! Thanks a bunch es 73 de Dan -- WAØJRD .. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: 3/1/2006
[AMRadio] FM transmitter
Hope they don't measure the FM broadcast transmitter I have, so I can listen while doing stuff around the house and yard with a walkman, its over a watt I think... What kind of FM transmitter do you use? I have been looking for something so I can use to feed streaming audio from my desktop computer to all the FM radios on my property, so I don't have to sit in front of the computer to listen. I ordered one of the little FM stereo xmtrs from C Crane. It had good synthesised frequency stability, but the audio was distorted and it had a range of about 35 feet. I need good solid coverage within a radius of at least 100 feet. I had intended to experiment with an external antenna with the thing, but it crapped out before I could do that. They refunded my money. I think Ramsey sells kits, but I have heard they are pieces of crap. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. Try it - you'll like it. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/
[AMRadio] FS: Small Audio Transformers
FOR SALE: Audio Driver Transformers - 15K to 60K CT. Suitable for a small modulator up to 15 or 25 watt class or may be used as an interstage or input transformer. Frequency response is 200 Hz - 6000 Hz. These are new and they are round, potted type. Dimensions approx. 2 tall by 7/8 diameter. QTY 8 available for $12.00 each. ALSO: Audio Driver Transformer - 50K to 50K CT. Suitable for a small modulator up to 15 or 25 watt class or may be used as an interstage or input transformer. Frequency response 200 Hz - 6000 Hz. These are new and they are round, potted type. Dimensions approx. 2 tall by 7/8 diameter. QTY 8 available for $12.00 each. I also have some small 600 ohm to 600 ohm transformers available if anyone would like some. http://www.af4k.com/xfmrs.htm
[AMRadio] FS: Large VU Meters
FOR SALE: Large VU Meters. I have two of these large, really neat 4 VU meters for sale. One is an ALTEC and the other has no name brand, buit looks to be the same size. Four inches square with rounded corners. These are the kind of meters that were used in old audio consoles for radio broadcasting, recording studios etc. Available for $24.00 each plus shipping. Pictures and details at: http://www.af4k.com/meters.htm
Re: [AMRadio] Yaesu FT-101E
Hey Dan: I am surprised the manual does not list frequency ranges. Not familiar with the FT-101 but if it has two ranges on 10 meters now, subtract the difference between the crystal frequencies and you will likely have the coverage in KHz ? 73 DE Charlie, K0NG ..
RE: [AMRadio] FM transmitter
http://cgi.ebay.com/4-Watt-FM-Stereo-Broadcast-Radio-Transmitter-PLL-AGC_W0Q QitemZ5873268749QQcategoryZ4675QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Edit that to fit the browser. That is the one I have, its just like a broadcast station, with a good antenna, the range is very good. For some reason, mine came with a very large heat sink, maybe the new models are more efficient. I have it set up so the transmitter comes on when I power up the shack. I love old buzzard round tables as I can go make tea, smoke, use the can, sweep out the garage, etc, all while listening till its my turn. I made a 1/4 wave dipole out of a PL259 and coat hangers, and stuck it on my vent pipe on the roof. I never checked the range, its on 90.4 MHz. A good antenna would likely get me in trouble. 4 watts and a good antenna would likely go many miles. The ramsy ones are good for a few hundred feet tops and sound poor. Brett N2DTS -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Donald Chester Sent: Thursday, March 02, 2006 5:40 PM To: amradio@mailman.qth.net Subject: [AMRadio] FM transmitter Hope they don't measure the FM broadcast transmitter I have, so I can listen while doing stuff around the house and yard with a walkman, its over a watt I think... What kind of FM transmitter do you use? I have been looking for something so I can use to feed streaming audio from my desktop computer to all the FM radios on my property, so I don't have to sit in front of the computer to listen. I ordered one of the little FM stereo xmtrs from C Crane. It had good synthesised frequency stability, but the audio was distorted and it had a range of about 35 feet. I need good solid coverage within a radius of at least 100 feet. I had intended to experiment with an external antenna with the thing, but it crapped out before I could do that. They refunded my money. I think Ramsey sells kits, but I have heard they are pieces of crap. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. Try it - you'll like it. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] FM transmitter
- Original Message - I made a 1/4 wave dipole out of a PL259 and coat hangers, and stuck it on my vent pipe on the roof. I never checked the range, its on 90.4 MHz. A good antenna would likely get me in trouble. 4 watts and a good antenna would likely go many miles. That's an excellent way to lose your ham license while courting a $10,000 fine from the FCC for unlicensed operation. Current Part 15 rules permit a MAXIMUM field strength of 250 microvolts per meter at 3 meters from the transmitting antenna. If you check the FCC Enforcement Log, available on the Enforcement Bureau page of the Commission's Web site, you will see numerous people who got busted for transmitting in the FM broadcast band without a proper radio station license. A few of these show up every week. If the bootlegger is a college kid or a preacher who puts an unlicensed station on the air as a hobby or to broadcast his church services, he may get away with a warning not to do it again. Since you are a ham, and, therefore, licensed by the FCC, you would lose your license and be hit with a heavy fine. Your radio equipment could also be confiscated. In Florida, you would also face state charges, as the Sunshine State passed a law a couple of years ago that makes unlicensed operation in the broadcast bands a felony. BTW, the FCC just levied a massive fine against Ramsey Electronics for marketing export only FM broadcast transmitters that did not have FCC type acceptance for regular broadcast use. The bottom line is, such equipment is illegal. And the FCC is vigorously enforcing the rules that apply to the AM and FM broadcast bands. If you want to hear your AM roundtable while you are called away to the telephone or using the bathroom, get a good speaker, attach it to your receiver, and turn up the volume. Phil K2PG
Re: [AMRadio] FM transmitter
Moral of the story is this: Keep your eyes peeled for the Cat Detector Van. http://mzonline.com/bin/view/Python/FishLicenseSketch (This actually refers to the British licensing of radio and TV receivers. Both require a license and they actually go around in vans to ctach and punish persons listening without a license!) On 2 Mar 2006 at 19:54, Phil Galasso wrote: - Original Message - I made a 1/4 wave dipole out of a PL259 and coat hangers, and stuck it on my vent pipe on the roof. I never checked the range, its on 90.4 MHz. A good antenna would likely get me in trouble. 4 watts and a good antenna would likely go many miles. That's an excellent way to lose your ham license while courting a $10,000 fine from the FCC for unlicensed operation. Current Part 15 rules permit a MAXIMUM field strength of 250 microvolts per meter at 3 meters from the transmitting antenna. If you check the FCC Enforcement Log, available on the Enforcement Bureau page of the Commission's Web site, you will see numerous people who got busted for transmitting in the FM broadcast band without a proper radio station license. A few of these show up every week. If the bootlegger is a college kid or a preacher who puts an unlicensed station on the air as a hobby or to broadcast his church services, he may get away with a warning not to do it again. Since you are a ham, and, therefore, licensed by the FCC, you would lose your license and be hit with a heavy fine. Your radio equipment could also be confiscated. In Florida, you would also face state charges, as the Sunshine State passed a law a couple of years ago that makes unlicensed operation in the broadcast bands a felony. BTW, the FCC just levied a massive fine against Ramsey Electronics for marketing export only FM broadcast transmitters that did not have FCC type acceptance for regular broadcast use. The bottom line is, such equipment is illegal. And the FCC is vigorously enforcing the rules that apply to the AM and FM broadcast bands. If you want to hear your AM roundtable while you are called away to the telephone or using the bathroom, get a good speaker, attach it to your receiver, and turn up the volume. Phil K2PG __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
RE: [AMRadio] FM transmitter
Yet another choice is the 900 mhz cordless head phones. I remoted the transmitter in my attic and fed the audio up to it via shielded wire. I increased my range enough to cover most of my yard while mowing and it isn't a small yard. The other choice was to remote the transmitter t the top of the tower and see what it does. Since the transmitter has not had it's antenna changed and it is just higher off the ground I doubt there s an issue with the FCC. 73 Larry WA9VRH On Thu, 2 Mar 2006 20:02:29 -0500, Gary Schafer [EMAIL PROTECTED] wrote : If you want to hear your AM roundtable while you are called away to the telephone or using the bathroom, get a good speaker, attach it to your receiver, and turn up the volume. An old cordless phone would do the trick. 73 Gary K4FMX __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
RE: [AMRadio] FM transmitter
Well, I don't broadcast anything, I doubt the range is very good, I don't think anyone would complain about it being on an open frequency, and its only on when I operate, so I wont loose any sleep over it. I should check the range though, the lower power ones did not make it past my yard, and did not work very well in the yard The one I have may be 1 watt, they sold many different ones in the past, and I don't remember what one I got. I think its got a power adjustment, its all software controlled... If the range is greater then the yard, I can turn it down I guess. I tried the wireless headphones, they did not work worth a crap, they are good for a room, not much else. Brett -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Phil Galasso Sent: Thursday, March 02, 2006 7:55 PM To: Discussion of AM Radio Subject: Re: [AMRadio] FM transmitter - Original Message - I made a 1/4 wave dipole out of a PL259 and coat hangers, and stuck it on my vent pipe on the roof. I never checked the range, its on 90.4 MHz. A good antenna would likely get me in trouble. 4 watts and a good antenna would likely go many miles. That's an excellent way to lose your ham license while courting a $10,000 fine from the FCC for unlicensed operation. Current Part 15 rules permit a MAXIMUM field strength of 250 microvolts per meter at 3 meters from the transmitting antenna. If you check the FCC Enforcement Log, available on the Enforcement Bureau page of the Commission's Web site, you will see numerous people who got busted for transmitting in the FM broadcast band without a proper radio station license. A few of these show up every week. If the bootlegger is a college kid or a preacher who puts an unlicensed station on the air as a hobby or to broadcast his church services, he may get away with a warning not to do it again. Since you are a ham, and, therefore, licensed by the FCC, you would lose your license and be hit with a heavy fine. Your radio equipment could also be confiscated. In Florida, you would also face state charges, as the Sunshine State passed a law a couple of years ago that makes unlicensed operation in the broadcast bands a felony. BTW, the FCC just levied a massive fine against Ramsey Electronics for marketing export only FM broadcast transmitters that did not have FCC type acceptance for regular broadcast use. The bottom line is, such equipment is illegal. And the FCC is vigorously enforcing the rules that apply to the AM and FM broadcast bands. If you want to hear your AM roundtable while you are called away to the telephone or using the bathroom, get a good speaker, attach it to your receiver, and turn up the volume. Phil K2PG __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
[AMRadio] Fw: Re: tubes
Below are listed the remainig tubes with prices. These were obtained from a local college that declared them sulplus/obsolete. They are all NOS in original factory boxes. SH is additional for less than 10 tubes; figure $3. Buy 10 or more tubes and shipping is free. TYPE NO $ EA. 0A2 181.60 0A3 2 2.00 0B2 141.90 12AX7 13.30 12BY7A 1 4.00 12CR6 2 2.00 1A7GT11.00 1J3 92.50 1R522.20 1U431.80 1X2B20.80 2AS2101.50 2D2111.00 3A3C43.00 3BC551.50 3CE5/3BC5 51.50 3DG452.00 3V442.80 4CB611.50 5654/6AK5W 11.30 5U4GB25.20 5V4GA24.20 6AB451.70 6AH4GT144.80 6AH611.10 6AK5/EF95 111.40 6AK5W/5654 31.30 6AK611.30 6AKB42 offer 6AL5361.10 6AM841.80 6AM8A381.80 6AN8A102.30 6AQ5201.90 6AQ5A21.90 6AQ5A/6HG5 41.90 6AQ6230.90 6AS43offer 6AS540.60 6AS630.60 6AS7GA12.60 6AS820.60 6AU6A191.80 6AU871.60 6AU8A61.60 6AV6591.30 6AW8A121.50 6AX4GTB70.60 6AX5GT161.50 6BA671.70 6BC550.60 6BC722.50 6BE681.70 6BF5151.20 6BH8201.60 6BJ671.20 6BJ730.80 6BK4C/6EL4A 114.20 6BK550.60 6BK7B31.50 6BL7GTA93.00 6BL8/ECF80 111.80 6BN412.00 6BN4A52.00 6BN651.30 6BN6/6KS6131.30 6BQ6GTB/6CU6 150.50 6BQ7A10.50 6BQ7A/6BZ7 1 0.50 6BQ7A/6BZ7/6BS85 0.50 6BU8190.60 6BW431.20 6BX7GT24.20 6BY6201.30 6BY850.90 6BZ750.50 6C491.80 6C4A31.80 6CB6A21.10 6CD6GA31.90 6CF631.10 6CG311.90 6CG8A100.75 6CL342.00 6CL3/6CK3 12.50 6CM7110.80 6CQ820.90 6CS6201.30 6CS711.30 6CU530.60 6CW5/EL86 31.50 6CY7141.10 6CZ543.00 6D4A13.00 6D4A/6DM4A 30.80 6DA444.00 6DA4A/6DM4A 80.80 6DE411.50 6DE6110.60 6DQ6B12.30 6DR731.70 6DS426.00 6DS571.50 6DT630.90 6EB861.20 6EH7/EF183 30.90 6EJ710.40 6EJ7/EF184 30.40 6EU727.60 6EW6101.70 6EW81offer 6F551.90 6FM7352.50 6FQ7/6CG7 24.20 6FY5153.00 6GE5143.10 6GJ762.00 6GK552.10 6GK5/6F5A 12.10 6GK5/6FQ5A32.10 6GN831.60 6H611.00 6HE5103.00 6HL65offer 6HS855.40 6HZ640.90 6J522.00 6J670.90 6J6A50.90 6J741.80 6JT852.00 6K6GT11.90 6N741.80 6S4A31.40 6SM75 offer 6SR7142.50 6V6GT16.70 6W4GT300.60 EL9542.00 From [EMAIL PROTECTED] Thu Mar 2 22:53:48 2006 Return-Path: [EMAIL PROTECTED] X-Original-To: amradio@mailman.qth.net Delivered-To: amradio@mailman.qth.net Received: from smtp113.sbc.mail.mud.yahoo.com (smtp113.sbc.mail.mud.yahoo.com [68.142.198.212]) by mailman.qth.net (Postfix) with SMTP id 386E4859C20 for amradio@mailman.qth.net; Thu, 2 Mar 2006 22:53:48 -0500 (EST) Received: (qmail 40723 invoked from network); 3 Mar 2006 03:53:26 - Received: from unknown (HELO W1PE) ([EMAIL PROTECTED]@70.251.118.142 with login) by smtp113.sbc.mail.mud.yahoo.com with SMTP; 3 Mar 2006 03:53:26 - From: Bob Peters [EMAIL PROTECTED] To: 'Discussion of AM Radio' amradio@mailman.qth.net Subject: RE: [AMRadio] FM transmitter Date: Thu, 2 Mar 2006 21:53:18 -0600 Message-ID: [EMAIL PROTECTED] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer:
