Re: [AMRadio] Valiant Problems
Bill: Increase the size of the fuse to 1.8 amp. or so. Johnson had problems with that in some transmitters, even the Valiant II. There was a factory notice about it and they first changed it to a slo-blo fuse which fixed most problems. That rating is right on the ragged edge and should have been 1.5 times the actual current draw. You might want to measure it to see what the supply is drawing to be sure it is proper, meaning less than about 1.5 amps or so. Put an ammeter in the variac setup to measure it. The manual specs the modulator at 50-70 mils. Use the meter on the transmitter and set the current in that range with the meter set in the MOD position. The later manual specs the RF amp. grid bias at -69 volts with respect to ground. That setting will do what you want. Also be sure to set the clamp pot after you get it right. Be absolutely sure the meter shunts are tight. They used nichrome wire for the shunts with which will not take solder. They are just crimped tightly then solder is flowed over them to hold them in place. Chances are, over the years heat and current flow has loosened the solder. You can replace them with wire wound resistors of the proper value and wattage rating. The meter has an internal resistance of 20 ohms, as I recall. 73 Jim de W5JO > Could really use some help here from those of you who have had experience with the Johnson Valiant xmtr. Three questions... > > 1) Why does the 1.6 amp slo-blo low voltage transformer primary fuse blow after an hour or so of just sitting there with the filament switch on with no plate voltage applied? The 300 vdc and -250 vdc bias circuits are reading as they should when measured. Transformer and filter choke case temperature are warm to the touch but not "HOT". Line voltage is @ 110vac thru a Variac. > > 2) What is the correct setting for the voltage at the modulator grids (pin 5)? Page 9 of the ops manual says "-55 volts", page 31, socket voltage chart says "-46 volts", and the assembly manual eratta sheet says "-35 volts". > > 3) What is the correct voltage for the RF amp bias? Page 8 of the ops manual & the socket voltage chart says "-70 volts", service bulletin #1 says "-52 volts" and the assembly manual errata sheet says "-85 volts". > > Any help here would be greatly appreciated. Thanks, Bill, [EMAIL PROTECTED]
[AMRadio] Valiant Problems
Could really use some help here from those of you who have had experience with the Johnson Valiant xmtr. Three questions... 1) Why does the 1.6 amp slo-blo low voltage transformer primary fuse blow after an hour or so of just sitting there with the filament switch on with no plate voltage applied? The 300 vdc and -250 vdc bias circuits are reading as they should when measured. Transformer and filter choke case temperature are warm to the touch but not "HOT". Line voltage is @ 110vac thru a Variac. 2) What is the correct setting for the voltage at the modulator grids (pin 5)? Page 9 of the ops manual says "-55 volts", page 31, socket voltage chart says "-46 volts", and the assembly manual eratta sheet says "-35 volts". 3) What is the correct voltage for the RF amp bias? Page 8 of the ops manual & the socket voltage chart says "-70 volts", service bulletin #1 says "-52 volts" and the assembly manual errata sheet says "-85 volts". Any help here would be greatly appreciated. Thanks, Bill, [EMAIL PROTECTED]
[AMRadio] re: FS/T: 4X150G, 5894A Tubes
From: "Merz Donald S" <[EMAIL PROTECTED]> Subject: [AMRadio] FS/T: 4X150G, 5894A Tubes For Sale Or Trade 2 used Eimac 4X150G tubes. Filaments test good. I know nothing about these. If you can use 'em, make an offer. same a s 4X150A except heater is 2.5V Heater Characteristics Heater Voltage 2.5 Volts Heater Current 6.25 Amperes 4 used 5894A tubes. I think these are all Amperex, but one may be another brand. Filaments are good. Otherwise untested. If you can use 'em, make an offer. Like an 'HF' version of 829B http://www.wps.com/archives/tube-datasheets/Datasheets/Amperex-CC-363/4.JPG http://www.wps.com/archives/tube-datasheets/Datasheets/Amperex-CC-363/5.JPG Thanks. 73, Don Merz, N3RHT
Re: [AMRadio] test
Hi Mike: Well not quite. Have a DX 100 up and running right now. Am waiting for some shelves to arrive before I complete the installation. The tower has yet to be put up for permanent antennas on 75 meters/40 meters, but that will come soon. I am waiting for the guy who built the house to come out and help me choose a location for the base. It is a self supporting thing with a 3x3x4 ft. base and I have rock under part of the foundation. I am ready for the King though. There are times others have trouble hearing me. Looking forward to having it on. The reason for the test is that sometime back I posted to the board and it was rejected for some reason. They have installed new filters and the header on my message was rejected. I contacted Brian about it and he was looking into it. I just wanted to see if he found the trouble. I thought so and sure enough it is. Good to hear from you. 73 Jim de W5JO > Hello Jim > > Are you all set up at your new QTH and have that Globe King running yet? > > Mike W0FD > > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Jim Wilhite > Sent: Thursday, June 10, 2004 11:44 AM > To: AM Radio Discussion List > Subject: [AMRadio] test > > > This is a test to see if I can post. > > 73 Jim > de W5JO > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > > ___ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio >
RE: [AMRadio] test
Hello Jim Are you all set up at your new QTH and have that Globe King running yet? Mike W0FD -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jim Wilhite Sent: Thursday, June 10, 2004 11:44 AM To: AM Radio Discussion List Subject: [AMRadio] test This is a test to see if I can post. 73 Jim de W5JO ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
Re: [AMRadio] test
Same here - working with a different mail program. 73 = Best Regards, -Geoff/W5OMR Jim Wilhite wrote: This is a test to see if I can post. 73 Jim de W5JO ___ AMRadio mailing list AMRadio@mailman.qth.net http://mailman.qth.net/mailman/listinfo/amradio
[AMRadio] test
This is a test to see if I can post. 73 Jim de W5JO
[AMRadio] My Comments to FCC re Phone Band Expansion
http://gullfoss2.fcc.gov/prod/ecfs/retrieve.cgi?native_or_pdf=pdf&id_document=6516213125 Before the Federal Communications Commission Washington, D.C. 20554 In the Matter of ) Amendment of Part 97 of the Commissions Rules ) WT Docket No. 04-140 Governing the Amateur Radio Services ) TO: The Commission Comments of Donald B. Chester THIS COMMENTER 1. These are comments of Donald B. Chester, a licensed amateur operator since 1959 and Amateur Extra Class licensee since 1963, with amateur call sign K4KYV. This commenter is presently active on the 160, 80, 40 and 10 metre amateur bands with primary interest in operating voice and CW modes using mostly homebuilt equipment. INTRODUCTION 2. I agree with the concept of the ARRL proposal regarding re-farming the HF bands, that the phone segments of the 80/75m and 40m amateur bands should be expanded. In recent years I have increasingly noticed a dearth of activity, except during certain contest periods, throughout the CW/RTTY/data segment of the 3.5-4.0 mHz band, even under optimum wintertime conditions on weekends during hours of darkness, when this band is most heavily occupied. During these same time periods the voice segment is often congested to the point that it is of limited use for reliable communication. The proposed changes for the 80/75m band would grant General class licensees only 50 kilohertz of additional voice spectrum, while Advanced and Extra class licensees would be granted a mere 25 additional kilohertz. For this reason I feel that the proposed changes do not go nearly far enough. The discussion that follows will be limited to the 3.5-4.0 mHz band, where the allocation of emission modes is most clearly disproportionate. AVAILABLE COMMUNICATION CHANNELS UNDER PRESENT RULES 3. The present rules allow for voice and other wideband emissions in the segment between 3.75 and 4.0 mHz, while CW is allowed throughout the entire 3.5-4.0 mHz allocation. RTTY and data modes are allowed only in the segment reserved for narrowband modes. In actual practice, CW is rarely used in the 3.75-4.0 mHz voice segment; therefore, CW operation outside the CW/RTTY/data segment will not be considered in the following discussion. 4. CW, RTTY and data emissions are capable of operating at very narrow bandwidths, sometimes less than 100 Hz, but due to equipment limitations and current amateur practice, let us assume a communications channel using these modes to have a nominal bandwidth of 500 Hz. This is a generous allowance, considering the frequency stability and selectivity available to amateurs today using modern equipment; therefore 500 Hz spacing would allow narrowband modes more than sufficient margin to operate without mutual interference. 5. Voice and image transmissions that normally operate in the 3.75-4.0 mHz segment may occupy different bandwidths depending on the particular modes of emission used. Single sideband voice and slow-scan television may occupy less than three kilohertz, while double sideband voice and narrowband FM modes may occupy seven kilohertz or more. For the sake of discussion, let us assume nominal bandwidths of 3.0 kHz for SSB and SSTV, and 6.0 kHz for DSB and NBFM, which represent the minimum practical bandwidths that would allow for good intelligibility using these modes following present day amateur practice using equipment currently available. 6. During periods of heavy band occupancy, approximately three voice contacts will typically be heard using double-sideband voice, while the rest will be using SSB voice and slowscan TV. Under the present rules, with a total of 250 kilohertz of spectrum where voice transmission is permitted, this calculates to eighty-three 3.0 kHz voice channels with no overlapping of signals. If three channels are occupied with double sideband or NBFM communication at 6.0 kHz bandwidth each, that would leave 77 channels available for SSB/SSTV, or a total of 80 voice channels free of interference with no overlapping of signals. In actual practice, a considerable amount of signal overlap during congested conditions is to be expected. Interference is a fact of life in amateur radio communications and most amateurs operate with this expectation in mind. Therefore, in reality, the 250 kHz voice segment can accommodate considerably more than 80 voice stations transmitting simultaneously using all the various legal modes. However, for the sake of this discussion, let us consider the total number of channels that would be available with no signal overlap and use the more conservative figure of 80 stations. 7. The present rules provide 250 kilohertz of spectrum allocated exclusively for CW, RTTY and data modes. If the nominal channel bandwidth is assumed to be 500 Hertz, this would allow 500 transmitters to operate simultaneously with no signal overlap or mutual interference.
[AMRadio] Phone band expansion
This is a reminder that the comment deadline for FCC Docket 04-140 is rapidly approaching. The comment deadline is 15 June and reply comment deadline is 30 June. Amongst other things, the FCC is seeking comments on whether to adopt the ARRL's proposed phone band expansion, "refarming" the novice subbands. In my opinion, the League proposal falls short, especially on 75/80m. Generals would be able to go down to 3800, Advanced to 3750, and Extras to 3725. The total phone band would be expanded only 25 kHz. This would offer little relief to the present overcrowded conditions on the "phone" band, while most of the "cw" band lies idle even during optimum wintertime nighttime conditions on weekends. I suggest that if we must continue to have subbands, the 80/75m phone band be expanded at least down to 3600 kHz to allow a more equitable distribution of wideband vs narrowband signals and make for more effective use of the 80m amateur spectrum. Per to-day's date, the FCC has received only 85 comments on this proceeding, and fewer than half dozen address the specific issue of cw/phone or narrow/wideband allocation. The follow excerpt from the Docket addresses the subband issue. The entire document can be viewed (Adobe reader required) at: http://gullfoss2.fcc.gov/prod/ecfs/retrieve.cgi?native_or_pdf=pdf&id_document=6516185678 To electronically file comments to the FCC, go to http://www.fcc.gov/cgb/ecfs/ High Frequency Privileges: ARRL Petition. Background. On March 22, 2002, the ARRL requested that we eliminate the telegraphy frequency segments currently authorized to Novice and Technician Plus Class licensees, and to restructure the operating privileges authorized licensees in certain HF amateur service bands.33 The ARRL based its request on over 4,700 responses to a survey it conducted regarding different emission subband options for four of the eight HF amateur service bands. The ARRL notes that while the survey results did not reflect a consensus on any one HF band frequency alternative, most respondents favored dissolving the Novice and Technician Plus Class telegraphy subbands so that additional spectrum could be authorized for phone communications. The ARRL requests the Commission to amend Section 97.301 of its Rules to expand the frequency segments of the 80-, 40-, and 15 m HF amateur service bands that licensees may use for phone communications. The ARRL states that a refarming plan based on eliminating the Novice and Technician Plus Class subbands is critical because the segments presently authorized for phone and digital communications are severely overcrowded. The ARRL requests that ...General Class licensees should be authorized to control an amateur station transmitting voice communications on the 3800-4000 kHz, 7175-7300 kHz and 21275-21450 kHz frequency segments;41 (3) Advanced Class licensees should be authorized to control an amateur station transmitting voice communications on the 3750-4000 kHz and 7125- 7300 kHz frequency segments;42 and (4) Amateur Extra Class licensees should be authorized to control an amateur station transmitting voice communications on the 3725-4000 kHz and 7125- 7300 kHz frequency segments. Discussion: ... Because the ARRL Petition addresses the operating privileges of all classes of licensees on these amateur service bands, we believe that the ARRL Petition provides a basis for a comprehensive restructuring of operating privileges. We note that, as proposed, no licensees would lose any spectrum privileges and that General, Advanced, and Amateur Extra Class licensees would gain spectrum for phone emissions, one of the most popular operating modes on the HF bands. For these reasons, we will propose amending Part 97 of our Rules as the ARRL requests. We seek comment on this proposal. _ Check out the coupons and bargains on MSN Offers! http://youroffers.msn.com
[AMRadio] WTD: Elmac Receiver, Trade or Purchase
WANTED: A good looking, good-working Elmac HF receiver, PMR 6, 7 or 8, with or without Elmac power supply. Consider trade or purchase... Thanks. 73, Don Merz, N3RHT The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator.(A)
[AMRadio] FS/T: 4X150G, 5894A Tubes
For Sale Or Trade 2 used Eimac 4X150G tubes. Filaments test good. I know nothing about these. If you can use 'em, make an offer. 4 used 5894A tubes. I think these are all Amperex, but one may be another brand. Filaments are good. Otherwise untested. If you can use 'em, make an offer. Thanks. 73, Don Merz, N3RHT The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator.(A)
