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New amp available soon
HF Pack's K5OOR amp build IV is nearing it's release
date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Pictures of the amp are at: http://www.hfprojects.com/v2/modules...showpage&pid=1 Note: This project complys with FCC Regulations 97.3(a)(19), 97.515, and 97.317. Recently, K5OOR built and tested such an amplifiers under 97.315(b)(3)(i). It is understood that this activity was consistent with the Regulations. Currently, the group is waiting for a few more ops to sign on to the project - we need a total of at least 100 members to order the parts. Currently we have about 50 signed up. Also, I read somewhere that this may be the last run for this series so you may want to jump on the band wagon before the chance slips away! After this project is gone the only bandswitched legal QRP drive amps will be the ones like the Tokyo High Power HL50B ($300+ for 50w). So join our group and have the pride of announcing to the other end of a QSO that you are running a homebrew amp! http://www.hfprojects.com/signup/signup.html 73's de Ken KG0WX |
The amp accepts 1-2 watts drive to produce 35-40
watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Maybe I'm mistaken, but aren't commercially made amps subject to some limitations, like it can't have the ability to work 15 - 10 meters out of the box (The user has to enable that ability) and aren't they required to use a higher input to work? Or is that only limited to amps of a certian output and higher? I noticed this amp does 35 - 40 watts (A QRP amp, obviously) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com |
The amp accepts 1-2 watts drive to produce 35-40
watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Maybe I'm mistaken, but aren't commercially made amps subject to some limitations, like it can't have the ability to work 15 - 10 meters out of the box (The user has to enable that ability) and aren't they required to use a higher input to work? Or is that only limited to amps of a certian output and higher? I noticed this amp does 35 - 40 watts (A QRP amp, obviously) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com |
"VHFRadioBuff" wrote in message ... The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Maybe I'm mistaken, but aren't commercially made amps subject to some limitations, like it can't have the ability to work 15 - 10 meters out of the box (The user has to enable that ability) and aren't they required to use a higher input to work? Or is that only limited to amps of a certian output and higher? I noticed this amp does 35 - 40 watts (A QRP amp, obviously) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com You're not mistaken. The THP amp *is* a commercial amp but the K5OOR amp is NOT. It's a kit, and by FCC regs you can build one a year for your personal use. Now as to commercial amps, I believe the regs atste that it must have a drive requirement of 50 watts minimum and can't work 10 meters out of the box (15 meters is OK) Virgil, K5OOR, might be able to clarify the matter further as he seems to have done research on it. Opinion from the FCC on the project: An opinion from the FCC was sought concerning conformance to the rules and regulations. Here is their response: "The main question in your letter seems to be whether a group of amateur radio operators may pool their need to buy electronic parts and components so that each member of the group may build a project for their amateur radio station. The project is an amplifier that could be used with QRP transmitters to increase the station power to 35 watts RF output. Section 97.315(a) provides that no more than 1 unit of 1 model of an external RF power amplifier capable of operation below 144 MHZ may be constructed or modified during any calendar year by an amateur operator for use at a station without a grant of certification. The intent of the rule was to accommodate amateur radio operator's desire to be able to build one amplifier per year, or modify one amplifier per year, for use at his or her station, but to prevent an amateur radio operator from mass marketing amplifiers. Based on the description of the project that you have provided, because the amplifiers are being constructed by members of your group individually, they would be permitted under this rule. The rule does not prohibit a group of individuals from coordinating the purchase of parts to obtain a better price, or otherwise address how parts are obtained. Rather, it allows construction (or modification) of one external RF power amplifier per year capable of operation below 144 MHZ, provided this construction or modification is done by an amateur radio operator and the amplifier is for use at a station. The rule section you inquire about, Section 97.315(b) applies to any external RF power amplifier or external RF power amplifier kit manufactured, imported or modified for use in a station or attached at any station. From your description of the project, it does not appear that the coordinated buying or distribution of parts among members of the group results in an external RF power amplifier kit that is "manufactured, imported or modified for use in a station." Rather, the amplifiers are being constructed by amateur radio operators for use as part of their amateur radio stations and, therefore, my view is that Section 97.315(b) does not apply." Hope that helps Andy.... 73's de KG0WX |
"VHFRadioBuff" wrote in message ... The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Maybe I'm mistaken, but aren't commercially made amps subject to some limitations, like it can't have the ability to work 15 - 10 meters out of the box (The user has to enable that ability) and aren't they required to use a higher input to work? Or is that only limited to amps of a certian output and higher? I noticed this amp does 35 - 40 watts (A QRP amp, obviously) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com You're not mistaken. The THP amp *is* a commercial amp but the K5OOR amp is NOT. It's a kit, and by FCC regs you can build one a year for your personal use. Now as to commercial amps, I believe the regs atste that it must have a drive requirement of 50 watts minimum and can't work 10 meters out of the box (15 meters is OK) Virgil, K5OOR, might be able to clarify the matter further as he seems to have done research on it. Opinion from the FCC on the project: An opinion from the FCC was sought concerning conformance to the rules and regulations. Here is their response: "The main question in your letter seems to be whether a group of amateur radio operators may pool their need to buy electronic parts and components so that each member of the group may build a project for their amateur radio station. The project is an amplifier that could be used with QRP transmitters to increase the station power to 35 watts RF output. Section 97.315(a) provides that no more than 1 unit of 1 model of an external RF power amplifier capable of operation below 144 MHZ may be constructed or modified during any calendar year by an amateur operator for use at a station without a grant of certification. The intent of the rule was to accommodate amateur radio operator's desire to be able to build one amplifier per year, or modify one amplifier per year, for use at his or her station, but to prevent an amateur radio operator from mass marketing amplifiers. Based on the description of the project that you have provided, because the amplifiers are being constructed by members of your group individually, they would be permitted under this rule. The rule does not prohibit a group of individuals from coordinating the purchase of parts to obtain a better price, or otherwise address how parts are obtained. Rather, it allows construction (or modification) of one external RF power amplifier per year capable of operation below 144 MHZ, provided this construction or modification is done by an amateur radio operator and the amplifier is for use at a station. The rule section you inquire about, Section 97.315(b) applies to any external RF power amplifier or external RF power amplifier kit manufactured, imported or modified for use in a station or attached at any station. From your description of the project, it does not appear that the coordinated buying or distribution of parts among members of the group results in an external RF power amplifier kit that is "manufactured, imported or modified for use in a station." Rather, the amplifiers are being constructed by amateur radio operators for use as part of their amateur radio stations and, therefore, my view is that Section 97.315(b) does not apply." Hope that helps Andy.... 73's de KG0WX |
You're not mistaken. The THP amp *is* a commercial
amp but the K5OOR amp is NOT. It's a kit Ah, that's true. I missed that part. :) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com |
You're not mistaken. The THP amp *is* a commercial
amp but the K5OOR amp is NOT. It's a kit Ah, that's true. I missed that part. :) =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 73! de Andy KC2SSB - WPYI880 (GMRS) Beachwood, NJ USA! Grid FM29vw http://vhfradiobuff.tripod.com |
On Thu, 20 Nov 2003 08:35:58 -0700, "Ken Bessler"
wrote: HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. What if the exciter (a ten tec 1320) puts out 4 or 5 watts cw, and there's no convenient way to lower the output? Would that overdrive the amp? Bob k5qwg Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Pictures of the amp are at: http://www.hfprojects.com/v2/modules...showpage&pid=1 Note: This project complys with FCC Regulations 97.3(a)(19), 97.515, and 97.317. Recently, K5OOR built and tested such an amplifiers under 97.315(b)(3)(i). It is understood that this activity was consistent with the Regulations. Currently, the group is waiting for a few more ops to sign on to the project - we need a total of at least 100 members to order the parts. Currently we have about 50 signed up. Also, I read somewhere that this may be the last run for this series so you may want to jump on the band wagon before the chance slips away! After this project is gone the only bandswitched legal QRP drive amps will be the ones like the Tokyo High Power HL50B ($300+ for 50w). So join our group and have the pride of announcing to the other end of a QSO that you are running a homebrew amp! http://www.hfprojects.com/signup/signup.html 73's de Ken KG0WX |
On Thu, 20 Nov 2003 08:35:58 -0700, "Ken Bessler"
wrote: HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. What if the exciter (a ten tec 1320) puts out 4 or 5 watts cw, and there's no convenient way to lower the output? Would that overdrive the amp? Bob k5qwg Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Pictures of the amp are at: http://www.hfprojects.com/v2/modules...showpage&pid=1 Note: This project complys with FCC Regulations 97.3(a)(19), 97.515, and 97.317. Recently, K5OOR built and tested such an amplifiers under 97.315(b)(3)(i). It is understood that this activity was consistent with the Regulations. Currently, the group is waiting for a few more ops to sign on to the project - we need a total of at least 100 members to order the parts. Currently we have about 50 signed up. Also, I read somewhere that this may be the last run for this series so you may want to jump on the band wagon before the chance slips away! After this project is gone the only bandswitched legal QRP drive amps will be the ones like the Tokyo High Power HL50B ($300+ for 50w). So join our group and have the pride of announcing to the other end of a QSO that you are running a homebrew amp! http://www.hfprojects.com/signup/signup.html 73's de Ken KG0WX |
Ken Bessler wrote:
HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Who winds the inductors in this kit? If there are no instructions this could be a problem. |
Ken Bessler wrote:
HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Who winds the inductors in this kit? If there are no instructions this could be a problem. |
"ps" wrote in message ... Ken Bessler wrote: HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Who winds the inductors in this kit? If there are no instructions this could be a problem. The buyer winds the inductors. Not to worry, though - the instructions are easy to follow and well written. You can download all the instruction manuals from the HFpack site. http://www.hfprojects.com/modules.ph...download&cid=1 Basically, an example would be - pick x colored torriod, cut x inches of enamled wire, wind x turns. Simple! 73's de Ken KG0WX |
"ps" wrote in message ... Ken Bessler wrote: HF Pack's K5OOR amp build IV is nearing it's release date. The amp accepts 1-2 watts drive to produce 35-40 watts output. The amp runs class AB and is bandswitched. Operates 160, 80, 75, 60, 40, 30, 20, 17, 15, 12 & 10 meters. New to build IV is tha addition of 60 meters. Cost of the amp is only $122 for the complete kit. You can see details for this project at: http://www.hfprojects.com/ Who winds the inductors in this kit? If there are no instructions this could be a problem. The buyer winds the inductors. Not to worry, though - the instructions are easy to follow and well written. You can download all the instruction manuals from the HFpack site. http://www.hfprojects.com/modules.ph...download&cid=1 Basically, an example would be - pick x colored torriod, cut x inches of enamled wire, wind x turns. Simple! 73's de Ken KG0WX |
"Bob Miller" wrote in message ... What if the exciter (a ten tec 1320) puts out 4 or 5 watts cw, and there's no convenient way to lower the output? Would that overdrive the amp? Bob k5qwg Morning, Bob - I emailed K5OOR Virgil with your question but in the mean time I looked at the schematics. The incoming signal is fed through an attenuator. This attenuator (r2, r3 & r4) can be set up for specific rigs. Here is the matrix: DB R3 R2 R4 IN OUT RIG 3 300 18 300 2.0 1.0 K2 4 220 24 220 2.5 1.0 FT-817 5 130 43 130 3.0 1.0 Other As you can see, the amp really needs only 1 watt of drive. It would be very simple to make a pad to attenuate your 5w down to 1w. A 6db pad would take 4w down to 1w but 5w would be 1.25 watts, a little much so I'd go with a 7db pad - according to my math that would be just right. Hope that helps, Ken KG0WX |
"Bob Miller" wrote in message ... What if the exciter (a ten tec 1320) puts out 4 or 5 watts cw, and there's no convenient way to lower the output? Would that overdrive the amp? Bob k5qwg Morning, Bob - I emailed K5OOR Virgil with your question but in the mean time I looked at the schematics. The incoming signal is fed through an attenuator. This attenuator (r2, r3 & r4) can be set up for specific rigs. Here is the matrix: DB R3 R2 R4 IN OUT RIG 3 300 18 300 2.0 1.0 K2 4 220 24 220 2.5 1.0 FT-817 5 130 43 130 3.0 1.0 Other As you can see, the amp really needs only 1 watt of drive. It would be very simple to make a pad to attenuate your 5w down to 1w. A 6db pad would take 4w down to 1w but 5w would be 1.25 watts, a little much so I'd go with a 7db pad - according to my math that would be just right. Hope that helps, Ken KG0WX |
Morning, Bob - I emailed K5OOR Virgil with your question but in the mean time I looked at the schematics. The incoming signal is fed through an attenuator. This attenuator (r2, r3 & r4) can be set up for specific rigs. Here is the matrix: DB R3 R2 R4 IN OUT RIG 3 300 18 300 2.0 1.0 K2 4 220 24 220 2.5 1.0 FT-817 5 130 43 130 3.0 1.0 Other As you can see, the amp really needs only 1 watt of drive. It would be very simple to make a pad to attenuate your 5w down to 1w. A 6db pad would take 4w down to 1w but 5w would be 1.25 watts, a little much so I'd go with a 7db pad - according to my math that would be just right. Update - Virgil just sent me the specs on a 7db pad: DB R3 R2 R4 7 130.7 44.8 130.7 hope that helps, 73's de Ken KG0WX |
Morning, Bob - I emailed K5OOR Virgil with your question but in the mean time I looked at the schematics. The incoming signal is fed through an attenuator. This attenuator (r2, r3 & r4) can be set up for specific rigs. Here is the matrix: DB R3 R2 R4 IN OUT RIG 3 300 18 300 2.0 1.0 K2 4 220 24 220 2.5 1.0 FT-817 5 130 43 130 3.0 1.0 Other As you can see, the amp really needs only 1 watt of drive. It would be very simple to make a pad to attenuate your 5w down to 1w. A 6db pad would take 4w down to 1w but 5w would be 1.25 watts, a little much so I'd go with a 7db pad - according to my math that would be just right. Update - Virgil just sent me the specs on a 7db pad: DB R3 R2 R4 7 130.7 44.8 130.7 hope that helps, 73's de Ken KG0WX |
http://www.hfprojects.com/ Some nice pictures but I have a question... Who's going to be first with a 100 in 1500 out mobile kit? Lee Martin's Skywalker is nice but doesn't quite hit the mark:-) (((73))) -- Philip de Cadenet G4ZOW Transmitters 'R' Us http://www.transmittersrus.com |
http://www.hfprojects.com/ Some nice pictures but I have a question... Who's going to be first with a 100 in 1500 out mobile kit? Lee Martin's Skywalker is nice but doesn't quite hit the mark:-) (((73))) -- Philip de Cadenet G4ZOW Transmitters 'R' Us http://www.transmittersrus.com |
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