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220Mhz ACSB amplifier

Tyler- WZ5TX All Messages By This Member #214304 I have a few of these LMM 220 amplifiers.? I drive it with .05w and it gives me 113W or so output. From the analyzer it looks very clean. Of course these amps were not made for FM. I have seen a few past posts where people would talk about these and several are in use, but there is only one post where someone said to bypass a capacitor to use on fm. No mention what cap he is referring to. For those who are familiar with this amp, enlighten me on your expirence or knowledge. ? It would be real nice to convert the exciter and receiver to fm! That’s fairyland thinking… ? 73 WZ5TX ? ?
MICHAEL MAY All Messages By This Member #214326 All 220 Linear amps should work great on 220 FM without any mods except maybe the addition of a small fan but even the fan isn't really required. ? ?I had several Morrow electronics/UPS Aviation Technology/Garmin Aviation Technology 50 watt 220 MHz Linear amps from the days when they stole the lower half of the 220 ham band and they all work just fine on 220 FM for my remote base and as mobile amps without any mods at all. ? I added a small fan but even without the fan I haven't killed any yet but for me it was a psychological thing just knowing that the transistor junction temp was always going to be below the data book max.? even if stuck in tx for an hour. ? My amps are all around 50 watts out each and with a home brew wilkinson? combiner I have? around 90 watts going to the antenna.
Brandon DX All Messages By This Member #214329 Interesting subject and? Mike will 6M open to Oregon this year? I evaluated a Linear Modulation Tech PA, w/ 24Vdc it took a +8dBm input to deliver 100W CW. I considered using one for my ACSB repeater (yeah, really!) I built a 2 channel combiner for it (pic attached). I combined 2 systems successfully, the short cavities are special design for a bit broader tuning for ACSB (thanks Wacom!)? I was testing them into a commercial 200W PA made for a military application (all mode) then I accidentally switched it open circuit for a few millisecs (long story) and it went into oscillation and blew a transistor so the project was put on hold. I intend to repair it or replace it with an ESP1100 PA.?? ? I believe James KB0HNX is using a Securicor PA for their 220 FM rptr in Nixa MO. He frequents the forum and might add how they are cooling it.? Reid? W6MTF? ACSB combiner 2022.jpg
Ken Arck AH6LE All Messages By This Member #214330 6M has been open MANY times over the past month or 2 to Oregon. And since we're at the peak of the cycle, this summer should be great! South America, the Caribbean, South Pacific. Tons of DX Ken At 12:46 PM 4/5/2025, you wrote: Interesting subject and? Mike will 6M open to Oregon this year? I evaluated a Linear Modulation Tech PA, w/ 24Vdc it took a +8dBm input to deliver 100W CW. I considered using one for my ACSB repeater (yeah, really!) I built a 2 channel combiner for it (pic attached). I combined 2 systems successfully, the short cavities are special design for a bit broader tuning for ACSB (thanks Wacom!) I was testing them into a commercial 200W PA made for a military application (all mode) then I accidentally switched it open circuit for a few millisecs (long story) and it went into oscillation and blew a transistor so the project was put on hold. I intend to repair it or replace it with an ESP1100 PA.? ? I believe James KB0HNX is using a Securicor PA for their 220 FM rptr in Nixa MO. He frequents the forum and might add how they are cooling it. Reid? W6MTF ------------------------------------------------------------------------------ President and CTO - Arcom Controllers Makers of repeater controllers and accessories Phone: (503) 678 6182 Authorized Dealers for Kenwood and Telewave. We offer complete turn-key repeater packages! "We don't just make 'em. We use 'em!"
Chris Boone WB5ITT All Messages By This Member #214339 You guys are making me sick here. I haven't heard of people in 6 m down here in Southeast Texas and it's one of my favorite bands!? Chris WB5ITT? toggle quoted message Show quoted text On Sat, Apr 5, 2025, 3:13 PM Ken Arck AH6LE via <ken=[email protected]> wrote: 6M has been open MANY times over the past month or 2 to Oregon. And since we're at the peak of the cycle, this summer should be great! South America, the Caribbean, South Pacific. Tons of DX Ken At 12:46 PM 4/5/2025, you wrote: Interesting subject and? Mike will 6M open to Oregon this year? I evaluated a Linear Modulation Tech PA, w/ 24Vdc it took a +8dBm input to deliver 100W CW. I considered using one for my ACSB repeater (yeah, really!) I built a 2 channel combiner for it (pic attached). I combined 2 systems successfully, the short cavities are special design for a bit broader tuning for ACSB (thanks Wacom!) I was testing them into a commercial 200W PA made for a military application (all mode) then I accidentally switched it open circuit for a few millisecs (long story) and it went into oscillation and blew a transistor so the project was put on hold. I intend to repair it or replace it with an ESP1100 PA.? ? I believe James KB0HNX is using a Securicor PA for their 220 FM rptr in Nixa MO. He frequents the forum and might add how they are cooling it. Reid? W6MTF ------------------------------------------------------------------------------ President and CTO - Arcom Controllers Makers of repeater controllers and accessories Phone: (503) 678 6182 Authorized Dealers for Kenwood and Telewave. We offer complete turn-key repeater packages! "We don't just make 'em. We use 'em!"
Tyler- WZ5TX All Messages By This Member #214345 开云体育 Chris, What are you referring to? WZ5TX David “Tyler” Bufkin toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Chris Boone WB5ITT via groups.io <setxtelecom@...> Sent: Saturday, April 5, 2025 5:11:42 PM To: [email protected] <[email protected]> Subject: Re: [repeater-builder] 220Mhz ACSB amplifier ? You guys are making me sick here. I haven't heard of people in 6 m down here in Southeast Texas and it's one of my favorite bands!? Chris WB5ITT? On Sat, Apr 5, 2025, 3:13 PM Ken Arck AH6LE via <ken=[email protected]> wrote: 6M has been open MANY times over the past month or 2 to Oregon. And since we're at the peak of the cycle, this summer should be great! South America, the Caribbean, South Pacific. Tons of DX Ken At 12:46 PM 4/5/2025, you wrote: Interesting subject and? Mike will 6M open to Oregon this year? I evaluated a Linear Modulation Tech PA, w/ 24Vdc it took a +8dBm input to deliver 100W CW. I considered using one for my ACSB repeater (yeah, really!) I built a 2 channel combiner for it (pic attached). I combined 2 systems successfully, the short cavities are special design for a bit broader tuning for ACSB (thanks Wacom!) I was testing them into a commercial 200W PA made for a military application (all mode) then I accidentally switched it open circuit for a few millisecs (long story) and it went into oscillation and blew a transistor so the project was put on hold. I intend to repair it or replace it with an ESP1100 PA.? ? I believe James KB0HNX is using a Securicor PA for their 220 FM rptr in Nixa MO. He frequents the forum and might add how they are cooling it. Reid? W6MTF ------------------------------------------------------------------------------ President and CTO - Arcom Controllers Makers of repeater controllers and accessories Phone: (503) 678 6182 Authorized Dealers for Kenwood and Telewave. We offer complete turn-key repeater packages! "We don't just make 'em. We use 'em!"
MICHAEL MAY All Messages By This Member #214359 Ken, ? We had boxes of 50 watt 220 linear amps in a cabinet down here at Garmin in Salem never touched for 15 years. ? When I retired in January of this year I heard that they tossed everything in a recycling box and given to a recycler out in Independence? Or.. ? ?
Hudson, John@CalOES All Messages By This Member #214364 开云体育 Chris, I monitor 52.525 on my Syntor X9000 and 50.125 USB on a Kenwood TS-570DG 24/7 here in San Diego. We’ve had many openings including JA’s and points north. So many of us are listening. John, WA6HYQ toggle quoted message Show quoted text On Apr 6, 2025, at 09:43, MICHAEL MAY via groups.io <may2142@...> wrote: ? This Message is From an External Sender This message came from outside your organization. Ken, ? We had boxes of 50 watt 220 linear amps in a cabinet down here at Garmin in Salem never touched for 15 years. ? When I retired in January of this year I heard that they tossed everything in a recycling box and given to a recycler out in Independence? Or.. ? ? WARNING: Do not click links or attachments unless you recognize the sender and know the email is safe.
Tyler- WZ5TX All Messages By This Member #214376 开云体育 Bummer on the recycled amps! WZ5TX David “Tyler” Bufkin toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Hudson, John@CalOES via groups.io <john.hudson@...> Sent: Sunday, April 6, 2025 3:05:18 PM To: [email protected] <[email protected]> Cc: [email protected] <[email protected]> Subject: Re: [repeater-builder] 220Mhz ACSB amplifier ? Chris, I monitor 52.525 on my Syntor X9000 and 50.125 USB on a Kenwood TS-570DG 24/7 here in San Diego. We’ve had many openings including JA’s and points north. So many of us are listening. John, WA6HYQ On Apr 6, 2025, at 09:43, MICHAEL MAY via groups.io <may2142@...> wrote: ? This Message is From an External Sender This message came from outside your organization. Ken, ? We had boxes of 50 watt 220 linear amps in a cabinet down here at Garmin in Salem never touched for 15 years. ? When I retired in January of this year I heard that they tossed everything in a recycling box and given to a recycler out in Independence? Or.. ? ? WARNING: Do not click links or attachments unless you recognize the sender and know the email is safe.
Tyler- WZ5TX All Messages By This Member #214377 These already have fans in them. Power supply too. these amps are 28v. working good so far. The way I look at it is, they are clean and they put out plenty of power. If they fail, so be it. Better than them sitting in the garage untouched!

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