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#1
August 10th 09, 09:48 PM
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Quote:
Unless you absolutely want the experience of building, you may (I don't know the situation in Australia) be able to find a used mobile 2m or 2m/70cm tranceiver for a reasonable price. My used Yaesu FT-2800M cost me 100 Canadian dollars. I had been thinking of buying an amp for my HT but discovered it is easier to simply buy a transceiver that gives me 25 watts along with 3 other power choices. I hope the suggestion helps. Robert VE2AGE Gatineau, Quebec Canada |
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#2
August 11th 09, 03:01 PM
posted to rec.radio.amateur.homebrew
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Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
"Robert Cherry" wrote in message
... Stuart Longland;685473 Wrote: [Previously sent to rec.radio.amateur.equipment by mistake... resent here] Hi all, I was wondering if anyone knew of a solid state 2m linear amp project that I could build. I'm looking for no more than about 30W. It'll be primarily used for FM, driven from my handheld radio. Bonus points if it can do 70cm too (or at least allow pass-through unattenuated...). Most of the designs I've seen are for tubes with an output power in the KW-range... my radio license only allows me to transmit 30W FM or 100W SSB... so these are massive overkill (and not desirable for other reasons). The only project I've seen that fits the bill so far is http://www.falara.org/tektalk/GPOAmp.html which calls for a PCB made with G10 stock. I have no idea where to obtain that here in Brisbane, I have some blank PCB, but have no idea what grade it is, or how much impact on performance using it would have. The MRF1946A is also difficult to source. Does anyone know of a good project to start on this sort of thing? Regards, Stuart Longland (VK4MSL) Stuart, Unless you absolutely want the experience of building, you may (I don't know the situation in Australia) be able to find a used mobile 2m or 2m/70cm tranceiver for a reasonable price. My used Yaesu FT-2800M cost me 100 Canadian dollars. I had been thinking of buying an amp for my HT but discovered it is easier to simply buy a transceiver that gives me 25 watts along with 3 other power choices. I hope the suggestion helps. Robert VE2AGE Gatineau, Quebec Canada -- Robert Cherry Yes, and the transceiver will give you an additional advantage over your handheld - better dynamic range on receive because the filtering is better because there's more space for good filters. 73, Bob AD3K |
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#3
August 11th 09, 05:22 PM
posted to rec.radio.amateur.homebrew
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Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
On Mon, 10 Aug 2009 21:48:27 +0100, Robert Cherry wrote:
Stuart Longland;685473 Wrote: [Previously sent to rec.radio.amateur.equipment by mistake... resent here] Hi all, I was wondering if anyone knew of a solid state 2m linear amp project that I could build. I'm looking for no more than about 30W. It'll be primarily used for FM, driven from my handheld radio. Bonus points if it can do 70cm too (or at least allow pass-through unattenuated...). Most of the designs I've seen are for tubes with an output power in the KW-range... my radio license only allows me to transmit 30W FM or 100W SSB... so these are massive overkill (and not desirable for other reasons). The only project I've seen that fits the bill so far is http://www.falara.org/tektalk/GPOAmp.html which calls for a PCB made with G10 stock. I have no idea where to obtain that here in Brisbane, I have some blank PCB, but have no idea what grade it is, or how much impact on performance using it would have. The MRF1946A is also difficult to source. Does anyone know of a good project to start on this sort of thing? Regards, Stuart Longland (VK4MSL) Stuart, Unless you absolutely want the experience of building, you may (I don't know the situation in Australia) be able to find a used mobile 2m or 2m/70cm tranceiver for a reasonable price. My used Yaesu FT-2800M cost me 100 Canadian dollars. I had been thinking of buying an amp for my HT but discovered it is easier to simply buy a transceiver that gives me 25 watts along with 3 other power choices. I hope the suggestion helps. Robert VE2AGE Gatineau, Quebec Canada Oh how boring (correct, but boring). -- www.wescottdesign.com |
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#4
August 16th 09, 03:41 PM
posted to rec.radio.amateur.homebrew
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Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
Robert Cherry wrote: Stuart Longland;685473 Wrote: I was wondering if anyone knew of a solid state 2m linear amp project that I could build. I'm looking for no more than about 30W. It'll be primarily used for FM, driven from my handheld radio. Bonus points if it can do 70cm too (or at least allow pass-through unattenuated...). Stuart, Unless you absolutely want the experience of building, you may (I don't know the situation in Australia) be able to find a used mobile 2m or 2m/70cm tranceiver for a reasonable price. My used Yaesu FT-2800M cost me 100 Canadian dollars. I had been thinking of buying an amp for my HT but discovered it is easier to simply buy a transceiver that gives me 25 watts along with 3 other power choices. This is the ultimate aim... will be to purchase a newer radio. I have my eyes set on a FT-897D, but it'll require quite some saving to acquire the necessary cash. I would still like to homebrew a linear amp though, as the final stage for homebrew transceivers. This would be something that I'd be looking to do in order to improve my understanding of radiocommunications. I'm also aware that I need not use a linear amp for FM (or CW/PSK, class-C amps work for these modes), but since the homebrewing mentioned above may also include AM and SSB, I figure a linear is going to give me much better flexibility. |
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#5
August 16th 09, 11:51 PM
posted to rec.radio.amateur.homebrew
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Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
Stuart Longland wrote:
snip I'm also aware that I need not use a linear amp for FM (or CW/PSK, class-C amps work for these modes), but since the homebrewing mentioned above may also include AM and SSB, I figure a linear is going to give me much better flexibility. ========================================== Before considering a RF power amplifier for SSB operation ,get the best possible antenna(s) for the relevant bands . These will give you even better fexibility . Frank GM0CSZ / KN6WH |
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