Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
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) |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
On Aug 9, 9:38*pm, Stuart Longland 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...). Just realised I was in the wrong newsgroup... I shall re-post. More relevant to this thread though, alternatively, does anyone know of any commercially-made linear amps that fit this requirement, and where they can be obtained? (I suspect they'd be more expensive than a 30W FM rig though.) Regards, Stuart Longland VK4MSL |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
On Sun, 9 Aug 2009 04:38:14 -0700 (PDT), Stuart Longland
wrote: 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) You don't need linear operation for FM. This should increase the number of choices you have. |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
John Ferrell wrote:
On Sun, 9 Aug 2009 04:38:14 -0700 (PDT), Stuart Longland wrote: .... 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) You don't need linear operation for FM. This should increase the number of choices you have. Here are some kits that don't suck: http://www.communication-concepts.co...amplifiers.htm |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
You might try he http://www.communication-concepts.com/335a.htm
This is a 35 watt SSB-FM amp in a variety of kit forms. 73, Erich N6FD Stuart Longland wrote: 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) |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
Erich wrote:
You might try he http://www.communication-concepts.com/335a.htm This is a 35 watt SSB-FM amp in a variety of kit forms. Hi, Yeah... that looks like a promising kit... not sure if I can get anything like that locally (Australia; I don't possess a credit card or direct debit facilities) so that may be a limitation there... I've been pointed to a couple of kits in the homebrewing section that are based on a Mitsubishi power amp module. I found one based on this module that I can get locally, it was rather minimalist however. This does give me some other possibilities to chase up however. I am aware that I need not use a linear amp for FM/CW/PSK too by the way... but since future use may include AM and SSB, I figure chasing this sort of amplifier would give me greater flexibility. The aim is to have a suitable power amp that can work with homebrew equipment. Regards, Stuart Longland (VK4MSL) |
Homebrew 2m (and maybe 70cm) linear (solid state, 20~30W)
Stuart Longland wrote:
Erich wrote: You might try he http://www.communication-concepts.com/335a.htm This is a 35 watt SSB-FM amp in a variety of kit forms. Hi, Yeah... that looks like a promising kit... not sure if I can get anything like that locally (Australia; I don't possess a credit card or direct debit facilities) so that may be a limitation there... I've been pointed to a couple of kits in the homebrewing section that are based on a Mitsubishi power amp module. I found one based on this module that I can get locally, it was rather minimalist however. This does give me some other possibilities to chase up however. I am aware that I need not use a linear amp for FM/CW/PSK too by the way... but since future use may include AM and SSB, I figure chasing this sort of amplifier would give me greater flexibility. The aim is to have a suitable power amp that can work with homebrew equipment. Regards, Stuart Longland (VK4MSL) Why don't you send them an email. They are a small company and will probably give you excellent service. http://www.communication-concepts.com/default.htm |
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