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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Re\:\s+RE\:\s+G0MRF\s+300w\s+Tx\s+PA\s+mods\s*$/: 5 ]

Total 5 documents matching your query.

1. LF: Re: RE: G0MRF 300w Tx PA mods (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 4 Jul 2005 22:09:12 +0100
Hi Gary, as you are monitoring the match with a "Jim and Lech" match indicator, I doubt there is much problem there. I have had another thought, which refers to the physical wiring against the "schem
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-07/msg00176.html (14,521 bytes)

2. LF: Re: RE: G0MRF 300w Tx PA mods (score: 1)
Author: "Scott Tilley" <[email protected]>
Date: Mon, 4 Jul 2005 13:57:26 -0700
Gary Usually core saturation will cause the over current protection to trip and save the finals... I figure you have an SWR problem... I haven't had time to read the thread forming but that seems lik
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-07/msg00178.html (13,114 bytes)

3. LF: RE: RE: G0MRF 300w Tx PA mods (score: 1)
Author: "Dave Pick" <[email protected]>
Date: Mon, 4 Jul 2005 21:04:11 +0100
Gary That's strange. I would be happier with some 50A FETs, I rather like the IXYS IXFH58N20 but the ones you are using should be OK... I suppose the FETs are well clamped down with not too much heat
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-07/msg00179.html (12,607 bytes)

4. LF: Re: RE: G0MRF 300w Tx PA mods (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 4 Jul 2005 18:56:48 +0100
Hi Gary, I have exchanged a several e-mails with Fritz Rabb, who is cordinating the ARRLs 500kHz experiment. He has done extensive work on high efficiency PAs, and has co-authoured papers with Nat So
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-07/msg00183.html (14,482 bytes)

5. LF: RE: RE: G0MRF 300w Tx PA mods (score: 1)
Author: "Dave Pick" <[email protected]>
Date: Mon, 4 Jul 2005 18:23:55 +0100
Gary. Have you any SWR protection on the TX? I would doubt if the cores would saturate so quickly that you didn't notice the heat and drop-off in power before it went pop! SWR protection is essential
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-07/msg00184.html (12,734 bytes)


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