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On 5 Jan 2004 08:23:16 -0800, Winfield Hill
wrote: Paul Burridge wrote... You're right. I can't believe I posted that load of nonsense. Maybe it's a case of "late onset mad cow disease." :-| OK, you are forgiven, my son. Go and sin no more. Yes, m'lud. In mitigation I'd like to plead Jack Daniels. :-) -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
On Mon, 05 Jan 2004 09:14:28 -0800, Jim Weir wrote:
If you aren't using the turnip truck you just fell from, could I borrow it for a while? {;-) Hehe! Fair comment. Thank God I don't have any reputation to lose on this group. :-) -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
On Mon, 05 Jan 2004 09:14:28 -0800, Jim Weir wrote:
If you aren't using the turnip truck you just fell from, could I borrow it for a while? {;-) Hehe! Fair comment. Thank God I don't have any reputation to lose on this group. :-) -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
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Motorola's first solid state 450 car phone, the MK, used a 50 W 150 MHz PA
followed by a varactor tripler for 10W at 450. Varactor triplers are tricky however. Steve K;9;d/c/i "Paul Burridge" wrote in message ... On Sun, 4 Jan 2004 16:22:32 -0800, "Tim Wescott" wrote: The varactor capacitance change is instantaneous -- think of a capacitor who's plate spacing is dependent on it's voltage. This is why varactors are used for frequency multiplication -- that capacitance change "squeezes" the pulse to generate lots of harmonics. Rubbish. Varactors are not used for freqency mulitplication. They are freequenty used in VXCOs for modulating (or otherwise varying) the oscillator output frequency by means of applying a DC bias voltage which alters the capacitance of the PN junction. -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
Motorola's first solid state 450 car phone, the MK, used a 50 W 150 MHz PA
followed by a varactor tripler for 10W at 450. Varactor triplers are tricky however. Steve K;9;d/c/i "Paul Burridge" wrote in message ... On Sun, 4 Jan 2004 16:22:32 -0800, "Tim Wescott" wrote: The varactor capacitance change is instantaneous -- think of a capacitor who's plate spacing is dependent on it's voltage. This is why varactors are used for frequency multiplication -- that capacitance change "squeezes" the pulse to generate lots of harmonics. Rubbish. Varactors are not used for freqency mulitplication. They are freequenty used in VXCOs for modulating (or otherwise varying) the oscillator output frequency by means of applying a DC bias voltage which alters the capacitance of the PN junction. -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
On Tue, 6 Jan 2004 17:26:59 -0600, "Steve Nosko"
wrote: Motorola's first solid state 450 car phone, the MK, used a 50 W 150 MHz PA followed by a varactor tripler for 10W at 450. Varactor triplers are tricky however. Steve K;9;d/c/i The worst is suppression of 150MHz, it is almost impossible to suppress it. Bought some UK commercial integrated modules for 432MHz which was fed from 144MHz 1W, had a 20W amplifier within a very well screened and silvered box, but radiation on 144MHz were almost impossible to suppress, the only way out was to place it deep at the lowest point of the basement with ferrite chokes on the cables LA8AK -- Amount of SPAM is so large that MailWasher must delete 99% of the incoming mails Cannot check every email manually. Please use intelligent title for email. Mails without titles or using just "hi" is deleted |
On Tue, 6 Jan 2004 17:26:59 -0600, "Steve Nosko"
wrote: Motorola's first solid state 450 car phone, the MK, used a 50 W 150 MHz PA followed by a varactor tripler for 10W at 450. Varactor triplers are tricky however. Steve K;9;d/c/i The worst is suppression of 150MHz, it is almost impossible to suppress it. Bought some UK commercial integrated modules for 432MHz which was fed from 144MHz 1W, had a 20W amplifier within a very well screened and silvered box, but radiation on 144MHz were almost impossible to suppress, the only way out was to place it deep at the lowest point of the basement with ferrite chokes on the cables LA8AK -- Amount of SPAM is so large that MailWasher must delete 99% of the incoming mails Cannot check every email manually. Please use intelligent title for email. Mails without titles or using just "hi" is deleted |
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