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Re: Spark Gap Tubes
Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
I don't know that the alpha source in a smoke detector would
a) have energetic enough particles... yes, they're 5 MeV alphas, but they
don't go very far before hitting an air molecule
b) have a high enough rate to make a difference. 1 uCi is 27,000
disintegrations/sec (as I recall) and they're distributed over 4pi, so most
won't be in the gap.
I've seen UV (short wavelength) and some strong gamma emitters used for this
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
Sent: Thursday, September 18, 2003 4:11 PM
Subject: RE: Spark Gap Tubes
> Original poster: "Edward J. Metzler" <emetzler-at-accredo-dot-com>
> I am a newbie so please excuse my question if it is stupid or has been
> answered before.
> I wonder if anyone has ever used a Alpha radioactive source (like those in
> smoke detectors) to ionize the spark gap and see if it produces for
> consistent sparks?
> Edward J. Metzler
> aCCredo - Proactive Risk Management
> 13267 SW Bull Mountain Road, Tigard, OR 97224
> (503) 624-2124) (503) 624-5723 [fax] (503) 805-7758 [cell]
> email: emetzler-at-accredo-dot-com
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Thursday, September 18, 2003 10:35 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Spark Gap Tubes
> Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
> Indeed, they are designed for high peak power and low average power. The
> idea is that they are in the waveguide heading to the receiver. The high
> transmit power causes them to ionize, forming a short in the waveguide,
> protecting the receiver. When placed the right distance from the hybrid T,
> the short looks like an open to the transmit power.
> Often, these tubes have a bias voltage to keep them "simmering" so that
> reliably fire.
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, September 18, 2003 2:43 AM
> Subject: Spark Gap Tubes
> > Original poster: jwhitmor-at-muscanet-dot-com > > Anyone have experience
> spark gap tubes > (sometimes called TR tubes) from radar modulators?
> > I checked the archives and found a brief mention, > but it does not
> like anyone experimented with > them. They were referred to as vacuum
> but > this is incorrect, since they are gas filled and often >
> pressurized. They seem to have impressive > specifications, but the
> construction does not look > like it could support the power levels
> My > guess is the peak power is high, but the average > power must be
> rather modest. I have a 1B22 which > is rated at 67AMPS for 0.75ms at
> PPS, or > 2.25ms pulses at 330 PPS. Conduction starts at > 2.7KV, about
> MOT range. Big problem is, no > adjustments to the gap are possible.
> > Jimbo jwhitmor-at-muscanet-dot-com