Arnie, Both Steve and I pored through SSDRA, and neither of us found a Hartley-based VFO that didn't use FETS... anywhere else we could look that would have a similar circuit?
Or, would would be our next best alternative for the VFO, factoring in the best mix of simplicity and stability?
I thought, and I need to back and read again, That they used Bipolar transistors IN PLACE of the FETS. As the FETs were unavailable. And the Bipolar ones were salvaged from some consumer item.
----- Original Message ---- From: Jason W6IEE <w6iee...@gmail.com> To: homebrew-dual-sideband@googlegroups.com Sent: Wed, October 13, 2010 2:13:37 PM Subject: [homebrew-dual-sideband:0] Super Islander VFO?
Arnie, Both Steve and I pored through SSDRA, and neither of us found a Hartley-based VFO that didn't use FETS... anywhere else we could look that would have a similar circuit?
Or, would would be our next best alternative for the VFO, factoring in the best mix of simplicity and stability?
On Thu, Oct 14, 2010 at 5:43 AM, Jason W6IEE <w6iee...@gmail.com> wrote: > Arnie, Both Steve and I pored through SSDRA, and neither of us found a > Hartley-based VFO that didn't use FETS... anywhere else we could look > that would have a similar circuit?
> Or, would would be our next best alternative for the VFO, factoring in > the best mix of simplicity and stability?
Hi Jason,
I don' t have SSDRA or EMRFD, yet. My experience is a bit limited, so I started with a Pixie ][ and used its crystal controlled oscillator for most other projects, receivers mostly.
Its usually implemented with a 2N2222 or a BC548 or 2N3904. Its stable enough when used with a voltage regulator and encased in an inch of polystyrene foam. What we in VK call an esky, perhaps what you would call a cooler.
72,
Kim VK5FNET -- "Art without engineering is dreaming; engineering without art is calculating." --SKR
