Thanks for the feedback.

I do not have a ready supply of ferrite cores and do not really want to
wind coils.
I have surface mountable air fixed coils that provide Q 100 that I
expect should be suitable for most applications and use of trimmer
capacitors.

The only high frequency crystal oscillator I could find in the EMRFD
(100MHz) is page 4.15 which is a common base butler. I understand these
suffer parasitic effects, the tank is only effective for a limited range
of inductance. The butler emitter follower is offered as a more superior
typology but this circuit is not found in this book.
The circuit values in his example are incorrect as the 25nH inductor in
the tank requires over 100pF to resonate at 100MHz. The circuit shown
has a net capacitance of around 40pF ?
There is very little design information given with respect to ratio of
the C-Tap or emitter bias.
I also have his book "Introduction to Radio Frequency design". This does
go into more depth but is centred mainly around colpitts oscillators
(not good for harmonic crystal oscillators).





wrote:
On Mon, 28 Aug 2006 05:59:39 GMT, David
wrote:

Dave,

I do have EMIRFD but find almost all the circuits are based around rf
transformers for matching and most of them are low frequency (3MHz etc).

Up to around 200mhz thats not a big issue if properly scaled and the
right ferrite used.

I've used a lot of ideas from that book at 6 and 2m. The book list
presented is one I'd have suggested and added the venerable handbook
both current and a few older copies.

Allison


Regards

David

Dave Platt wrote:
Anyone recommend a "decent" book that would cover oscillators, small
signal RF amps and matching techniques sufficiently to enable a novice
to start experimenting with circuits and have enough detail in the text
to tweak the circuits to get them running properly ?
"Experimental Methods in RF Design" by Hayward, Campbell, and Larkin,
available from the ARRL, would be a good place to start. It's the
successor to the classic "Solid-State Design for the Radio Amateur"
from back in 1977.

If you can find copies of Doug Demaw's "Design notebook" and "QRP
notebook", there's some good reading there as well. Not as advanced
as "Experimental Methods" but perhaps a bit more accessible.

Buying a bunch of back issues of QRPp might also be helpful. In a lot
of the articles which discuss QRP receiver and transmitters, the
authors go into detail about their own particular circuit preferences,
tweaks, construction and debugging techniques, etc.

For a slightly deeper background, I'd recommend "Troubleshooting
Analog Circuits" by Robert Pease. It's not specific to RF but is full
of useful tricks and ideas.