EMRFD Message Archive 3880

Message Date From Subject
3880 2009-12-17 20:33:55 Ken Evans FDIM 2010 QRP Challenge Clarification
A number of questions have surfaced since we announced the FDIM 2010 QRP
challenge. In an effort to clarify the rules, we have added an FAQ section
to the announcement found at http://www.qrparci.org/fdim72 . The initial
questions are listed below.
Keep in mind, the objective first is to have fun. We also hope to get some
designs with minimum parts counts that may interest the beginners among us.

1. Can I use MOSFETs and voltage regulators?
Yes, MOSFETs and voltage regulators are considered a discrete

2. What about IF Cans, Xtal filters and mixers - are they considered
discrete components?
Mixers such as SBL-1, TUF-1, canned xtal filters, IF cans (XFMR with
trim cap) will all be permitted, but the component count must
include internal discrete components. For example, if you use an
SBL-1 - it counts as six
components. (Two xfmrs and four diodes).

3. Will I be disqualified if I use more than one IC?
One IC may be used and counted as one component. If you chose to
use a second IC, you must count the internal components towards the 72
allowed. For example, an LM 386 looks like 19 components, so if that
is your second IC, it would count as 19 components of the 72.

4. Are vacuum tubes allowed?
Yes and the filament transformer does not count as a component.
3881 2009-12-17 20:42:18 Ashhar Farhan Re: FDIM 2010 QRP Challenge Clarification

thanks for the clarifications ken,.. now that you've mentioned valves,
does the 6AJ8/ECH81 count at two devices? (it is a heptode+triode in
one envelope). don't bother, ... just kidding :)

- farhan