Project 3: 80M xmtr with VFO

---------

From: ABRC000 (ABRC%CATCC.BITNET@VTVM1.CC.VT.EDU)
Date: Mon Aug 02 1993 - 12:56:07 EDT


>
>
>
> Hi Gang:
> An opinion from someone at our law school is not to worry about
> any copyright violations; email me for full details.
> This week we have an 80 meter 1/10 watt output xmtr with a VFO!
> Not too many of us still have a drawer full of xtals (gave all my
> away when I sold my DX-60).
> Construction is pretty straightforward. C5 is the VFO-frequency-
> adjust control, while C4 acts as a preset calibrator. Output is
> governed by setting of C9.
> It is most important to shield the VFO section entirely (including
> Q1); this will prevent hand capacitance from pulling you off frequency.
>
> PARTS LIST
>
> C1 .002 uF cap
> C2 500 pF cap
> C3 1000 pF cap
> C4 15 pF variable cap
> C5 51 pF variable cap
> C6 100 pF cap
> C7, C8 .015 uF cap
> C9 76 pF variable cap
> C10 .0015 uF cap
> L1 57 turns of Air Dux 832 (or equiv.)
> L2 35 turns of B&W 3016 (or equiv.)
> L3, L4 2.5 mH rf choke (National R-100 or equiv.)
> M1 0-15 dc milliammeter
> M2 12 volt battery
> Q1 2N744 transistor
> Q2 2N852 transistor
> R1 120K resistor
> R2 100K resistor
> R3 2.2K resistor
> R4 2.4K resistor
>
>
> -------------------------------------------- ANT
> | | |
> | | |
> | | |
> *----------R3-----------L3 | C10
> | | | |
> | | | |
> R1 | | --B-Q2-C--------*
> | | | | | |
> | | | | E |
> *-------*-------B-Q1-C---* | | | |
> | | | | | | | -----*----
> | | E | | | GND | |
> | | | | | | | |
> R2 C1 | *------- |--------(----- | |
> | | | | | | | C9 L2
> | | | | | | | | |
> GND GND | C2 L1 | | | |
> | | | | | ----*-----
> | | | | | |
> *-----*------(-------C6----------* | |
> | | | | | M1
> | | | | | |
> R4 C3 *------ L4 ----------*----|
> | | | | | | |
> | | | | | | +
> GND GND C5 C4 GND C8 M2
> | | | |
> | | | |
> GND GND -----KEY------*-----
> | |
> | |
> *-----C7-------
> |
> |
> GND
>
>
> Notes: * indicates a junction of 3 leads. ( indicates a jump. B = base,
> C = collector, E = emitter. KEY = manual telegraph key. GND = ground.
>
> Coming attractions: 1 transistor 160 meter xmtr; 3 transistor 2 meter xmtr;
> 15 meter xmtr; other goodies, too!
>
> .... ...- ..-. ..- -.
>
> Jeff NH6IL . .
>
> Jeffrey Herman, University of Hawaii Mathematics, jherman@hawaii.edu
>
>
If I remember correctly you said that these were out of an old book.
In the august QST they said to be careful of old articles because
the circuits may not meet current FCC signal purity requirements.
See august QST for the full details. I don't know if this circuit
meet's the standards or not It's just something to consider.

******************************************************************
* Rodney Clayton KA3BHY Howard County Public Schools *
* Ellicott City, MD USA *
* Systems Programmer ABRC@CATCC.BITNET *
******************************************************************


Search QRP-L Archives

[ QRP-L Archive | ]
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]

---------

This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:26:12 EDT

kd4ab@kd4ab.org