Surplus X'tals for Homebrew
Cryptic letters are codes for Japanese/Chinese characters. English readers may skip them.

安く出回っているジャンクの水晶発振子のなかにはトランシーバの自作にその まま使えるものがたくさんあります。日本では秋葉原・日本橋のジャンク屋さんや、 CQ誌の広告の池田電子などで入手できます。大抵はひとつ 100円位です。 super VXOを使えば可変範囲は結構広くとれま す。
There are various cheap surplus X'tals on the market. Some of them are suitable for homebrew transceivers. X'tals of following frequencies are sold at very low prices in Japan. Some of them may be available also in other countries, for example, Dan's Small Parts and other shops in US. Super VXO offers you a large frequency pulling.

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Direct Frequencies

30m	10.14 MHz	fundamental
20m	14.2180, 14.3181 MHz	fundamental
15m	10.595, 10.615, 10.625, 10.635, 10.7 MHz	2 逓倍 frequency doubled
10m	14.2180, 14.3181 MHz	2 逓倍 frequency doubled
6m	8.3886 MHz	6 逓倍 8.3886*6 = 50.3316 MHz frequency sextupled (This low frequency X'tal is relatively hard to pull.)
6m	37.75 MHz (3rd overtone)	基本波の4 逓倍 (37.75/3)*4 = 50.33 MHz fundamental freq. quadrupled

これらの水晶発振子でCW/DSBダイレクト・コンバージョン方式トランシーバのVXOが作れ ます。 下の構成図を参考にして下さい。
With these X'tals, you can build VXO's for direct conversion transceivers of CW and Double Side Band modes. Refer to following example block diagrams.

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LOCAL OSC and IF/BFO for Superheterodyne

[BAND]	[LOCAL OSC (1)]	[IF and BFO(2)]	[How to get the frequency (3)]
80m	14.218 MHz	10.635 MHz	14.218 - 10.635 = 3.583 MHz(4)
80m	14.5 MHz	10.920 MHz	14.5 - 10.920 = 3.580 MHz
80m	12 MHz	8.3886 MHz	12 - 8.3886= 3.6114 MHz
40m	17.734 MHz	10.635 MHz	17.734 - 10.635 = 7.099 MHz
40m	11.5412 MHz	4.5 MHz	11.5412 - 4.5 = 7.0412 MHz
40m	10.595 MHz	3.576 MHz (color burst)	10.595 - 3.576 = 7.019 MHz
40m	10.615 MHz	3.576 MHz	10.615 - 3.576 = 7.039 MHz
40m	10.625 MHz	3.576 MHz	10.625 - 3.576 = 7.049 MHz
40m	10.635 MHz	3.576 MHz	10.635 - 3.576 = 7.059 MHz
30m	14.218 MHz	4.032 MHz	14.218 - 4.032 = 10.1860 MHz
30m	48.4611 MHz	6 MHz	48.4611/3 - 6 = 10.1537 MHz
20m	11.059 MHz	8 MHz	11.059*2 - 8 = 14.118 MHz
17m	10.14 MHz	8 MHz	10.14 + 8 = 18.14 MHz
17m	10.16 MHz	8 MHz	10.16 + 8 = 18.16 MHz
17m	10.17 MHz	8 MHz	10.17 + 8 = 18.17 MHz
17m	22.1184 MHz	4.032 MHz	22.1184 - 4.032 = 18.0864MHz(5)
15m	17.734 MHz	3.576 MHz	17.734 + 3.576 = 21.310 MHz
15m	15.36 MHz	6 MHz	15.36 + 6 = 21.36 MHz
12m	16 MHz	9 MHz	16 + 9 = 25 MHz
10m	18 MHz	10.14 MHz	18 + 10.14 = 28.14 MHz
10m	18 MHz	10.16 MHz	18 + 10.16 = 28.16 MHz
10m	18 MHz	10.17 MHz	18 + 10.17 = 28.17 MHz
10m	18 MHz	10.18 MHz	18 + 10.18 = 28.18 MHz
10m	18 MHz	10.24 MHz	18 + 10.24 = 28.24 MHz
10m	18 MHz	11.5412 MHz	18 + 11.5412 = 29.5412 MHz
6m	15.36 MHz	4.032 MHz	15.36*3 + 4.032 = 50.112 MHz
6m	14.96 MHz	5.4 MHz	14.96*3 + 5.4 = 50.28 MHz
6m	14.99 MHz	5.4 MHz	14.99*3 + 5.4 = 50.37 MHz

(1)これらの水晶発振子でスーパーヘテロダイン方式トランシーバのVXO式局部 発振器が作れます。
(2)これらの水晶発振子でスーパーヘテロダイン方式CW/SSBトランシーバのBFO や搬送波発振器、ラダー型クリスタルフィルターが作れます。 6 MHzより低い周波数の水晶発振子はSSB用クリスタ ルフィルターには 適しません。
(3)局部発振器の水晶発振子によっては一概には言えませんが、 この周波数から低い方におよそ 50 - 100 kHz 周波数を変化させることができます。
(4)この組合せはスプリアスがIFに入るのであまりお勧めしません。
(5)この組合せはK8IQY、Jim Kortge氏 から教えてもらいました。感謝。

下の構成図を参考にして下さい。
(1)With these X'tals, you can build VXO local oscillators for superheterodyne transceivers.
(2)With these X'tals, you can build BFO's, carrier oscillators and ladder X'tal filters for CW/SSB superheterodyne transceivers. X'tals with frequency less than 6 MHz are not suitable for the SSB filter.
(3)You can pull the frequency downwards by about 50 to 100 kHz depending on the X'tal used for the local oscillator.
(4)This combination is not recomended because of a spurious frequency into IF.
(5)Thanks to Jim Kortge, K8IQY for this new addition.

Refer to following example block diagrams.

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MINOWA, Makoto
7N3WVM
Last revised 1997-09-19.