Dear Miguel,
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Hi!
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This all is very interesting. I feel some correction is in order for 80mts range mentioned. But what I am more interested is the 18mhz tuning you mention, it makes making a 20mtr radio with 4mhz IF and 18mhz LO a snap. 400khz range gives more than adequate 20mtrs coverage.
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Worth trying.
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Greetings and 73
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Rahul VU3WJM
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Miguel Angelo Bartie wrote:
Hello
I build 3 VXOs called "hipervxos" for 40m, 20, and 10m to use with BITX,
They use a classic Colpits oscilattor with 3 parallel xtals and a
series? inductor (special) and a series variable capacitor
For 40m I use 3 x 3020 kHz xtals and the actual range is 2068 to 3010kHz
For 20m I use a commercial 3 x 4194 kHz xtals covering 4190 to 3990 kHz
For 10m I use a commercial 3 x 18432 kHz xtals covering 18400 to
18000kHz.
The BITX 40m is running good, the 20m still in test (but is ok too),
and the 10m version I built only the VXO.
The exciter and the PA are the same I change the vfo, the band pass
filter and the low pass filter.
I will make some pictures and I will post here.
73 from PY2OHH Miguel
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