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ATUs?
Yesterday, I got out an old 20m 1W xcvr along with the unbuilt 10m version. I found my old LDG ATU, which was unmarked anywhere on the enclosure. Took off the cover to find out it is an LDG QRP
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chuck adams
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#9699
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SST Manhattan update
I have crystals coming from Mouser on Friday to complete all frequencies I will ever need for any project. There was 30% added for 'estimated tariff'. I've got two sets of PCBWay boards stuck in
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chuck adams
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#9698
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Re: AA7FO VXO Crystal Table, First Pass
I have a similar Python script for FT8 frequencies, short enough to just copy/paste here. The IF list is shorter because I listed only the crystals I already have in large enough quantity to
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vbifyz
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#9697
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Re: Pulling Crystal Frequency in VXO
I'm a little late coming to the party but back in 2017 I was working with Dan AB7SQ on various ways to pull crystals using multiple crystal (up to 4) and inductor (up to 3) combinations.? I did some
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John Clements
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#9696
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Re: Pulling Crystal Frequency in VXO
All, I have a new PCB of the SST to build the 20m version. Most of the required parts is somewhere in my toolkit. But I did not find the crystals needed for the design. I have several 4 MHz but the
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PA1CJT, Kees
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#9695
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Re: Pulling Crystal Frequency in VXO
Jim, This morning I was looking at your SAVXO circuit and was saying to myself that we forgot to mention your excellent VXO! I am definitely interested in your gerber files. That will be great for our
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Alan N8WQ
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#9694
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Re: Pulling Crystal Frequency in VXO
All, I can make my Stand Alone VXO board available if folks are interested in that approach. Will work with any rig needing a VXO to work with some IF. Let me know your interest and I can post the
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Jim Kortge, K8IQY
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#9693
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Re: Pulling Crystal Frequency in VXO
Are boards available for these transceivers
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Doug Hendricks
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#9692
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Re: AA7FO VXO Crystal Table, First Pass
John et al, I must apologize.? I just mentioned the C language because I do all my stuff in it.? It's a poke at the Python and CS computer language wars.? Very sorry. It was assumed on my part that
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chuck adams
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#9691
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Re: Pulling Crystal Frequency in VXO
Folks, many years ago, Luc F6BQU designed "Le Forty", a 40 meter transceiver using a VXO. In order to enlarge the range he used two chokes in series but placed parallel to each other in the PCB, so
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Jon EA2SN / AE2SN
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#9690
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Re: uP40 Transceiver
Hi Mike I've used the TL974 in several project without issue. I use it because it's very good value for money having quite low noise of 4 nV. It's main shortcoming is that it cannot source more than a
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vk7ian@...
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#9689
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Re: AA7FO VXO Crystal Table, First Pass
For those of us not literate in C, you can do the same thing with an intermod calculator program - I use a freebee one called "PRFINTERMOD, freely available on the web. John, VK4TJ
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John Kirk
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#9688
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Re: VXO /IF combo schemes
My bad. I should have said NorCal 38S. Not sure our scope here includes thermion devices. (-: Yes I referenced bulk acoustic wave filters on a chip as something I was engaged developing. In great
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Curt
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#9687
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Re: VXO /IF combo schemes
Oh, oops.? When I was refering to a 38S I was going further back to the Hallicrafters tube receiver back in the 50s, the 1950s.
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chuck adams
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#9686
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Re: VXO /IF combo schemes
On the 38S it was designed around that large IC that who knows its its still available. Otherwise it's a normal ne602 type transceiver. That vxo and IF combo meanwhile are useful. I recall my rig
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Curt
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#9685
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Re: Pulling Crystal Frequency in VXO
All, If I were to build an SST or similar rig for 20-Meters, I would use the following crystals. IF, 3.932 MHz crystals, Mouser part number 520-HCA393-17X and for the VXO, 18 MHz crystals, Mouser part
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Jim Kortge, K8IQY
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#9684
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Re: AA7FO VXO Crystal Table, First Pass
Thanks for the great info Chuck. Good job on your C program. This will definitely help me out and I appreciate it. 73, Alan, N8WQ
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Alan N8WQ
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#9683
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Re: VXO /IF combo schemes
Curt, Thanks for the info and your observation about selectivity. I am looking at the 38S schematic. It is an interesting design. 73, Alan, N8WQ
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Alan N8WQ
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#9682
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VXO Crystal Table posting correction
1.? It's the WARC bands.? Typo on my part. ??? I'll send back my UIL typing championship trophy. ??? Now you know why my postings are so long.? :-) 2.? I restricted the band search to the CW
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chuck adams
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#9681
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AA7FO VXO Crystal Table, First Pass
If I did it, do I get to name it?? :-) I went to Aliexpress and ebay and looked up available crystal frequencies for off the shelf values.? I cheated and added one more frequency from the 1W values
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chuck adams
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#9680
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