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Submitted by DF7TV on Sat, 04/12/2008 - 03:03.
The assembly and testing of the RXTXv6.2 - 20m/30m transceiver kit made by Tony, KB9YIG is the subject of this blog. Acquiring the needed informations, doing the inventory, populating the circuit board and testing of several sections of the circuit are described by DF7TV. The N2PK daughter board here replaces the original oscillator circuit of the RXTXv6.2 circuit board. This blog only reflects the way I built the kit. For your own assembly of the RXTXv6.2 - 20m/30m always use the official (and up-to-date) builder notes supplied by Tony, KB0YIG. April 16, 2008 Manuals related to the RXTXv6.2 - 20m/30m kit may be downloaded from the "Files" section of the "softrock40" Yahoo group. Look for the "/RXTXv6.2 files/RXTXv6.2 20m_30m files" folder. The schematic of November 6, 2007 and the bill of materials of November, 24, 2007 are used for this assembly. The schematic of the 20m/30m Daughter Board (by N2PK) used shows the date November 19, 2007 at its legend.
May 18, 2008 Prepared pictures showing the pinouts of semiconductors used in the RXTXv6.2 20m/30m.
I prepared a document (pdf) with some illustrating figures concerning the assembly of the RXTXv6.2 - 20m/30m transceiver . This file includes the above illustrations of the semiconductor pinouts, placement of ICs on the bottom of the board and some figures which I prepared for my understanding of the transformers T1 to T4. I used the system of notation found in the builder notes concerning "first/second" and "primary/secondary" windings of these transformers. Data sheets of the semiconductors used in this kit (I added also some of the semiconductors which may be used for individual modifications) may be downloaded from my K2 Semiconductor Data Sheets page. May 24, 2008 According to a message at the softrock40 group the FST3253M (Fairchild) is better suited at U3 and U7 for higher frequencies, in particular for a 10m/12m kit. Even so this change may not be necessary for the 20m/30m RXTX I changed U3 and U7 to be FST3253M instead of SN74CB3253CDR (Texas Instruments). So far the SN74CB3253CDR was listed at the blog entry of April 16, 2008.
Assembly of the N2PK 20m/30m Daughter Board May 31, 2008
June 7, 2008
June 8, 2008
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