If anyone can fill in the blanks, please let me know. Tnx Jim
N3QYE
| TenTec | SW+ | Emtech NWxx+ | NorCal 40a | |
| Bands | 40/30/20 | 80/40/30/20 | 80/40/30/20 | 40 |
| Modular Build and Test | yes | yes | yes | (info avail) |
| Bandwidth | 50 KHz | 35-40 KHz (wider w/ mod*) | 70 KHz/ 20m, 200/40m, 250/80m | 40 KHz (150 KHz mod) |
| RIT | 1.5 KHz | universal $6 de Dan's, $18 from SWL | yes | yes |
| Size | 2.75 x 6 x 6 | 2.8 x 4.0 (4.2x4.2x2.1) | 2.5 x 6.5 x 5.5 | 2.5 x 4.5 x 4.5 |
| VFO | varactor tuned oscillator w/ pot ctrl
Temp compensated LC components |
local oscillator, temp stable, vari-cap tuning diode | open-air variable capacitor, FET oscillator | temp compensated pot. tuned oscillator |
| Power (idle current) | 12-14VDC (35mA) | (16mA) | 13.5v (58mA) | (15mA) |
| RX S9 | 80 mA | |||
| TX | 3w, 800mA | 1-2w (4-5w mod), 300-350mA | mW-6.2w, 138mA | 1.8-3w |
| QSK | full | full | yes | yes |
| Sidetone | 400-1000Hz, internal adj. | internal adj. | ||
| Receiver | Single Conversion superhet, JFET mixer | Superhet w/ filters | Single conversion superhet | superhet |
| Sensitivity | 0.25 uV for 10dB S/N | 0.07uV for -130dBm | ||
| Selectivity (IF Filter) | 4 pole crystal ladder filter (1KHz nom bandwidth) | 3 pole crystal filter, -6dB is 500 Hz* | 4-pole crystal, 6dB 1.7KHz-150Hz | 4-pole crystal |
| AGC | audio derived | (overcurrent limited) | no | yes |
| IF | 11 MHz (40m) | 4 MHz (40m) | 5 MHz (40m) | 2 MHz (40m) |
| Audio | 300mW 4ohm, 3"spkr | headphone only | can drive 5" spkr, 2 pole active filter opt. | |
| Kit w/ Enclosure | $95 | $130 incl. AF-1 filter (disc. $114) | $129 (disc. $122.50) | |
| Board/Parts | $55 (disc. $50) | $80 | ||
| Encl/Hdwr | $35 (custom TenTec) | $35 | ||
| Hours to build | ||||
| Number of parts | board=156, filter=17 | |||
| Difficulty | ||||
| Other | Add'l tech info from QRPp, Elmer 101 course, Manual w/ info for beginners, Nov94 QST, CW freq counter optional ($20), rev- polarity diodes, pre- assmbld harness | digital readout avail. | Opt.KC1/KC2 freq counter//disp keyer, pwr meter; stable down to 9.5v | |
| Comments from other builders | quality | Lighter than Emtech or TenTec, QRPp manual great | quality, stable vfo, superb, may not be best for 1st kit (x2) | Used in CalTech EE20 class, good manual, super, neat looking, great operating, class notes give theory, stable vfo (x2), board mtd cntrls speed up building, good beginner kit |
| TenTec | SW+ | NWxx+ | NorCal 40a |
Items w/ asterisk for SW+ are from specs for 40-40 predecessor per Nov '94 QST article