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Mini-Circuits TT1-6
The next 1:1 transformer tested is the TT1-6. The following table lists the results:
| FSA3157 + TT1-6 + 74AC04 |
Vdd = 7.0V, Vbias = 2.5V |
Best bias |
| Band |
BPF |
mixer |
MDS -dBm |
IF rej |
spur |
mixer IIP3 (dBm) @ 20KHz spacing |
Bias |
IIP3 |
| IL |
CL |
- |
+ |
|
avg |
-6 |
-3 |
0 |
+3 |
+5 |
|
0 |
| -dB |
-dB |
BPF |
BPF |
-dB |
dB |
dBm |
dBm |
dBm |
dBm |
dBm |
V |
dBm |
| 160 |
3,3 |
4,72 |
133,5 |
130,0 |
51,2 |
|
|
|
45,4 |
|
|
2,5 |
45,4 |
| 80 |
1,4 |
4,76 |
133,5 |
132,0 |
52,0 |
|
46,7 |
48,7 |
50,2 |
50,2 |
50,0 |
2,5 |
50,2 |
| 40 |
2,3 |
4,84 |
133,5 |
131,0 |
54,4 |
|
|
|
50,9 |
|
|
2,5 |
50,9 |
| 30 |
3,4 |
4,84 |
133,5 |
130,0 |
53,2 |
|
|
|
49,0 |
|
|
2,5 |
49,0 |
| 20 |
3,4 |
4,84 |
133,5 |
129,5 |
55,2 |
|
|
|
46,7 |
|
|
2,5 |
46,7 |
| 17 |
3,0 |
4,96 |
133,5 |
129,0 |
75,2 |
|
|
|
45,1 |
|
|
2,5 |
45,1 |
| 15 |
3,9 |
5,00 |
133,5 |
128,5 |
61,6 |
2,6 |
|
|
42,6 |
|
|
2,5 |
42,6 |
| 12 |
3,7 |
5,04 |
133,0 |
128,5 |
46,5 |
|
|
|
42,1 |
|
|
2,5 |
42,1 |
| 10 |
2,3 |
5,20 |
133,0 |
130,0 |
37,6 |
|
|
|
44,3 |
|
|
2,5 |
44,3 |
| 6 |
|
5,20 |
131,0 |
|
48,0 |
|
|
|
41,7 |
|
|
2,5 |
41,7 |
| 4 |
|
5,80 |
122,0 |
|
26,8 |
|
|
|
36,4 |
|
|
2,5 |
36,4 |
Conversion loss is good, below -5,2dB on HF but steadily worsening on higher frequencies, much like ADTT1-6.
Average spur level with the TT1-6 is rather poor at 2,6dB. Note that this applies to a mixer adjusted for best RF-IF isolation, so nothing special was done to minimize the spur level. No good spur reduction was found with the mark/space adjustment. Although some individual spurs could be reduced, no setting was found that reduced many at the same time.
RF-IF isolation is excellent, better than -60dB, if band specific adjustments are made. The levels in the table are for the best isolation on 15M.
The TT1-6 combination has the best average bias point at 2.5V. No steep dips on any band though. This configuration is almost completely bias point independent.
This mixer configuration behaves very well with regard to IP3's 3rd order law. The IP3 is completely flat over a wide input range on 80M!
The TT1-6 mixer combination is the second to exhibit >+40dBm IP3 on all HF bands including 6M.
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