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Synergy TW-2A2
Thanks to Stuart Mulhall from Air-Parts, the Dutch distributor of Synergy Microwave Corporation I have been able to obtain 3 samples of the TW-2A2 1:1 wideband transformer. This transformer is quite similar in it specifications to Mini-Circuit T1-6T. After having tested so many transformers from Mini-Circuits it is interesting to see how 1:1 transformers from a different manufacturer behave in the H-Mode circuit. The following table lists the results:
| FSA3157 + TW-2A2 + 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 |
4,92 |
133,0 |
129,0 |
76,4 |
|
|
|
47,4 |
|
|
2,5 |
47,4 |
| 80 |
1,4 |
4,80 |
133,0 |
131,0 |
86,2 |
|
44,7 |
46,5 |
48,0 |
48,0 |
49,0 |
2,5 |
48,0 |
| 40 |
2,3 |
5,00 |
133,0 |
130,0 |
66,0 |
|
|
|
50,2 |
|
|
2,5 |
50,2 |
| 30 |
3,4 |
5,00 |
133,0 |
129,0 |
65,0 |
|
|
|
48,3 |
|
|
2,5 |
48,3 |
| 20 |
3,4 |
5,24 |
133,0 |
129,0 |
63,6 |
|
|
|
44,4 |
|
|
2,5 |
44,4 |
| 17 |
3,0 |
5,32 |
133,0 |
129,0 |
58,4 |
|
|
|
44,1 |
|
|
2,5 |
44,1 |
| 15 |
3,9 |
5,20 |
133,0 |
128,0 |
56,0 |
7,8 |
|
|
43,1 |
|
|
2,5 |
43,1 |
| 12 |
3,7 |
5,40 |
133,0 |
128,0 |
56,8 |
|
|
|
45,3 |
|
|
2,5 |
45,3 |
| 10 |
2,3 |
5,44 |
133,0 |
130,0 |
66,8 |
|
|
|
44,3 |
|
|
2,5 |
44,3 |
| 6 |
|
5,40 |
132,0 |
|
53,2 |
|
|
|
40,5 |
|
|
2,5 |
40,5 |
| 4 |
|
6,28 |
127,0 |
|
55,6 |
|
|
|
39,4 |
|
|
2,5 |
39,4 |
Conversion loss is excellent, around -5dB on HF but steadily worsening on higher frequencies, much like T1-6T.
Average spur level with the TW-2A2 is rather poor at 7,8dB. Note that this applies to a mixer adjusted for best RF-IF isolation, so nothing special was done to minimize the spur level.
RF-IF isolation is excellent, better than -53dB, if band specific adjustments are made. On 80M an amazing nullout of -86dB was possible.
The TW-2A2 is almost completely insensitive to the mixers bias point. A value of 2.5V gave excellent results on all bands.
This mixer configuration behaves very well with regard to IP3's 3rd order law. The IP3 is very flat over a wide input range on 80M!
The TW-2A2 mixer combination is the fourth to exhibit >+40dBm IP3 on all HF bands including 6M and almost 4M!
Synergy's TW-2A2 comes very close to the performance T1-6T. It is very similar. The spur map on 15M also had much similarity to the T1-6T observed spurs. For those who have easy access to Synergy products this transformer is certainly a good alternative to T1-6T.
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