Q&ATechnical Testing Report

Q1 : What’s the difference among 7H.7S.5W.5R Series?

Case name Tuning Pole Case size
H x W (mm)
Terminator Freq. Region Input power
7H series 2-5 Pole 12.5 x 7.6 Pin type 42~1500MHz >1 watts
7H series 2-4 Pole 7.7 x 7.6 Pin type 196~1500MHz >1 watts
7H series 2-4 Pole 8.6 x 5.6 Pin type 230~2600MHz >1 watts
7H series 2-4 Pole 8.6 x 5.6 Pin type 230~1650MHz >1 watts

Q2 : What’s the difference among 7H2.7H3.7H4.7H5 ?

Differences \ Item 7H2 (TD) 7H3 (TT) 7H4 (TF) 7H5 (TV)
In the Dimension Double-tuned Triple-tuned Quadruple-tuned Quintuple-tuned
In the Performance Each Series adding one pole itself will increase attenuation and offer much better
performance. Also, it’ll increase Insertion Loss 10~30% from the original one.

Q3 : How to choose a Part Number from Temwell Standard Product List?

Please follow the below steps:

1.Decide Center Frequency you need, searching it from ‘’Acceptable Specify Fo Range’’ (designed by Temwell), then you can minimize the area and focus on some specific Parts Numbers.

2.Decide Center Frequency you need, searching it from ‘’Acceptable Specify Fo Range’’ (designed by Temwell), then you can minimize the area and focus on some specific Parts Numbers.

3.Click onto each Part Number in the data-sheet, see the Performance curve and detail Spec.

4.Find out the best Performance Curve that close your request in each Data-sheet.

5.Choosing the Part Number that have the closest spec to you.

6.If the Sample Fo of your selective Part Number doesn’t completely meet your requests, please ask us to make the custom item as your need, providing us Center Fo, BW, IL, etc in the same time.

Q4 : What do you mean by ‘’Acceptable Specify Fo Range’’ showing on each Spec.?

That means we can make the same performance curve shift as the Frequency range that we set in the acceptable specify Fo Range. For example, Part Number:TT6755D-145M, Acceptable Specify Fo Range:125~145 MHz, customer need Fo=127 MHz, It’s because Fo=127M during the range 125~145Mhz so that the specification and performance curve of TT6755D can be tuned by Temwell to 127MHz as good as the original Fo. The Part No. would be transferred to TT6755D-127M .

Q5 : What do you mean by ‘’Tunable Range’’ showing on each spec., can I tune by myself?

1.Tunable Range +/-10 MHz means you can tune by yourself, in this case, performance will not move so much, however, only when you need to make some necessary modification to adjust your equipment,please noted you should have instrument such as network analyzer, then tuning the Fo about +/-10 MHz is acceptable. (※Please noted we are not responsible for the tuning damage caused by customer)

2.7H4 Series (TF) and 7H5(TV) are not allowed to tune by customers themselves.

Q6 : In what situation should I do some ‘’Tuning’’ by myself?

In some particular cases, it is very important to tune by yourself. If match circuit don’t complete (in or out ),with RF Circuit. So that Fo (Center Freq.) would be moved in a several MHz from Fo. At this moment, you can tune the screw very carefully , let Fo return to original Fo that you design at the beginning.

Q7 : What do you mean by ‘’Bandwidth’’?

The width of the pass band of a Band Pass Filter is the frequency difference between lower and upper 3 dB points, Generally ,
show at –3db,sometimes,at –1db it described the same spec of curve at different mark point .

Q8 : What should I note if I will adjust the screw by myself?

When you want to tune the screw. Each screw moves the same distance and see the Band Pass figures by NA. If someone is overturning and lose the function, please be responsible for the unworking BandPass Filter.

Q9 : Low pass, high pass, and band pass?

Low pass and high pass are not available. We only provide BAND PASS FILTER, which means a filter that passes one band of frequency and rejects both higher and lower frequencies.

Q10 : Where is the different between RF Connector Filter and RF Band Pass Filter?

It’s different between RF Connector filter and RF Helical Band Pass Filter because the RF Connector filter have combined the RF Helical Filter(7H3 and 5W3 Pin Type Series) with the PC board with the connector,
including SMA,F,N, and we have already adjusted the efficiency. If you are not sure to use the Helical Filter into the PC board ,we would recommend you purchasing the RF Connector filter ,which can be used by locking the connector .