Coil companies, in general, avoid talking about temperature coefficient (TC), since it is not easily controllable over a production run. In addition, this parameter is difficult to measure with any degree of accuracy.
At Coil-Q, we not only measure this parameter, but we guarantee it to be less than 30 PPM/°C for the Q2 version and under 35 PPM/°C for the minature Q3 type.
High Q Coils for VHF-UHF
Notes - Q and inductance were measured on a Boonton 190A Q meter. Inductance is net, i.e. parasitics were subtracted from readings. Q was obtained by the use of soldered lead extensions to the terminals.
High Q Coils for HF
Notes - The inductance adjustment range of Q3 type coils was deliberately stated below the attainable values by mechanically adjusting capability, in order to keep Q variations below 7%. Of course a larger adjustment range is possible if Q variation is not of great importance to the circuit.
Inductance and Q of the HF coils were measured on the HP 4323A Q meter. Data was obtained by the use of soldered leads, in order to avoid errors due to contact resistance.
Please note that the VHF-UHF coil inductance is indicated in nanohenires. The HF portion of the listing is stated in microhenries.
The Q3SMT Series inductors are available in the standard .445in high, (tuneable +/- 10%), or the flat top .42in high, (tuneable +/- 7%).
Please specify the package height when ordering.
Materials
- Pins are tin plated.
- Coil base is made of temperature resistand DAP.
- Coil form is made of gloss woven polyester.
- The core structure of the coil consists of cup core and a threaded center core which combine to give good magnetic shield.
- Both core elements are made of powdered iron, to minimize performance variation with temperature.
- Electrostatic shield consists of a copper can, tin plated.