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FILTER SOLUTION EXPERT
AND CONSULTANT

Customized RF Components and Microwave

2019-09-27

Amateur radio frequency allocation is done by national telecommunication authorities and oversees by the International Telecommunication Union (ITU). Individual amateur stations are free to use any frequency within authorized frequency ranges. The authorized bands may vary by the class of the station license.

Frequencies above 30 MHz are referred to as Very High Frequency (VHF) region and those above 300 MHz are called Ultra High Frequency (UHF). The allocated bands for amateurs are many megahertz wide, allowing for high-fidelity audio transmission modes (FM) and very fast data transmission modes.

VHF and UHF amateur radio frequency allocation:
6 meters amateur radio band: 50 MHz - 54 MHz
4 meters amateur radio band: 70 MHz - 70.5 MHz
2 meters amateur radio band: 144 MHz - 148 MHz
1.25 meters amateur radio band: 219 MHz - 220 MHz (Canada only), 222 MHz - 225 MHz (US & Canada)
70 centimeters amateur radio band: 420 MHz - 450 MHz
33 centimeters amateur radio band: 902 MHz - 928 MHz
23 centimeters amateur radio band: 1240 MHz - 1300 MHz
13 centimeters amateur radio band: 2300 MHz - 2310 MHz (lower segment), 2390 MHz - 2450 MHz (upper segment)

Temwell designs, manufactures and markets RF & Microwave solution for a wide variety of applications. We special released standard VHF and UHF band pass filters to meet amateur radio, self-training, DIY and hobbyist needs. The helical band pass filters have excellent noise interference suppression which can eliminate noise and do not affect the quality of communication. Our existing amateur radio bands included 146 MHz, 232.5 MHz, 435 MHz, 915 MHz, 1270 MHz, 1282.5 MHz, etc. Each frequency we offer at least 3 different specifications for you to choose. All models are available from stock. Welcome to visit our Shopline Store to check and take your prefer filter.

proimages/application/standard_ham/FILTER-ham.jpg proimages/application/standard_ham/TM-ham.jpg

We are also desired to build new standard series for Ham radio user in European area, Australia area, South Africa area, South America area, etc. Welcome to contact us for more detail discussion.

A. Frequency: 146MHz Spec (Freq / BW) Size (LxWxH)   Accepted Type
TD67281A-146M 146MHz / 8MHz TD (15.2x7.6x12.5) Pin Type / Module Type
TT67709B-146M 146MHz / 5MHz TT (22.8x7.6x12.5) Pin Type / Module Type

B. Frequency: 223.5MHz Spec (Freq / BW) Size (LxWxH) Accepted Type
TD6734B-223.5M 223.5MHz / 8MHz TD (15.2x7.6x12.5) Pin Type / Module Type
TT6762B-223.5M 223.5MHz / 9MHz TT (22.8x7.6x12.5) Pin Type / Module Type

C. Frequency: 435MHz Spec (Freq / BW) Size (LxWxH)  Accepted Type
TD67410B-435M 435MHz / 31MHz TD (15.2x7.6x12.5) Pin Type / Module Type
TT67295B-435M 435MHz / 35MHz TT (22.8x7.6x12.5) Pin Type / Module Type
TDW2630B-435M 435MHz / 33MHz TDW (11.2x5.6x8.6) Pin Type / Module Type
TTW3630B-435M 435MHz / 33MHz TTW (16.8x5.6x8.6) Pin Type / Module Type
D. Frequency: 915MHz Spec (Freq / BW) Size (LxWxH)  Accepted Type
TD67748B-915M 915MHz / 26MHz TD (15.2x7.6x12.5) Pin Type / Module Type
TT67550E-915M 915MHz / 27MHz TT (22.8x7.6x12.5) Pin Type / Module Type
TDW2553B-915M 915MHz / 29MHz TDW (11.2x5.6x8.6) Pin Type / Module Type
TTW3684B-915M 915MHz / 25MHz TTW (16.8x5.6x8.6) Pin Type / Module Type

E. Frequency: 1270MHz Spec (Freq / BW) Size (LxWxH)  AcceptedType
TT67810B-1270M 1270MHz / 60MHz TT (22.8x7.6x12.5) Pin Type / Module Type
TTW3759B-1275M 1270MHz / 65MHz TTW (16.8x5.6x8.6) Pin Type / Module Type

F. Frequency: 1282.5MHz Spec (Freq / BW) Size (LxWxH)  Accepted Type
TD67751B-1282.5M 1282.5MHz / 27MHz TD (15.2x7.6x12.5) Pin Type / Module Type
TT67426D-1282.5M 1282.5MHz / 25MHz TT (22.8x7.6x12.5) Pin Type / Module Type
TDW2575B-1282.5M 1282.5MHz / 29MHz TDW (11.2x5.6x8.6) Pin Type / Module Type
TTW3554B-1282.5M 1282.5MHz / 24MHz TTW (16.8x5.6x8.6) Pin Type / Module Type

We build over hundreds of standard helical band pass filter on Shopline Store. Filters are ready-made, could be delivered within 72 hours. it is readily hand solderable, pin type, power 5 watts, acceptable fine-tune the frequency and no minimum order quantity. For small quantity requirement, Temwell Shopline Store is the best and cost effective selection. Click Temwell Filter Store to see details.

If your amateur radio apparatus is affected by interference, Temwell’s inexpensive filter can help. We have 26 years of experience in designing and producing helical band pass filters.

Temwell helical band pass filters features:
Center frequency range 42 MHz – 2600 MHz
-3dB bandwidth: 5 MHz – 200 MHz
Impedance: 50 ohm & 75 ohm
Low insertion loss
High attenuation
minimum 12dB return loss
Frequency tunable
Power 5 Watts
Short lead time