Band1a 6m Introduction


The latest design of the HF-BPF kit now permits of two options:

These builders notes describe 4 "bands" and the board layout permits filters for four bands. However, depending upon the option (1 or 2), the bands named "band 1" and "band 2" will be built and installed differently. The changes for Band 1 are as follows (and will be implmented somewhat more elegantly in these note, time and resources permitting):

See the detailed techniques for winding toroidial coils

(go directly to build notes)

Band1a 6m Schematic

(Resistor testpoints (hairpin, top, or left-hand lead), as physically installed on the board, are marked in the schematic with red dots)

(Click for Full Schematic)
Band1a 6mschematic (go directly to build notes)

Band1a 6m Bill of Materials

Stage Bill of Materials

(resistor images and color codes courtesy of WIlfried, DL5SWB's R-Color Code program)

C075.6 pF 5%5.6Ceramic  Band1a 6m
L11.64 uH 23T #30 on T25-6 (15")yellow yellowCoil  Band1a 6m
C095.6 pF 5%5.6Ceramic  Band1a 6m
L31.64 uH 23T #30 on T25-6 (15")yellow yellowCoil  Band1a 6m
L2unused capacitorUnused  Band1a 6m
C0839pF 5%39JCeramic  Band1a 6m

Band1a 6m Summary Build Notes

Band1a 6m Detailed Build Notes

Top of the Board

Band1a 6m Top View

Install the Capacitors

C075.6 pF 5%5.6Ceramic 
C095.6 pF 5%5.6Ceramic 
C0839pF 5%39JCeramic 

Wind and Install the Coils

L11.64 uH 23T #30 on T25-6 (15")yellow yellowCoil 
L31.64 uH 23T #30 on T25-6 (15")yellow yellowCoil 
L2unused capacitorUnused 

Band1a 6m Completed Stage

Top of the Board

View of Completed Top

Band1a 6m Testing

Visual Inspection

Test Setup

Using very good lighting and magnification, carefully inspect the solder joints to identify bridges, cold joints, or poor contacts.

Pay especial attention to the joints on the inductors. If necessary, touch up the joints with your iron and/or some flux.

Continuity Tests

Test Setup

    • This tests for continuity in the "chain" of inductors for this band
    • The graphic below shows two continuity chains and their associated test points on the bottom of the board.
    • The "A and B chains"are shown using lettered dots and lines. :
    • For each of the two segments (A-A and B-B), measure the resistance between the dot pairs - you want ~0 ohms.
    Continuity Tests

    Test Measurements

    TestpointUnitsNominal ValueAuthor'sYours
    Point "A" to poin "A"tohms0TBD_______
    Point "A" to poin "A"tohms0TBD_______