Measured parasitic suppressor data

Data measured by Wes Stewart, N7WS. Sample materials provided by Rich Measures, AG6K, and Tom Rauch, W8JI.

The data for the parasitic suppressor measurements has the following format:

Column 1 is the test frequency in MHz.
Column 2 is the measured effective (series) inductance. For the samples tested, a bit of calculating shows that the distributed capacitances are approximately 2 pf. This explains the rise in inductance with increasing frequency (unloaded samples only).
Column 3 is the measured Q.
Column 4 is the measured equivalent series resistance.
Column 5 is the measured effective (parallel) inductance.
Column 6 is the measured shunt conductance in milli-siemens.
Column 7 is the computed parallel resistance.
All data were taken using a Hewlett-Packard Model 4191A RF Impedance Analyzer. An open-short-load cal procedure was performed using coaxial standards. Following calibration, a binding post adapter was used, with appropriate electrical port extension.
Lead lengths and orientation for the various samples were approximately equal. The W8JI sample (as used in the AL-80B) was received assembled and was slightly larger and the lead lengths were also longer.
The W8JI suppressor resistor DC resistance was measured after completion of the RF tests and was found to be 109 ohm (100 ohm marked).
All nichrome inductors were approximately 4.5 turns formed on a 1/4" diameter mandrel. Turn spacing was adjusted for a target inductance between 90 and 110 nh at 10 MHz.

**Measured Data**
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample

10	112.4	19.7	N/R	112.6	7.10	140.85	W8JI w/109 ohm shunt R
20	111.9	11.4	N/R	112.7	6.20	161.29	W8JI w/109 ohm shunt R
30	111.3	7.8	N/R	113.1	6.00	166.67	W8JI w/109 ohm shunt R
50	109.8	4.7	N/R	114.8	5.90	169.49	W8JI w/109 ohm shunt R
100	101.8	2.2	N/R	128.7	6.00	166.67	W8JI w/109 ohm shunt R
120	96.3	1.7	N/R	139.3	6.00	166.67	W8JI w/109 ohm shunt R
150	85.5	1.3	N/R	167.2	6.10	163.93	W8JI w/109 ohm shunt R
200	62.5	0.8	N/R	N/R	5.90	169.49	W8JI w/109 ohm shunt R
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample
10	113.0	15.1	0.47	113.6	9.30	107.53	NiCh 60 No shunt R
20	111.6	21.8	0.64	111.9	3.26	306.75	NiCh 60 No shunt R
30	111.3	26.7	0.79	111.4	1.78	561.80	NiCh 60 No shunt R
50	112.1	33.8	1.04	112.2	0.84	1193.32	NiCh 60 No shunt R
100	119.5	43.3	1.73	119.5	0.31	3246.75	NiCh 60 No shunt R
120	124.7	45.7	2.06	124.8	0.23	4310.34	NiCh 60 No shunt R
150	135.8	47.5	2.70	135.9	0.16	6097.56	NiCh 60 No shunt R
200	168.7	45.0	4.70	168.8	0.11	9523.81	NiCh 60 No shunt R
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample
10	106.4	7.6	0.88	108.0	19.40	51.55	NiCh 60 w/100 ohm shunt
20	103.2	5.8	2.25	106.3	13.00	76.92	NiCh 60 w/100 ohm shunt
30	100.6	4.4	4.32	105.8	11.41	87.64	NiCh 60 w/100 ohm shunt
50	94.8	2.9	10.33	106.2	10.40	96.15	NiCh 60 w/100 ohm shunt
100	75.7	1.5	32.85	111.8	9.83	101.73	NiCh 60 w/100 ohm shunt
120	67.2	1.2	43.1	115.7	9.75	102.56	NiCh 60 w/100 ohm shunt
150	54.4	0.9	58	123.9	9.69	103.20	NiCh 60 w/100 ohm shunt
200	35.3	0.6	78.7	146.6	9.64	103.73	NiCh 60 w/100 ohm shunt
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample
10	95.3	15.5	N/R	95.6	10.70	93.46	Pure NiCh No shunt R
20	93.9	22.3	N/R	94.1	3.80	263.16	Pure NiCh No shunt R
30	93.6	27.3	N/R	93.7	2.07	483.09	Pure NiCh No shunt R
50	94.0	34.7	N/R	94.1	0.98	1020.41	Pure NiCh No shunt R
100	99.0	45.3	N/R	99.0	0.36	2816.90	Pure NiCh No shunt R
120	102.5	48.1	N/R	102.6	0.27	3731.34	Pure NiCh No shunt R
150	109.9	50.6	N/R	109.9	0.19	5235.60	Pure NiCh No shunt R
200	130.2	51.0	N/R	130.3	0.12	8333.33	Pure NiCh No shunt R
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample
10	92.6	8.3	0.70	93.9	20.30	49.26	Pure NiCh w/100 ohm shunt
20	90.3	6.5	1.75	92.4	13.30	75.19	Pure NiCh w/100 ohm shunt
30	88.4	5.0	3.34	92.0	11.60	86.21	Pure NiCh w/100 ohm shunt
50	84.4	3.3	8.00	92.1	10.50	95.24	Pure NiCh w/100 ohm shunt
100	71.0	1.7	26.44	96.0	9.82	101.83	Pure NiCh w/100 ohm shunt
120	64.7	1.4	35.30	98.7	9.73	102.77	Pure NiCh w/100 ohm shunt
150	54.9	1.1	49.10	104.3	9.65	103.63	Pure NiCh w/100 ohm shunt
200	38.9	0.7	70.10	118.8	9.58	104.38	Pure NiCh w/100 ohm shunt
FREQ (MHz)	Ls (nH)	Q	ESR	Lp (nH)	G (mS)	Rp (ohm)	Test Sample
10	105.7	102	N/R	105.7	1.5	666.67	Tinned copper wire 18 AWG
20	105.7	140	N/R	105.7	0.53	1886.79	Tinned copper wire 18 AWG
30	106.1	160	N/R	106.1	0.31	3225.81	Tinned copper wire 18 AWG
50	107.5	182	N/R	107.5	0.163	6134.97	Tinned copper wire 18 AWG
100	115.7	200	N/R	115.7	0.069	14492.75	Tinned copper wire 18 AWG
120	121.3	210	N/R	121.3	0.052	19230.77	Tinned copper wire 18 AWG
150	133.0	220	N/R	133.0	0.037	27027.03	Tinned copper wire 18 AWG
200	168.1	210	N/R	168.1	0.023	43478.26	Tinned copper wire 18 AWG

View the data in graphical form

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