Frequency Counters I have

Manufacturer

Model

S/N

Bandwidth

Performance (MHz@dBm)

int Accuracy [1]

Functional?

Have manuals?

Have A/C?

Have the battery?

Date acquired

Cost me

Source

Connectivity

Status

Comments

(China)

PLJ8LEDH

0-2.4GHz?

8 digits, tweaked.

Yes

Online

N/A

2025-06-18

$0.50

West Valley fleamarket

BNC, possible serial

Functional

In black plastic case with BNC below

homebrew INTERSIL

handmade 7216B

1?

0-150MHz

not tested, but I can tell it is not great

xtal, TCXO

Recovering from making it a tester for HP Classic calc displays

none, ICM datasheet

wall wart

internal NiCd

2024-01-02

$20

Anchor Electronics door special

BNC

low senitivity, internal noise

3" square cast Al box, dead-bug+socket, 2x5082-7415 display

??

E0330

??

0-50MHz

not tested

yes

online

wall wart

N/A

2015-04-??

$15

ebay, china

ZIF

flakey

5-digit counter for xtals

Agilent

53131A

??

0-225MHz

225@-18 301@0

yes

online

IEC

N/A

2016-10-19

$245, $30 handle+bumpers

ebay

BNCs, GPIB, RS-232

on cart

totalize, 12 dig(10/s), GPIB, serial

Extech

380282

??

0-1MHz

1.5@0

yes

pamphlet

N/A

9V

2016-05-14

$60

De Anza

banana, serial

daily DMM

DMM w/1MHz counter, square-wave source

Fluke

1900A

??

0.000005-80MHz

Not yet testable

barely

online

IEC

N/A

2025-04-06

$30.00

West Valley flea

BNC

HeathKit

IB-1103

??

0-180MHz

not tested

TCXO 999999.98169 Hz Mean, on extender

recovering

online

weird

N/A

2017-04-07

$55

TESLA (!)

BNC

ext ref, needs repair on input board

Nixies! TCXO!

HP

5315B

2538A03741

0-100MHz

170@-20 170@0

TCXO 9999999.923671428 Hz mean

yes

online

IEC

N/A

2015-04-??

$30

De Anza

BNCs

on shelf

ext ref switch inside. custom TCXO

HP

5316B

2708A00981

0-100MHz

101@-20 171@0

XO 9999999.923966667 Hz mean. Varies 20/mHz in a few minutes. could fit TCXO I made for 5315B

yes

online

IEC

N/A

2019-04-13

$50

flea @ Fry's

BNCs, GPIB, testpoints

Tweaked stock XO, not option 001.

difficult GPIB. same depth as 16A? Bail feet

Racal

9915

??

0-520MHz

60/520 60@-40 75@0 78@10 520@-28 720@0

OCXO 1000000.0000861111 Hz mean tweaked. Gains 20mHz/day, smallest tweak gets that. hysteresis. Much better with 1MHz ublox as ref on 53131A vs Tbolt

was wired for 240V

not yet

IEC

internal, deadish

2017-05-13

$2

De Anza

BNCs, testpoint

rewired for 125V. many screws frozen. still needs cosmetic reconstruction.

live count in burst mode, has prescaler _and_ multiplier, and OCXO, and AGC out?

Sabtronics

8100

??

0-100MHz

100@-17 147@0 160@13

Sweet spot appears to be 3.5795400MHz. That's embossed on the xtal. Probe capacitance accounts for 500mHz. drifts anyway

wasn't

online

wall wart

holders not connected

2017-08-12

$5

De Anza

BNCs

replaced 75492, 2x FND357

almost colorburst reference frequency

Systron-Donner

6150

??

0-50MHz

67MHz, 71@5

yes

not yet

IEC

N/A

2017-05-13

$60

De Anza

BNCs, combs

Nixies! 8- and 9-digit optional. 2U rack mount. crystal?

one of those counters that live-counts for a while, stops to display, then starts over

Tektronix

CDC250

??

0-175MHz

212@0, 213@3

TCXO

yes

online

IEC

N/A

2014?

$125?

HSC

BNCs

loose BNC brought price down a little

TCXO, totalize, ext ref

Tektronix

CFG280

??

0-11MHz

89@-20 131@0 132@15

1MHz de GPSDO showed 1.000002 MHz.

yes

online

IEC

N/A

2014?

$110?

ebay

BNCs

can get about 7D resolution from 5D counter

swept function generator, modulation inputs

Tektronix

CMC250

??

0-100MHz,80M-1.36GHz

1MHz GPSDO reads 999.9975 at 10 sec; 990.0000MHz reads 989.99700 at 27 sec

2x trimmed XO.

yes

online

IEC

N/A

2024-08-11

$25

West Valley Flea

BNCs

timebase hard to tweak; inward pressure on trimmer drops about 250Hz. reflowed trimmer with little effect.

no TCXO, totalize, no ref

Tektronix

2715

??

0.009-1800MHz

not tested

mostly

online

IEC

N/A

2016-05-13

$260

ebay

75R F, RS-232

on cart

1Hz counter for tuned signal is broken

Tektronix

DMM916

??

0-4MHz

not tested

counter works

yes

N/A

9V

1990?

$300?

Fry's

banana

shelved

Flakey DMM w/4MHz counter

Manufacturer

Model

S/N

Bandwidth

Performance (MHz@dBm)

int Accuracy

Functional?

Have manuals?

Have A/C?

Have the battery?

Date acquired

Cost me

Source

Connectivity

Status

Comments

Fluke

1900A

??

0.000005-80MHz

108@0

yes

online

IEC

N/A

2018-04-06

$20

C&H, Duarte

BNC

Disposed at flea mkt 2018-09-08 Replaced 2025

GIFT OF/JOHN FLUKE/MAY 1986

HP

5316A

??

0-100MHz

100@-12 190@0 192@6

yes

online

IEC

N/A

2015-10-??

$40

ebay

BNCs, GPIB, testpoints

Sold flea market 2019-08-10

difficult GPIB, extref switch outside.