Downstairs (IF2) HP3488 bits for digital output

04dec05

The hp3488 is a digital output box that connects to the computer via gpib. There are two boxes: one that connects to the polA iflo and a second that connects to the polB iflo. Each box has 5 digital output cards and each card holds 16 bits (80 bits in total). Normally cards are configured for output only. The table below shows the bits currently in use.
key:

name: name of this switch
card: hp3488 card. numbered 1 through 5
1stBit: for this device (count from 0) on this card
lastBit: for this device (count from 0) on this card
Pols: a,b or ab. Most bits are the same in the polA and polB hp3488 box. These are marked ab. Some bits are only used in the polA (a) or polB(b) box. They go to things that are not duplicated in the two polarization chassis (e.g. cal source ).
Schem: The reference number on the schematic (see schematic pdf file). There are 3 pdf files that hold the if2 schematic. They are ordered by reference number:

ref numbers 1-6 : page 1 of 3 polA (.pdf)
ref numbers 7-8 : page 2 of 3 polB (.pdf)
ref numbers 9-12 : page 3 of 3 260 to 30 mhz converter (.pdf).

Coding: How the bits are interpreted. This is in binary with the n bits interpreted as a number (the leftmost digit is the last bit, the rightmost digit is the 1stbit)
Description: What these bits are used for.

**IF2 HP3488 TABLE (last updated 01dec05)**
name	card	1stbit	lastbit	pols	schem	coding	description
pre amp	1	0	2	ab	3	111 no gain 110 10db gain 100 20db gain 000 30db gain	3 10b amps at top of if2. When the bit is 0 the amp is inserted.
pre attn	1	3	6	ab	3	b0 1db 0 in,1 out b1 2db 0 in, 1 out b3 4db 0 in , 1 out b4 4db 0 in , 1 out	11 db attenuators at input to if2. there are 4 attenuators 1,2,4, and 4 db each that are switched in / out by a single bit (0 --> in).
if Input (sw141)	1	7	11	ab	4	11110 :1500 11101 : 750 11011 : 300 10111 : 750narBand 01111 : alfa	selects the input path thru the iflo

mix1inp	2	0	1	ab	5,6	00 : 1250 01 : 1500 10 : 1750 11 : 750	Selects the source input to the mixer
mix2inp	2	2	3	ab	5,6	see mix1inp	Selects the source input to the mixer
mix3inp	2	4	5	ab	5,6	see mix1inp	Selects the source input to the mixer
mix4inp	2	6	7	ab	5,6	see mix1inp	Selects the source input to the mixer
mix5inp	2	8	9	ab	5,6	see mix1inp	Selects the source input to the mixer
mix6inp	2	10	11	ab	5,6	see mix1inp	Selects the source input to the mixer
mix7inp	2	12	13	ab	5,6	see mix1inp	Selects the source input to the mixer
mix8inp	2	14	15	ab	5,6	see mix1inp	Selects the source input to the mixer

syn1 dest	5	0	1	a	8	00 : front panel 01 : 260->30 mixer 10 : vlba 11 : if2 mixers	set the output destination for the synthesizers.
syn2 dest	5	2	3	a	8	same as syn1 dest
syn3 dest	5	4	5	a	8	same as syn1 dest
syn4 dest	5	6	7	a	8	same as syn1 dest
syn5 dest	5	8	9	a	8	same as syn1 dest
syn6 dest	5	10	11	a	8	same as syn1 dest
syn7 dest	5	12	13	a	8	same as syn1 dest
syn8 dest	5	14	15	a	8	same as syn1 dest

transfer switch	5	0	0	b	2	0 switched 1 unswitched	switches polA,polB IF at input to iflo. Unswitched is the normal straight through mode.
260to30 2or4pols	5	1	1	b	10	0 4a 0b 1 2a 2b	the 260 to 30 mhz down converter can output 2 channels pola, 2 channels polB or 4 channels polA (this is mainly used for the crr aeronomy experiments)
430blanking	5	2	2	b	10	0 no blanking 1 blanking	lets you blank the IF input to the 260 to 30 Mhz converter while the 430 transmitter pulse is on.
alfaamp	5	3	3	b		0 out(nofilter) 1 in (with filter)	switch alfa IF1 amplifiers for 1440 100 Mhz filter in or out.
cal source	5	4	6	b	12	0 : interim corr. 1 : 25 hz cal 2 : wapp 3 : unused 4 : cal on 5 : cal off 6 : front panel bnc 7 : front panel switch	Determines which ttl signal goes up to fire the cal. The 3 bits are decoded to a number 0 through 7. These values are 1 less than the numbers you input with the routine calport.
visitors 30Mhz	5	7	7	b	11	0 : from ch 1 : from dome	determines which 30 Mhz IF goes to the visitors equipment 30 Mhz (in the computer room).
signalSource	5	8	9	b	1	0 : ch 1 : dome 2 : noise source.	Chooses the input IF. ch is from the 30 to 260 Mhz upconverted. Dome is the fiber from the dome. Noise source is the one in the if2 racks.
blankers	5	10	11	b		11 : faa 10 : iridium (N) 01 : iridium (M) 00: extra	control which blanking signal goes to the backends. N is normal iridium blanking (50 %duty cycle) M has a larger blanking duty cycle.

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