The definitive word on Drake interface cables:
To quote K4OAH - still with us in many ways....
All original cables were 38" long tip-to-tip.
The INJ, (and CAR OSC in the C-Line,) cables used a foam inner dielectric and
phono connectors
with a white insulation. This cable measures 60 pF total capacity.
All other cables used the standard for the day clear polyethelene inner
dielectric and phenolic
(brown) insulated phono connectors and measure ~100 pF.
Original Drake INJ & CAR OSC Cables ?? 19
pF/ft?????????? 0.160" o.d. (foam
poly)
RG-62 ??????????? ??????????????????????? 93R???????????????? 13.5
pF/ft??????? 0.240" o.d.
RG-59???????????? ?????????????????????? 75R???????????????? 14.8
pF/ft??????? 0.242" o.d.
RG-6 ????????????????????????????????????? 75R???????????????? 16.2 pF/ft??????? 0.270" o.d.
RG-174????????????????????????????????? 50R???????????????? 30.8 pF/ft??????? 0.110" o.d.
Mic Cable (Belden 8410)???? Hi-Z???????????????? 33 pf/ft??????????? 0.160" o.d. (foam poly)
Mic Cable (Belden 8421)???? Hi-Z???????????????? 16 pf/ft??????????? 0.180" o.d. (foam poly)
R/S Audio Patch Cable??????????????????????????????? 28
pF/ft?????????? 0.165" o.d. (poly)
The best choice is the Belden 8421 Audio cable from their
"Brilliance" line. It looks just like
the other cables, and is very flexible. K0UYA, another list member, had some
8421 at one time
that he was selling by the foot. The RG-62 is OK, but it is 50% larger and far
less flexible.
RG-62 is also prone to shorting if bent over too small a radius, and is
susceptible to heat
damage when soldering connectors. The best "feature" of RG-62 is that
it is often FREE, since
there have been many miles of it pulled out of old computer networks.
The only pertinent factor is the total capacity. Impedance and "loss"
are not important.
Any _reasonably low capacity_ coax will work if the units are cabled together
for the
adjustment of the INJ trimmers.
The cable type ONLY affects the LEVEL of the PreMix signal, (5.645 MHz ABOVE
the
transmit/receive frequency,) and a small DC control voltage between the two. If
the shunt
capacity is too high, insufficient LO level for the first mixer will reduce the
sensitivity of
the receiver and the output power of the transmitter.
Some of the "commercial" cable mfrs use RG-59A, but it's a little larger
and also prone to
shorting if bent over too tight a radius.
The ANT lead to the receiver is too short to matter, but you want good shield
integrity, which
usually eliminates R/S cables.
The best connectors I've found are the Switchcraft 3502 plugs, available from
just about anyone,
Digikey, Mouser, Allied, Newark and just about any reputable parts place.
6-32 bolts thread into the same holes as the feet for the AC-4.
73, Garey - K4OAH
Rome, GA
Regards, - Steve? W7SJT "Always look for a positive solution then Improvise, Adapt, and Overcome" - Adaptation of the U.S. Marine Corps motto
"There are no rules here!...We're trying to accomplish something!!"
- Thomas Edison
"Success is not final, failure is not fatal.? It is the courage to continue that counts." -?Winston Churchill
?
On Thursday, March 30, 2023 at 11:33:25 AM MDT, Skip via groups.io <wb4yvo@...> wrote:
Just measured my cables? They are anywhere from 90 pf? to 271 pf? most are around 100-115 pf.? My question is for the inj and car osc cable what is the capacitance in a 3 foot run.. all my cables are about 3 foot take a few inches..
I guess you use RG-62 cable..? but I do not think any of mine are that..? At lease its not marked.
Skip
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Those are all high-capacitance.? You should have 60 pF, total.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Thursday, March 30th, 2023 at 1:33 PM, Skip via groups.io <wb4yvo@...> wrote:
Just measured my cables? They are anywhere from 90 pf? to 271 pf? most are around 100-115 pf.? My question is for the inj and car osc cable what is the capacitance in a 3 foot run.. all my cables are about 3 foot take a few inches..
I guess you use RG-62 cable..? but I do not think any of mine are that..? At lease its not marked.
Skip
|
Lyndon Nerenberg (VE7TFX/VE6BBM)
Joe Wolfe writes: I had a Heathkit SB102 in my 1962 Toyota Land Cruiser. Worked great! (My =
=E2=80=9962 had a column shift, so lots of room on the =E2=80=98hump=E2=80=
=99!) Not on the same scale as a TR8, but I had an early 80s Honda Civic hatchback with a stick and had no trouble mounting a Kenwood TS-680 and a generic 2m mobile rig under the dash and in front of the shifter. I forget the model of tuned stick antenna on the bumper, but that setup worked amazingly well for 20m mobile. I made endless Qs on 20 during many 13 hour road trips through the Rockies, travelling between Athabasca and Vancouver. I don't think I could have done it with a TR-4 -) But I'm willing to bet I could have squeezed the TR-5 in there. It would have been a bit on the wide side, so there might have been some knee-knocking activity. --lyndon
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Just measured my cables? They are anywhere from 90 pf? to 271 pf? most are around 100-115 pf.? My question is for the inj and car osc cable what is the capacitance in a 3 foot run.. all my cables are about 3 foot take a few inches..
I guess you use RG-62 cable..? but I do not think any of mine are that..? At lease its not marked.
Skip
|
Re: For Sale Beautiful 4A Line Sacramento, CA
I used to have my SBE SB-34 in my Sunbeam Tiger.? Plenty of room for both and plenty of power to compensate for the weight increase, hi hi.
I still have both but took the radio out.
73,
Gary
WB6OGD
?
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Re: For Sale Beautiful 4A Line Sacramento, CA
I had a Heathkit SB102 in my 1962 Toyota Land Cruiser.? Worked great!? (My ¡¯62 had a column shift, so lots of room on the ¡®hump¡¯!) ? Joe ¨C W7RKN ? From: [email protected] [mailto:[email protected]] On Behalf Of Steve Wedge, W1ES/4 via groups.io
Subject: Re: [DRAKE-RADIO] For Sale Beautiful 4A Line Sacramento, CA ? Not much room in the 2-seaters for something that large. I did, for a number of years, own Mazda Miatas and I had a Yaesu FT-90 dual-band UHF/VHF rig that fit in there perfectly.? Not too many larger rigs than that would have fit unless they had remote-capable installations.
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Re: For Sale Beautiful 4A Line Sacramento, CA
Not much room in the 2-seaters for something that large.
I did, for a number of years, own Mazda Miatas and I had a Yaesu FT-90 dual-band UHF/VHF rig that fit in there perfectly.? Not too many larger rigs than that would have fit unless they had remote-capable installations.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Thursday, March 30th, 2023 at 6:12 AM, Jim Altman <jaltman636@...> wrote:
I have always wanted to get a TR7 to put mobile in my 1980 Triumph TR8.
73, Jim W4UCK
|
On the heath? SB-221,? it too, also has the silly LP filter.? It also has only a 4 position bandswitch for both the kw tank output...and also the tuned input.? ?So no way to add 10m to it, unless you dumped the 15m position, and tapped it for 10m, then used correct values for a 10m tuned input.? ?When the filter is removed from the SB-221,? it screws up all the existing PI net tuned inputs.?
Most 11m ops would simply bypass the bandswitch for the output anyway, then just install a monoband 10m coil, directly between the tune and load caps.? Then modify the 15m tuned input for 11m. Then proceed to blow the amp up anyway...while using AM.? ?With amp tuned to say 1200 w pep out...and a 300 watt? UN-modulated cxr, the? Un modulated cxr eff is only 25%..and the anode diss is triple that, or 900 watts...and bye bye? 3-500Z's.? The fan in it is too small for 900 w CCS anode diss.?
The L4B / L7 isn't much better on AM.? ?The controlled cxr? AM scheme used on the 4 line drake rigs worked good on AM..and was compatible with the L4B / L7.?
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TR7/R7 Extender Boards and Puller
Hi to the group,
Wanted: TR/7R7 complete extender board set.
Thank you.
Chuck - AA5WG
Suttons Bay, Michigan
231-668-1115
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Re: For Sale Beautiful 4A Line Sacramento, CA
I have always wanted to get a TR7 to put mobile in my 1980 Triumph TR8.
73, Jim W4UCK
|
Re: How to re-tune a TR 4Cw
I¡¯d say that 100 kHz is definitely a time to retune.?
Normally, on 40, I¡¯d re-dip every 50 kHz, including the driver tuning.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Wed, Mar 29, 2023 at 10:13, Bill Turini via groups.io < Old.OpticalEngineer@...> wrote: How does one re-tune a TR4Cw when moving to a new frequency? ?
There are a lot of videos and documents on tuning a TR4Cw on a specific frequency, but I have not seen any instructions on how to touch up the tuning when going from say 7.160 MHz to 7.258 MHz. ?
I finally have my TR4Cw on-line and can tune it up on a frequency, but:?
* ? ?How do I tell when I've moved too far from the initial frequency and need to retune?
* ? ?How do I touch up the tuning? ?Certainly there has to be a better way than to start from scratch and tune up on the new frequency.
Thanks,
Bill
KA4GAV
|
Re: For Sale Beautiful 4A Line Sacramento, CA
HI Doug,
I just use my trusty (now old) iPhone 12 Mini.
A new software release automatically does the "photoshop" cut out of the background
automatically, I love that.? It isn't always able to but the R-4A photo worked pretty well.
73,
Gary
WB6OGD
On 03/29/2023 12:33 AM Doug Crompton WA3DSP <wa3dsp@...> wrote:
Gary,
?Great photos and great looking twins. It is hard to get clear lighted dial and front panel photos. Any secrets?
?
Doug, WA3DSP
|
How does one re-tune a TR4Cw when moving to a new frequency? ?
There are a lot of videos and documents on tuning a TR4Cw on a specific frequency, but I have not seen any instructions on how to touch up the tuning when going from say 7.160 MHz to 7.258 MHz. ?
I finally have my TR4Cw on-line and can tune it up on a frequency, but:?
* ? ?How do I tell when I've moved too far from the initial frequency and need to retune?
* ? ?How do I touch up the tuning? ?Certainly there has to be a better way than to start from scratch and tune up on the new frequency.
Thanks,
Bill
KA4GAV
|
Re: For Sale Beautiful 4A Line Sacramento, CA
Yeah, it's funny like that.? I just added a 7.5' long desk to fit more rigs.? A friend of mine gave me a Collins S Line that was non-functional and I have got them all working.? I also still have an 11-tube R-4A from that haul that needs an Oak switch and two TenTecs that need work (an Omni V and Omni VI).? Some of the money I'll make will just go into more electronic toys but my Triumph is starting to syphon some of the money (and time).? My goal this year for that is to get the new top installed and? get and install a new interior for it. (that's my "other" TR6).
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Tuesday, March 28th, 2023 at 7:58 PM, wb6ogd <garywinblad@...> wrote:
hi hi, I know how that goes, I am trying toget rid of stuff so I can even find the other stuff! Gary On Mar 28, 2023, at 4:28 PM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
? I was getting a little tingle. ?I was reading the file you uploaded and, ¡°Hmmm¡ that board looks familiar!¡±??I have the board but had forgotten what it was for. I¡¯ll unearth it and find the parts. Too many ±Ê°ù´ÇÂá±ð³¦³Ù²õ¡
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Tue, Mar 28, 2023 at 18:19, wb6ogd < garywinblad@...> wrote: My records say I sent you a pcb.
Just after I made the Sherwood boards, another guy was selling completed ones on ebay but I don't see he's still there.
73,
Gary
WB6OGD
?
|
Re: For Sale Beautiful 4A Line Sacramento, CA
Gary,
?Great photos and great looking twins. It is hard to get clear lighted dial and front panel photos. Any secrets?
?
Doug, WA3DSP
|
Re: For Sale Beautiful 4A Line Sacramento, CA
hi hi, I know how that goes, I am trying to get rid of stuff so I can even find the other stuff! Gary
toggle quoted message
Show quoted text
On Mar 28, 2023, at 4:28 PM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
? I was getting a little tingle. ?I was reading the file you uploaded and, ¡°Hmmm¡ that board looks familiar!¡±??I have the board but had forgotten what it was for. I¡¯ll unearth it and find the parts. Too many ±Ê°ù´ÇÂá±ð³¦³Ù²õ¡
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Tue, Mar 28, 2023 at 18:19, wb6ogd < garywinblad@...> wrote: My records say I sent you a pcb.
Just after I made the Sherwood boards, another guy was selling completed ones on ebay but I don't see he's still there.
73,
Gary
WB6OGD
?
|
Re: For Sale Beautiful 4A Line Sacramento, CA
I was getting a little tingle. ?I was reading the file you uploaded and, ¡°Hmmm¡ that board looks familiar!¡±??I have the board but had forgotten what it was for. I¡¯ll unearth it and find the parts. Too many ±Ê°ù´ÇÂá±ð³¦³Ù²õ¡
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Tue, Mar 28, 2023 at 18:19, wb6ogd < garywinblad@...> wrote: My records say I sent you a pcb.
Just after I made the Sherwood boards, another guy was selling completed ones on ebay but I don't see he's still there.
73,
Gary
WB6OGD
?
|
Re: Problem with carrier balance pot on T-4XC
I just tried on an old T-4X here..? there doesn't appear to be any stops.? Just turn it back the other way.
73,
Gary
WB6OGD
?
|
Re: For Sale Beautiful 4A Line Sacramento, CA
My records say I sent you a pcb.
Just after I made the Sherwood boards, another guy was selling completed ones on ebay but I don't see he's still there.
73,
Gary
WB6OGD
?
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Re: Problem with carrier balance pot on T-4XC
Ok. It makes sense now. Given that nothing appears to be broken, any suggestions on how I can get enough preload on the bearings so that they will turn the armature?
--
Bill N0CU
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Skip
Gary WB6OGD
Bill Turini
Doug Crompton WA3DSP