The PHILCO Phorum
RP-1 connected to pilot FM tuner - Printable Version

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RP-1 connected to pilot FM tuner - Howard R Stricklin - 12-07-2010

Would it be it possible to connect the two together ?

Re: RP-1 connected to pilot FM tuner - Ron Ramirez - 12-07-2010

Short answer - no.

The RP-1 produces an AM signal in the neighborhood of 550 kc (it is adjustable, but will remain in the lower end of the AM band), which cannot be received on an FM tuner.

Re: RP-1 connected to pilot FM tuner - Howard R Stricklin - 12-07-2010

I was thinking along the lines of the outputs on the pilot tuner (6 and 7) to the cartridge wires on the RP-1.. i have an i pod with head phone booster jacked to it then to the RP-1 and my 40-180 gets a good strong sig .......I don't want to receive the signal from the RP-1 i want to send to it ...the pilot tuner is a t601 and has a jack that came with it that would attach to the phono input of radios that had one factory installed..
I have 2 RP-1s one you have to tune the radio to 1400 kc range to pick up the signal from the RP-1 ...
I discovered that when i thought the RP-1 (that i had just got) was not working until i tuned the dial on my Stromburg Carlson to around that range ...

Re: RP-1 connected to pilot FM tuner - Ron Ramirez - 12-07-2010

Oh, okay, so you want to use the RP-1's AM transmitter to rebroadcast an FM signal via AM. Go ahead and try it, you might - or might not - have a little distortion on the signal depending on the level of the Pilotuner's output.

Re: RP-1 connected to pilot FM tuner - Howard R Stricklin - 12-08-2010

The reason i want to do this is because of my 20 or so radios none have a phono jack
on them ...
There is no other way i can think of to see if it works the (pilot tuner) ...
Id like to hook it up to my 40-180 or one of my other radios but don't have a clue as to how ....the tuner has no instructions on how to do this other then the phono
jack method ...other then that it says you have to take it to a shop and have a repairman do it ... Well there is no such thing as a radio repair shop anymore so im stuck with this method . and mailing it 500 miles or more and a radio plus cost of having it done is out of the question ...

Here is something i found on how to do it but can not make heads or tails as to what they are talking about ....

INSTALLATION PROCEDURE

Attach center wire and outside shield wire of PILOTUNER connector cable to terminals #7 and #6 respectively of the PILOTUNER, following instructions in Par. III of service booklet.

Modify the radio receiver circuit as follows: (See diagram below)

"Unsolder the wire attached to the ungrounded side of the volume control, and attach center wire of PILOTUNER connector cable to this spot. The outside shielded wire of the radio receiver. The disconnected lead from the volume control should be soldered to the center wire of a second connector cable, and through it connected to terminal #5 of the PILOTUNER. The shielded wire of this second cable should also be soldered to chassis. The radio receiver will then operate normally on standard broadcast (AM), whenever the ON-OFF switch of the FM PILOTUNER is in the OFF position."

"It lost me at ungrounded side of the volume control "

Re: RP-1 connected to pilot FM tuner - Ron Ramirez - 12-08-2010

Howard Stricklin Wrote:"It lost me at ungrounded side of the volume control "

Okay. Looking at the back side of a typical volume control, you will see three solder terminals.

The terminal on the left is the grounded end (this terminal goes to B- in AC/DC sets instead of to the chassis).

The middle terminal is the wiper arm of the control.

The terminal on the right is the "high" or "ungrounded" side of the control.

Pretending your Pilotuner is a phono jack, the following link to another Philco Phorum thread (how to connect an Ipod to a Philco radio) will show you how to hook this up:

http://www.philcoradio.com/phorum/showthread.php?tid=2095

Instead of the mini-stereo phone jack, you'll hook your Pilotuner to the volume control. You can install an SPDT switch between the wire normally running to the ungrounded side of the control (which goes to terminal (3) of the jack in the link above) and the new Pilotuner input, with the center of the switch going to the ungrounded end of the volume control. This way, you can switch between radio and Pilotuner operation.

Re: RP-1 connected to pilot FM tuner - gary rabbitt - 12-16-2010

Hi Ron and everyone,
I wasn't aware that the RP-1 had 2 frequency versions. The ones I have broadcast on the low side of the AM band around 540khz.
Has anyone modded your RP-1 Howard?
Tke care,
Gary.

Re: RP-1 connected to pilot FM tuner - Howard R Stricklin - 12-18-2010

I looks all original and i haven't recapped it yet .....Id assume thats whats been done as iv been unable to find any info on rp-1s using the high end of the dial .

Re: RP-1 connected to pilot FM tuner - Ron Ramirez - 12-21-2010

I've never heard of any RP models that broadcast on the high end of the AM band. But then again, Philco has sprung a number of surprises on us over the years.

Maybe sometime I will sit down and go through my RMS Year Books and see what they say about the frequencies used in the various RP models, and see if I missed anything.

Re: RP-1 connected to pilot FM tuner - Chuck Schwark - 12-21-2010

Just saw your comment Ron on the RMS Yearbooks and RP models and happend to have
one out in my hands and pulled the others from the shelf. Here you go.

Looks like the first model introduced was tuned to 1500 kc. but subsequent models and years were
designed for the low end of the AM band.

Chuck
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Taken from the 1939, 1940, and 1941 Philco RMS Yearbooks.
Philco "RP" wireless broadcasting record players:
Frequency ranges in kHz (KC)

1939
RP-1, Code 121 - 1500
RP-1, Code 122 - 540-580
RP-2 - 540-580
RP-3 - 530-580

1940
RP-1, Code 123 - 530-580

1941
41-RP-1 - 530-580
41-RP-2 - 530-580
41-RP-5 - 530-580
41-RP-6 - 530-570
41-RP-15 - 520-850

Re: RP-1 connected to pilot FM tuner - Ron Ramirez - 12-21-2010

Well...there...you...go. Icon_smile

Thanks for looking, Chuck! I was frankly too lazy to go get my RMS books out. So now we know the rest of the story.